CN102577182A - Optical line terminal and method for processing amplified spontaneous emission by same - Google Patents

Optical line terminal and method for processing amplified spontaneous emission by same Download PDF

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Publication number
CN102577182A
CN102577182A CN201180003491XA CN201180003491A CN102577182A CN 102577182 A CN102577182 A CN 102577182A CN 201180003491X A CN201180003491X A CN 201180003491XA CN 201180003491 A CN201180003491 A CN 201180003491A CN 102577182 A CN102577182 A CN 102577182A
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module
optical
signal detection
spontaneous emission
amplified spontaneous
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CN102577182B (en
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彭桂开
周小平
林华枫
徐之光
钱银博
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks

Abstract

An embodiment of the present invention discloses an optical line terminal comprising an optical power amplifier module, an optical power attenuation module, an optical power attenuating range control module and an optical module, wherein the optical power amplifier module, the optical power attenuation module and the optical module are connected in sequence; an input end of the optical power attenuating range control module is connected with the optical module and an output end of the same is connected with the optical power attenuation module; the optical power attenuation module is used to reduce optical power of amplified spontaneous emission generated by the optical power amplifier module; the optical module is used to convert the amplified spontaneous emission after the attenuation of the optical power attenuation module and output signal detection information; the optical power attenuating range control module is used to receive the signal detection information sent by the optical module and exert real-time control over the attenuating range of the optical power attenuation module. The embodiment of the invention further discloses a method for processing amplified spontaneous emission.

Description

The method of optical line terminal and processing amplified spontaneous emission thereof
Technical field
The present invention relates to passive optical network technique, relate to the method for a kind of optical line terminal and processing amplified spontaneous emission thereof especially.
Background technology
It is to realize EPON (Passive Optical Network, the method that PON) middle fiber lengths zooms out and branching ratio expansion is used always that application OA (Optical Amplifier, image intensifer) enlarges luminous power; Specifically, as shown in Figure 1, optical line terminal (the Optical Line Terminal of prior art through OA being placed on local side; OLT) side enlarges luminous power; Simultaneously, it is passive keeping the ODN (Optical Distribution Network, Optical Distribution Network) among the PON.
As shown in Figure 2; In the up registration process of ONU (Optical Network Unit, optical network unit), SD (the Signal Detect that OLT will rely on optical module to provide; Input) detect up luminous power and reach certain threshold value after; Be that optical module and BCDR (Burst Clock and Data Recovery, burst clock and data recovery) module resets GMAC (Gigabit Media Access Control again; The access control of gigabit medium) carries out the parsing of data, can guarantee that so just the registration of ONU is carried out smoothly.
But OA commonly used can produce amplified spontaneous emission (Amplified Spontaneous Emission when electrifying startup; ASE), when behind the preposition OA of receiver of OLT end, as long as this OA one powers on; At up direction ASE output is just arranged,, will cause the SD false triggering to produce high level when the uplink optical signal from ONU does not come up and the power of ASE when surpassing the SD threshold value; Thereby reset optical module and BCDR ahead of time, cause the BCDR losing lock on the one hand, the decision level of setting up on the other hand neither be reliable; When coming on the real uplink optical signal of ONU, possibly cause GMAC to resolve and mistake occur like this, finally make ONU in official hour, can not receive ONU-ID; Or can not receive EQD (Equalization Delay, isostatic lag), thereby influence the registration of ONU.
Summary of the invention
To the interference ONU normal registration problem that above-mentioned amplified spontaneous emission false triggering SD causes, the embodiment of the invention provides a kind of optical line terminal and has handled the method for amplified spontaneous emission, can solve the problems referred to above, ensures the smooth registration of ONU.
A kind of optical line terminal that the embodiment of the invention provides comprises: the luminous power amplification module; The optical power attenuation module; Optical power attenuation amplitude control module and optical module, wherein, said luminous power amplification module, optical power attenuation module and optical module link to each other successively; The input of said optical power attenuation amplitude control module is connected in said optical module, and output is connected in said optical power attenuation module; Said optical power attenuation module is used to reduce the luminous power by the amplified spontaneous emission of said luminous power amplification module generation; Said optical module is used for converting the signal of telecommunication to and export signal detection information through the amplified spontaneous emission after the said optical power attenuation module decay; Said optical power attenuation amplitude control module is used to receive the signal detection information that said optical module sends, and the attenuation amplitude of said optical power attenuation module is controlled in real time.
