CN102842844A - Natural polarization state single wavelength light source and method - Google Patents
Natural polarization state single wavelength light source and method Download PDFInfo
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- CN102842844A CN102842844A CN2012103082432A CN201210308243A CN102842844A CN 102842844 A CN102842844 A CN 102842844A CN 2012103082432 A CN2012103082432 A CN 2012103082432A CN 201210308243 A CN201210308243 A CN 201210308243A CN 102842844 A CN102842844 A CN 102842844A
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Abstract
The invention discloses a natural polarization state single wavelength light source and a method. The light source consists of a first semi-conductor light amplifier with a current pump, a fiber grating and a polarization independent isolator, wherein the fiber grating is connected to one end of the first semi-conductor light amplifier; the reflection wavelength of the fiber grating is in the gain spectrum of the first semi-conductor light amplifier; and the other end of the first semi-conductor light amplifier is connected to the input end of the polarization independent isolator. The method has the following steps that: generating spontaneous radiation by the first semi-conductor light amplifier driven by the current; directly outputting forward spontaneous radiation light through the polarization independent isolator; filtering the backward spontaneous radiation light through the fiber grating and reflecting spontaneous radiation light with narrow-band wavelength; outputting and consuming the spontaneous radiation light of other wavebands from the other end of the fiber grating after the spontaneous radiation light of other wavebands being transmitted; and outputting the spontaneous radiation light reflected by the fiber grating from the polarization independent isolator after being amplified by the first semi-conductor light amplifier again. According to the natural polarization state single wavelength light source and the method, the single wavelength natural polarization light can be directly output, so that the energy conversion efficiency is high; and the natural polarization state single wavelength light source and the method disclosed by the invention are convenient to realize and simple in structure.
Description
Technical field
The present invention relates to optical field, particularly a kind of have nature polarization state, single wavelength light source and a method.
Background technology
Light sources such as common semiconductor laser, fiber laser all have very high linear polarization degree.Light signal is in optical fiber in the transmission course; Because the asymmetry of the inhomogeneities of inevitable small asymmetry, refraction index profile on the fiber core structure, outside or inner lateral stress; And the reversing of optical fiber, electromagnetic field crooked or that add can cause optical fiber to have birefringence effect, thereby cause linearly polarized light to transmit in optical fiber that variation at random all can take place for its polarization direction and degree of polarization behind the segment distance.
[1]In high speed optical fiber communication, Fibre Optical Sensor and fibre optic gyroscope etc. were used, the randomly changing of light signal polarization state can cause and effects such as polarization dispersion, polarization loss, polarization decay requires light source to possess the characteristic of nature polarization state.Therefore the inclined to one side technology of moving back of light source is the main method that solves the polarization relevant issues.
Method commonly used now is with the optical fiber depolarizer polarized light field to be carried out depolarized processing to obtain the nature polarised light, and this method is applicable to broad spectrum light source, and can make light-source structure complicated more.The present invention proposes a kind of optical grating reflection feedback spontaneous radiation light source that utilizes and comes directly to obtain single wavelength light source of nature polarization state, need not the depolarizer of rear end.
Prior art one: use Lyot type depolarizer to carry out depolarized to light field.
Lyot type depolarizer is to differ 45 ° butt joints than the high-birefringence polarisation-maintaining optical fiber of 2:1 with main shaft with two segment length to form.The basic principle of this depolarizer is that the polarization dispersion that these two sections optical fiber are introduced and the difference of these two polarization dispersions all will be much larger than the coherence times of light source.Therefore, this depolarizer is only applicable to use the wideband light source of low temporal coherence.Two inclined to one side conditions are moved back in realization, and the one, emergent light is mapped to two electric field strength on the normal axis and will equates, and the 2nd, guarantee the optical fiber long enough, the delay inequality of electric field Ex, Ey that makes output x, y direction is much larger than coherence time, and the pairwise orthogonal electric field is altogether irrelevant.
[2]
Lyot type depolarizer is more effective to wideband light source, but narrow-band light source is just needed very long high birefringence optical fiber, and so neither compactness is unactual yet.
Prior art two: use cascaded optical fiber annular depolarizer to carry out depolarized to light field.
[2]The single-stage fiber optic loop is to be made by one 2 * 2 directional coupler, and as shown in Figure 1,2 ports of directional coupler are connected with 4 ports and have formed an optical fiber circulating delay line.
Concerning the single-stage fiber optic loop; When input light through after the different circulation light paths, if when satisfying the irrelevant each other and output polarization attitude of its each light beam of output and presenting even distributions, export light and can move back partially; But because the output light component is not a lot; And really play and move back the also few of inclined to one side effect, performance is very unstable, must accurately regulate just to reach the degree of bias of wanting of moving back.Cascade more optical fiber ring; The output beam that has nothing in common with each other to more a large amount of irrelevant each other and polarization state and luminous intensity through the circulation light rood; Just can further satisfy the inclined to one side condition of moving back; Though degree of polarization can reduce rapidly, stability also can further increase, but still has certain probability to produce the output light than high-polarization.As shown in Figure 2:
Single-stage optical fibre delay loop output light field degree of polarization depends on the birefringence parameter of incident light polarization state and delay line, and randomness is very big.Reach the desirable inclined to one side effect of moving back and need more than 8 grades complex structure at least.
Prior art three: optical fiber spontaneous radiation (ASE) light source.
Optical fiber ASE light source is to utilize the spontaneous radiation of gain fibre to amplify as output light.Because spontaneous emission light has the characteristic of polarization direction random distribution, optical fiber ASE light source has very low linear polarization degree.