A kind of method of handling amplified spontaneous emission that the embodiment of the invention provides comprises: attenuation processing is carried out in amplified spontaneous emission; Opto-electronic conversion is carried out in amplified spontaneous emission after overdamping, export the signal detection information corresponding with said amplified spontaneous emission; According to said signal detection information the attenuation amplitude of adjustable optical attenuator is controlled; Control according to said attenuation amplitude is regulated attenuation amplitude.
The another kind of optical line terminal that the embodiment of the invention provides comprises: luminous power amplification module, optical module, signal detection threshold control module; Said luminous power amplification module links to each other with said optical module, and said signal detection threshold control module links to each other with said optical module; Said optical module is used for input amplified spontaneous emission wherein, that produced by said luminous power amplification module is converted to the signal of telecommunication and exports corresponding signal detection information; Said signal detection threshold control module is used for according to the signal detection information from said optical module output the size of signal detection threshold being controlled.
The method that the another kind that the embodiment of the invention provides is handled amplified spontaneous emission comprises: opto-electronic conversion is carried out in amplified spontaneous emission, the output signal detection information; According to said signal detection information the threshold value of said input is adjusted, exported said signal detection threshold adjustment information; Improve the threshold value of input according to said signal detection threshold adjustment information.
The optical line terminal of the processing amplified spontaneous emission that the embodiment of the invention provides makes its corresponding signal of telecommunication be lower than the threshold value of input with method through the power that reduces amplified spontaneous emission or passes through to improve the threshold value of input; Make its value greater than the corresponding signal of telecommunication of amplified spontaneous emission; Having reached input can be by random triggering; Remove interference for the registration of optical network unit, guaranteed the smooth registration of optical network unit.
Description of drawings
The network architecture diagram that system, method and the optical line terminal of the processing amplified spontaneous emission that provides for the embodiment of the invention shown in Figure 1 is suitable for;
Shown in Figure 2 is the structural representation of optical line terminal side receiver in the EPON;
The structural representation of the system of the processing amplified spontaneous emission that provides for the embodiment of the invention shown in Figure 3;
The flow chart of the method for the processing amplified spontaneous emission that Fig. 4 provides for the embodiment of the invention;
The structural representation of the optical line terminal that Fig. 5 provides for the embodiment of the invention;
A kind of structural representation of handling the system of amplified spontaneous emission that the system based on processing amplified spontaneous emission shown in Figure 3 that Fig. 6 provides for the embodiment of the invention obtains;
The another kind that Fig. 7 provides for the embodiment of the invention is handled the system of amplified spontaneous emission and the network architecture sketch map that optical line terminal is suitable for;
The another kind that Fig. 8 provides for the embodiment of the invention is handled the structural representation of the system of amplified spontaneous emission;
Fig. 9 provide for the embodiment of the invention the third handle the structural representation of the system of amplified spontaneous emission;
The structural representation of the another kind of optical line terminal that Figure 10 provides for the embodiment of the invention;
The 4th kind of structural representation of handling the system of amplified spontaneous emission that Figure 11 provides for the embodiment of the invention;
The another kind that Figure 12 provides for the embodiment of the invention is handled the flow chart of the method for amplified spontaneous emission;
The structural representation of the third optical line terminal that Figure 13 provides for the embodiment of the invention.
Specific embodiment
Influence the problem of ONU normal registration for above-mentioned ASE, the system of the processing amplified spontaneous emission that the embodiment of the invention provides, method and can eliminate the ASE interference that registration causes to ONU guarantee the smooth registration of ONU.
Thereby system, method and the optical line terminal of the processing amplified spontaneous emission that the embodiment of the invention provides may cause the SD false triggering to produce the problem of high level above the threshold value of SD to the luminous power of above-mentioned ASE, have proposed two kinds and have solved thinkings: reduced the luminous power that ASE outputs to optical module on the one hand; Improve the threshold value of SD on the other hand, the phenomenon of ASE false triggering SD generation high level just can be eliminated like this.
Particularly, the system of the processing amplified spontaneous emission that the embodiment of the invention provides increases an adjustable optical attenuator (VOA, Variable Optical Attenuator) between OLT receiver and OA; Before the ONU registration, dynamically increase the pad value of VOA, can not surpass the SD threshold value until the ASE of preposition OA; Therefore, the ASE of preamplifier just can not influence the normal registration of ONU, perhaps before the ONU registration; Dynamically increase optical module SD threshold value; Make the ASE of preamplifier output of OLT be no more than the SD threshold value, when ONU register, just can not have the situation of the ASE false triggering SD signal of preamplifier like this.
The system of the processing amplified spontaneous emission that the embodiment of the invention provides is as shown in Figure 3, and said system comprises adjustable optical attenuator, adjustable optical attenuator controller, optical module.Wherein, said adjustable optical attenuator has first input end mouth, second input port and output port; Said optical module comprises PD (Photo Diode; Photodiode), TIA (TransImpedance Amplifier, trans-impedance amplifier) and LA (Limited Amplifier, limiting amplifier); Wherein, LA has input port, first output port and second output port.In said system; Image intensifer links to each other with adjustable optical attenuator through the first input end mouth of adjustable optical attenuator; The output port of adjustable optical attenuator is connected with PD in the optical module; It is that PD links to each other with TIA that PD in the said optical module, TIA and LA link to each other successively; Trans-impedance amplifier links to each other with the input port of LA, and the input of adjustable optical attenuator controller links to each other with first output port of LA in the said optical module, and the output of adjustable optical attenuator controller links to each other with second input port of adjustable optical attenuator.
Said adjustable optical attenuator is used to reduce the luminous power of the ASE that image intensifer produces;
Said optical module is used for converting the signal of telecommunication to through the ASE after the adjustable optical attenuator decay and exporting SD information and give said adjustable optical attenuator controller.
Said adjustable optical attenuator controller is used to receive the SD information that said optical module is exported, and controls the attenuation amplitude of adjustable optical attenuator in real time;
Wherein, said SD information can be each in high level or the low level.
Said system can be arranged on the OLT of PON, and specifically, said system can be integrated in the receiver of OLT.Before the OLT registration, regulate the attenuation amplitude of adjustable optical attenuator at ONU, the ASE that makes image intensifer produce decays the back less than the SD threshold value through adjustable optical attenuator.Before the ONU registration; If it is high level that the adjustable optical attenuator controller perceives SD information, explain that the ASE of image intensifer generation is excessive, the adjustable optical attenuator controller increases the attenuation amplitude of adjustable optical attenuator; Until SD information is low level; At this moment the ASE that produces of image intensifer can not surpass the SD threshold value after through the adjustable optical attenuator decay, saltus step that can false triggering SD level, thereby the normal registration of assurance ONU.
The system of the processing amplified spontaneous emission that provides based on the foregoing description, the embodiment of the invention provides a kind of method of handling amplified spontaneous emission, and is as shown in Figure 4, and said method comprises:
Step 401 is carried out attenuation processing to ASE;
After OA produced ASE, ASE can get into VOA, and VOA promptly carries out attenuation processing to ASE.
Step 402 is carried out opto-electronic conversion to the ASE after overdamping, exports the SD information corresponding with said ASE;
After ASE gets into optical module; Optical module can carry out opto-electronic conversion to ASE; Value after the ASE opto-electronic conversion can be to the SD information generating influence of output, if the performance number after the ASE process opto-electronic conversion does not reach the threshold value of SD, then the SD information of optical module output is low level; If the performance number after the ASE process opto-electronic conversion is higher than the threshold value of SD, then the SD information of optical module output is high level.
Step 403 according to the SD information that said optical module provides, is controlled the attenuation amplitude of VOA;
If the SD information of optical module output is low level, then the VOA controller need not regulated the attenuation amplitude of VOA; If the SD information of optical module output is high level, then the VOA controller strengthens the amplitude of VOA decay.
Step 404 according to the control of said attenuation amplitude, is regulated attenuation amplitude.
VOA regulates the attenuation amplitude of self according to the control of VOA controller to its attenuation amplitude.
Wherein, said SD information can be each in high level or the low level.
The method of the processing amplified spontaneous emission that the above embodiment of the invention provides; Before the ONU registration, carry out; Promptly after OLT powers on, ONU is not issued the registed authorization window, handle with the amplified spontaneous emission that specially image intensifer is produced, said method is dynamically controlled the attenuation amplitude of VOA through the SD information of utilizing the VOA controller to receive optical module output; Thereby guarantee that ASE can not produce high level by false triggering SD, guarantees that finally ONU can register smoothly.
The system of the processing amplified spontaneous emission that provides based on the foregoing description, the embodiment of the invention also provides a kind of optical line terminal, and is as shown in Figure 5; Said optical line terminal comprises luminous power amplification module 501; Optical power attenuation module 502, optical power attenuation amplitude control module 503, optical module 504; Wherein, Luminous power amplification module 501, optical power attenuation module 502 and optical module 504 link to each other successively, and an end of optical power attenuation amplitude control module 503 is connected in optical power attenuation module 502, and the other end is connected in optical module 504;
Said optical power attenuation module 502 is used to reduce the luminous power by the amplified spontaneous emission of luminous power amplification module 501 generations;
Said optical module 504 is used for converting the signal of telecommunication to and export SD information through the amplified spontaneous emission after said optical power attenuation module 502 decay;
Said optical power attenuation amplitude control module 503 is used to receive the SD information that said optical module 504 sends, and the attenuation amplitude of optical power attenuation module 502 is controlled in real time;
Wherein, said SD information can be each in high level or the low level.
Luminous power amplification module 501 can be image intensifer OA; Optical power attenuation module 502 can be VOA; Optical power attenuation amplitude control module 503 can be the VOA controller, and optical module 504 can comprise photodiode, trans-impedance amplifier and limiting amplifier, and photodiode is connected with trans-impedance amplifier; Trans-impedance amplifier is connected with limiting amplifier; At this moment, optical power attenuation module 502 is connected with photodiode, and the end that optical power attenuation amplitude control module 503 is connected with optical module 504 is connected on the limiting amplifier in the optical module 504.
The optical line terminal that the embodiment of the invention provides utilizes optical power attenuation amplitude control module that the attenuation amplitude of optical power attenuation module is controlled in real time; Guarantee that the amplified spontaneous emission that the luminous power amplification module produces can disorderly not trigger SD, thereby guarantee the normal registration of ONU.
The another kind that the embodiment of the invention provides is handled the system of amplified spontaneous emission, and is as shown in Figure 6.The system similarity of the system of said another kind of processing amplified spontaneous emission and processing amplified spontaneous emission shown in Figure 3; The main distinction is; The processing amplified spontaneous emission system that present embodiment provides need increase an optical band pass filter (Band Pass Filter between adjustable optical attenuator shown in Figure 3 and image intensifer; BPF), the negative influence that the ASE that produces with further elimination image intensifer registers ONU.
Said BPF is between image intensifer and adjustable optical attenuator, and the input of BPF links to each other with image intensifer, and the output of BPF links to each other with the first input end mouth of adjustable optical attenuator, and other structures are identical with the structure of processing amplified spontaneous emission system shown in Figure 3.
Said optical band pass filter; Be used to filter the outer ASE noise of passband; Keep the ASE in the passband, and that the free transmission range of said BPF will be with the uplink optical signal of ONU is Wavelength matched, for example at GPON (Gigabit-capable Passive Optical Network; Gigabit passive optical network) or EPON (Ethernet Passive Optical Network; Ethernet passive optical network) in the system, ONU uplink optical signal wavelength is at 1260nm-1280nm, and then the free transmission range of BPF can be set to 1260nm-1280nm.
The system of the processing amplified spontaneous emission that provides based on the foregoing description; The embodiment of the invention provides second kind of method of handling amplified spontaneous emission; The method of the processing amplified spontaneous emission that present embodiment provides is compared with the method for processing amplified spontaneous emission shown in Figure 4; The main distinction is that before step 401, increasing an independent step " carries out the light belt pass filter to ASE "; Can keep the ASE noise in the passband through ASE is carried out the light belt pass filter earlier, filter the outer ASE noise of passband, thereby reach the purpose of filtering a part of ASE.
The another kind that provides based on the foregoing description is handled the system of amplified spontaneous emission; The embodiment of the invention provides another kind of optical line terminal; The another kind of optical line terminal that present embodiment provides is compared with optical line terminal shown in Figure 5; The main distinction is to have increased light belt pass filter module, and said light belt pass filter module is between luminous power amplification module and optical power attenuation module, and the input of said light belt pass filter module is connected with the luminous power amplification module; The output of said optical band pass filter is connected with the optical power attenuation module, and all the optical line terminal with processing amplified spontaneous emission shown in Figure 5 is identical for other.
Wherein, the free transmission range of said light belt pass filter module will be complementary with the wavelength of ONU uplink optical signal.
The system of the processing amplified spontaneous emission that the embodiment of the invention provides also goes for network architecture 40G wavelength as shown in Figure 7 and piles up among the PON.
For the network architecture as shown in Figure 7; Slight change only need be done by the system of the processing amplified spontaneous emission that the embodiment of the invention provides just can be suitable equally; To planar network architecture shown in Figure 7; Image intensifer in the said system is positioned on the input of demodulation multiplexer, and the adjustable optical attenuator in the said system, optical module and adjustable optical attenuator controller are positioned on the output of demodulation multiplexer, for four outputs of demodulation multiplexer; All have said adjustable optical attenuator, optical module and adjustable optical attenuator controller on each output, total is as shown in Figure 8.Earlier respectively the value of four VOA is regulated settings, pass through the pad value of the feedback regulation VOA of SD level then, so that let value behind the ASE entering optical module less than the threshold value of SD.
The system of the processing amplified spontaneous emission as shown in Figure 8 that provides for the embodiment of the invention, the embodiment of the invention also provides a kind of distortion based on system shown in Figure 8, and is as shown in Figure 9.
The system of the third processing amplified spontaneous emission that the embodiment of the invention provides, as shown in Figure 9, comprise image intensifer, adjustable optical attenuator, adjustable optical attenuator controller, demodulation multiplexer, four optical modules, OR circuit.Wherein, said adjustable optical attenuator has first input end mouth, second input port and output port; Said demodulation multiplexer has an input port, four output ports; Said optical module comprises photodiode, trans-impedance amplifier and limiting amplifier; Said limiting amplifier has input port, first output port and second output port; In the said optical module; Photodiode links to each other with trans-impedance amplifier, and trans-impedance amplifier links to each other with the input port of limiting amplifier; Said OR circuit has four input ports, an output port.Image intensifer links to each other with the first input end mouth of adjustable optical attenuator; The output port of adjustable optical attenuator links to each other with the input port of demodulation multiplexer; Four output ports of demodulation multiplexer respectively with four optical modules in photodiode link to each other; First output of the limiting amplifier in four optical modules respectively with or four inputs of door link to each other; Or the door output link to each other with the input of adjustable optical attenuator controller, the output of adjustable optical attenuator controller links to each other with second input port of adjustable optical attenuator.
Said adjustable optical attenuator is used for the luminous power of the amplified spontaneous emission that the attenuate light amplifier produces;
Said demodulation multiplexer is used for according to wavelength one tunnel amplified spontaneous emission light signal being resolved into four tunnel amplified spontaneous emission light signals;
Said optical module is used for the amplified spontaneous emission light signal is converted to the signal of telecommunication and exports SD information;
Said OR circuit is used for the SD information of said optical module output is carried out exclusive disjunction the result of output exclusive disjunction;
Said adjustable optical attenuator controller is used for the attenuation amplitude according to the operation result control adjustable optical attenuator of OR circuit.
Wherein, above-mentioned SD information is each in high level or the low level.
The system of the processing amplified spontaneous emission as shown in Figure 9 that the embodiment of the invention provides needs only among four SD of the limiting amplifier output in four optical modules, has one to be high level; Then or door output be exactly high level; In this case, or the high level of door output can trigger the attenuation amplitude that the adjustable optical attenuator controller is regulated adjustable optical attenuator, all is low level until the SD of four optical modules outputs; The adjustable optical attenuator controller stops to regulate, and the registration of ONU just can have been carried out smoothly.The above-mentioned system that the third handles amplified spontaneous emission can be integrated in the receiver in the OLT among the 40GPON.
The 40G wavelength that is applicable to that provides based on the embodiment of the invention piles up the system of the processing amplified spontaneous emission of PON, and the embodiment of the invention correspondingly provides the third optical line terminal.
Shown in figure 10, the third optical line terminal that the embodiment of the invention provides comprises luminous power amplification module 1001, optical power attenuation module 1002, demultiplexing module 1003, optical module 1004, logical operation module 1005, optical power attenuation amplitude control module 1006;
Said optical power attenuation module 1002, the luminous power of the amplified spontaneous emission that the said luminous power amplification module 1001 that is used to decay produces;
Said demultiplexing module 1003 is used for one tunnel amplified spontaneous emission light signal is resolved into four road light signals according to wavelength;
Said optical module 1004 is used for converting the signal of telecommunication to and export SD information through the amplified spontaneous emission light signal after 1002 decay of optical power attenuation module;
Said logical operation module 1005 is used for the SD information of optical module 1004 outputs is carried out logical operation;
Said optical power attenuation amplitude control module 1006 is used for the attenuation amplitude according to the operation result control optical power attenuation module 1002 of said logical operation module 1005.
Said luminous power amplification module 1001 can be OA; Said optical power attenuation module 1002 can be VOA; Said demultiplexing module 1003 can be a demodulation multiplexer; Said optical module 1004 can comprise PD, trans-impedance amplifier and LA, and said logical operation module 1005 can be the OR circuit that has four input ports, an output port, and said optical power attenuation amplitude control module 1006 can be the VOA controller.
Wherein, above-mentioned SD information is each in high level or the low level.
Above-mentioned provide for the embodiment of the invention the third handle the system and dress optical line terminal of amplified spontaneous emission; Said system and optical line terminal are employed in the mode of installing adjustable optical attenuator behind the image intensifer; Reduced the power of ASE entering optical module; Make the value of the corresponding signal of telecommunication of ASE be lower than the threshold value of SD, thereby keep it can not trigger high level, guaranteed the smooth registration of ONU.
The 4th kind of system that handles amplified spontaneous emission that the embodiment of the invention provides, shown in figure 11, said system comprises image intensifer, optical module and SD threshold value control circuit.Wherein, Said optical module can comprise photodiode, trans-impedance amplifier and limiting amplifier; Said limiting amplifier has first input end mouth, second input port, first output port and second output port; Photodiode links to each other with trans-impedance amplifier, and trans-impedance amplifier links to each other with the first input end mouth of limiting amplifier.Image intensifer links to each other with photodiode in the said optical module; First output port of limiting amplifier links to each other with the input port of said SD threshold value control circuit in the said optical module, and the output port of said SD threshold value control circuit links to each other with second input port of said limiting amplifier;
Said optical module is used for input amplified spontaneous emission wherein, that produced by said image intensifer is converted to the signal of telecommunication and exports corresponding SD information;
Said SD threshold value control circuit is used for according to the SD information from said optical module output the size of SD threshold value being controlled.
Wherein, above-mentioned SD information is each in high level or the low level.
In said system; Limiting amplifier in the optical module is connected with said SD threshold value control circuit; The SD threshold value of exporting in the optical module constantly feeds back to said SD threshold value control circuit, and when the SD threshold value of optical module output diminished, said SD threshold value control circuit was just exported the threshold value that control signal improves SD; So that the value of ASE corresponding signal of telecommunication when getting into optical module is lower than the SD threshold value, realized the effect that ASE can false triggering SD.
Based on the 4th kind of system that handles amplified spontaneous emission that the foregoing description provides, the embodiment of the invention provides the method for another kind of processing amplified spontaneous emission, and is shown in figure 12, and said method comprises:
Step 1201 is carried out opto-electronic conversion to ASE, output SD information;
Optical module carries out opto-electronic conversion to ASE, if the value after the ASE process opto-electronic conversion is lower than the threshold value of SD, then the SD information of optical module output is low level; If the value after the ASE process opto-electronic conversion is higher than the threshold value of SD, then the SD information of optical module output is high level.
Step 1202 is adjusted the threshold value of SD according to the SD information of optical module output, output SD threshold value adjustment information;
If the SD information of optical module output is low level, then the SD threshold value control circuit does not process; If the SD information of optical module output is high level, then the SD threshold value control circuit need be exported the information that increases the SD threshold value.
Step 1203 improves the threshold value of SD according to the SD threshold value adjustment information of SD threshold value control circuit output.
Wherein, above-mentioned SD information is each in high level or the low level.
The method of the processing amplified spontaneous emission that the above embodiment of the invention provides; Before the ONU registration, carry out; Promptly, OLT ONU is not issued the registed authorization window after powering on; Amplified spontaneous emission specially image intensifer is produced is handled, and said method is exported the information that increases the SD threshold value through the SD threshold value control circuit to the real-time monitoring of the SD information of optical module output, has reached the real-time regulated to the SD threshold value; And then guarantee that ASE can not produce high level by false triggering SD, guarantees that finally ONU can register smoothly.
The 4th kind of system that handles amplified spontaneous emission that provides based on the foregoing description; The embodiment of the invention also provides the 4th kind of optical line terminal, and shown in figure 13, said optical line terminal comprises: luminous power amplification module 1301; Optical module 1302, SD threshold value control module 1303;
Said optical module 1302 is used for input amplified spontaneous emission wherein, that produced by said luminous power amplification module 1301 is converted to the signal of telecommunication and exports corresponding SD information;
Said SD threshold value control module 1303 is used for according to the SD information from said optical module 1302 outputs the size of SD threshold value being controlled.
Wherein, above-mentioned SD information is each in high level or the low level.
The 4th kind of corresponding optical line terminal of system of handling amplified spontaneous emission that the above provides for the embodiment of the invention, through the threshold value of SD threshold value control module raising SD, the phenomenon of avoiding ASE disorderly to trigger SD produces, and guarantees that ONU registers smoothly.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (20)

1. an optical line terminal is characterized in that, comprising: the luminous power amplification module; The optical power attenuation module; Optical power attenuation amplitude control module and optical module, wherein, said luminous power amplification module, optical power attenuation module and optical module link to each other successively; The input of said optical power attenuation amplitude control module is connected in said optical module, and output is connected in said optical power attenuation module;
Said optical power attenuation module is used to reduce the luminous power by the amplified spontaneous emission of said luminous power amplification module generation;
Said optical module is used for converting the signal of telecommunication to and export signal detection information through the amplified spontaneous emission after the said optical power attenuation module decay;
Said optical power attenuation amplitude control module is used to receive the signal detection information that said optical module sends, and the attenuation amplitude of said optical power attenuation module is controlled in real time.
2. optical line terminal as claimed in claim 1, said signal detection information are each in high level or the low level.
3. optical line terminal as claimed in claim 1; It is characterized in that; When the signal detection information of said optical module output was high level, said optical power attenuation amplitude control module strengthened the attenuation amplitude of said optical power attenuation module, is low level until said signal detection information.
4. optical line terminal as claimed in claim 1; It is characterized in that; Said optical line terminal can also comprise light belt pass filter module; Said light belt pass filter module is between luminous power amplification module and optical power attenuation module, and the input of said light belt pass filter module is connected with the luminous power amplification module, and the output of said optical band pass filter is connected with the optical power attenuation module;
The free transmission range of said light belt pass filter module and the wavelength of optical network unit uplink optical signal are complementary.
5. optical line terminal as claimed in claim 1; It is characterized in that; Said luminous power amplification module is an image intensifer; Said optical power attenuation module is an adjustable optical attenuator, and said optical module comprises photodiode, trans-impedance amplifier and limiting amplifier, and said optical power attenuation amplitude control module is the adjustable optical attenuator controller.
6. optical line terminal as claimed in claim 4, said light belt pass filter module is an optical band pass filter.
7. optical line terminal as claimed in claim 1 is characterized in that, when said optical line terminal was applied to 40 gigabit wavelength and piles up in the EPON, said optical line terminal also comprised demultiplexing module and logical operation module;
Said luminous power amplification module links to each other with said optical power attenuation module; Said optical power attenuation module links to each other with said demultiplexing module; Said demultiplexing module links to each other with said optical module; Said optical module links to each other with said logical operation module, and said logical operation module links to each other with said optical power attenuation amplitude control module, and the other end of said optical power attenuation amplitude control module links to each other with said optical power attenuation module;
Said demultiplexing module is used for one tunnel amplified spontaneous emission light signal is resolved into multichannel amplified spontaneous emission light signal according to wavelength;
Said logical operation module is used for the signal detection information of said optical module output is carried out logical operation.
8. optical line terminal as claimed in claim 7; It is characterized in that; When the result of said logical operation module output was high level, said optical power attenuation amplitude control module increased the attenuation amplitude of said optical power attenuation module, was low level until the result said or output of door computing module.
9. optical line terminal as claimed in claim 7 is characterized in that said demultiplexing module is a demodulation multiplexer, and said logical operation module is an OR circuit.
10. a method of handling amplified spontaneous emission is characterized in that, comprising:
Attenuation processing is carried out in amplified spontaneous emission;
Opto-electronic conversion is carried out in amplified spontaneous emission after overdamping, export the signal detection information corresponding with said amplified spontaneous emission;
According to said signal detection information the attenuation amplitude of adjustable optical attenuator is controlled;
Control according to said attenuation amplitude is regulated attenuation amplitude.
11. the method for processing amplified spontaneous emission as claimed in claim 10 is characterized in that, said signal detection information is each in high level or the low level.
12. the method for processing amplified spontaneous emission as claimed in claim 10; It is characterized in that; The said attenuation amplitude of adjustable optical attenuator control according to said signal detection information comprises that when said detection information is high level the attenuation amplitude that increases adjustable optical attenuator is a low level until said signal detection information.
13. the method for processing amplified spontaneous emission as claimed in claim 10 is characterized in that, before amplified spontaneous emission being carried out attenuation processing, can also comprise the light belt pass filter is carried out in amplified spontaneous emission.
14. an optical line terminal is characterized in that, comprising: luminous power amplification module, optical module, signal detection threshold control module;
Said luminous power amplification module links to each other with said optical module, and said signal detection threshold control module links to each other with said optical module;
Said optical module is used for input amplified spontaneous emission wherein, that produced by said luminous power amplification module is converted to the signal of telecommunication and exports corresponding signal detection information;
Said signal detection threshold control module is used for according to the signal detection information from said optical module output the size of signal detection threshold being controlled.
15. optical line terminal as claimed in claim 14 is characterized in that, said signal detection information is each in high level or the low level.
16. optical line terminal as claimed in claim 14; It is characterized in that; When the signal detection information of said optical module output was high level, said signal detection threshold control module increased the threshold value of input, and the signal detection information of exporting until said optical module is a low level.
17. optical line terminal as claimed in claim 14 is characterized in that, said luminous power amplification module is an image intensifer;
Said optical module comprises photodiode, trans-impedance amplifier and limiting amplifier, and wherein, said photodiode is connected with said trans-impedance amplifier, and said trans-impedance amplifier is connected with said limiting amplifier;
Said signal detection threshold control module is the signal detection threshold control circuit.
18. a method of handling amplified spontaneous emission is characterized in that, comprising:
Opto-electronic conversion is carried out in amplified spontaneous emission, the output signal detection information;
According to said signal detection information the threshold value of said input is adjusted, exported said signal detection threshold adjustment information;
Improve the threshold value of input according to said signal detection threshold adjustment information.
19. the method for processing amplified spontaneous emission as claimed in claim 18 is characterized in that, said signal detection information is each in high level or the low level.
20. optical line terminal as claimed in claim 19 is characterized in that, when the signal detection information of said output was high level, output increased the information of said signal detection threshold, was low level until the signal detection information of said output.
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