Optical fiber ASE light source is commonly used to produce high-power smooth wide spectrum output, has after the output of one way forward direction, the one way after output, the output of round trip forward direction, round trip to structures such as output, twin-stage pumpings
[3]Fig. 3 is an one way forward direction export structure sketch:
Pumping source is that gain fibre provides pump light through coupler, produces spontaneous radiation in the gain fibre, and the spontaneous emission light of forward transmitted is exported after through the polarization irrelevant isolator.
Optical fiber ASE light source is a wideband light source, and single wavelength power density is not high, and energy conversion efficiency is low.
Prior art four: super-radiance light emitting diode (SLD/SLED) light source.
Super-radiance light emitting diode (SLD/SLED) is and the similar a kind of semiconductor light source between laser diode and light-emitting diode of semiconductor laser light resource.
SLD is a kind of gain by one path device that spontaneous radiation is amplified.Under forward current injects, the charge carrier generation population inversion in the SQW active area, electronics transits to valence band from conduction band, discharges photon with hole-recombination.The photon of this spontaneous radiation constantly obtains being excited when in cavity, propagating amplifying; But because the reflectivity of two end faces of cavity is all very low; Photon can't form resonant cavity, not have the frequency-selecting effect, so can not produce feedback resonance in the chamber; Be output as incoherent light, have spectral width, high-power characteristics.
[4]
Super-radiance light emitting diode (SLD/SLED) efficient is low, stability is poor, and is low with the coupling efficiency of monomode fiber, and the same with optical fiber ASE light source, has bigger spectral width, is unfavorable in the system of needs list wavelength or narrow spectrum, using.
List of references:
[1]. Liu Li, Zhang Xiaokang. the polarization state of transmitting beam in the optical fiber;
[2]. Zhang Yufei, Wang Chunhua. the statistics of cascaded optical fiber annular depolarizer is moved back inclined to one side analysis;
[3]. Li Li. the smooth Study on Technology of Er-Doped superfluorescent fiber source and spectrum thereof;
[4]. Wang Zhengxuan. super-radiance light emitting diode.
Summary of the invention
The objective of the invention is in order to overcome the deficiency that prior art exists, a kind of natural polarized light source and method of simple in structure and single wavelength is provided, need not any depolarization device.
The present invention adopts following technical scheme for realizing above-mentioned purpose:
A kind of natural polarization list wavelength light source of the present invention; First semiconductor optical amplifier (SOA), fiber grating and polarization irrelevant isolator by the belt current pumping are formed; Fiber grating is connected with an end of first semiconductor optical amplifier, and the reflection wavelength of this fiber grating is in the gain spectral of first semiconductor optical amplifier; The other end of first semiconductor optical amplifier is connected with the input of polarization irrelevant isolator, and semiconductor optical amplifier is that light source provides energy, and the polarization irrelevant isolator guarantees the light field one-way transmission, avoids taking place laser generation.
The output of said polarization irrelevant isolator connects second semiconductor optical amplifier that a belt current drives, as the amplifying stage that is used to improve power.
Said first, second semiconductor optical amplifier can also adopt erbium-doped fiber amplifier to replace.
Said erbium-doped fiber amplifier is made up of semiconductor laser, wavelength division multiplexer and er-doped gain fibre, and semiconductor laser is that wavelength division multiplexer provides pump light, as input pumping light; Wavelength division multiplexer is connected with rear-earth-doped gain fibre.
A kind of improvement project as such scheme: between the said polarization irrelevant isolator and second semiconductor optical amplifier narrow band filter is set, and removes fiber grating.
The method of work of the single wavelength light source of a kind of natural polarization state is following:
First semiconductor optical amplifier produces the spontaneous radiation of broadband, polarization irrelevant under current drives; The forward direction spontaneous emission light is directly exported through polarization independent optical isolator; The back is to the spontaneous emission light of spontaneous emission light through fiber grating filtering reflection narrowband wavelength, and the other end output from fiber grating after the spontaneous radiation transmittance of its all band dissipates; Single wavelength spontaneous emission light by the fiber grating reflection is exaggerated through first semiconductor optical amplifier once more.In this course owing to there is a unidirectional feedback, is extracted from amplifier by the wavelength of grating locking and to be close to whole energy and to be exaggerated, and the light of other wavelength is by significantly inhibition, and kept the characteristic of natural polarization, export from the polarization irrelevant isolator afterwards.
The light source of the output of said polarization irrelevant isolator further amplifies output through second semiconductor optical amplifier.
A kind of improvement project of using arrowband plated film filter of the present invention: between the said polarization irrelevant isolator and second semiconductor optical amplifier narrow band filter is set, and removes fiber grating; Enter into narrow band filter behind the forward direction spontaneous emission light process polarization irrelevant isolator that produces in first semiconductor optical amplifier; The narrowband wavelength of narrow band filter filtering transmission is exaggerated back output in second semiconductor optical amplifier.
Compared with prior art, the present invention and improvement technical scheme thereof have the following advantages:
1. utilize amplified spont-aneous emission among the SOA (ASE) to combine unidirectional feedback arrangement to realize single wavelength nature polarized light source, energy conversion efficiency is high;
2. utilize the ASE characteristics of luminescence directly to obtain the output of nature polarised light, the light source rear end need not add any depolarization device, and it is convenient, simple in structure to realize;
3. adopt among the light reflected back SOA of fiber grating with specific wavelength, because gain competition makes blocked single wavelength obtain higher gain and power, thereby obtains higher Output optical power and narrower spectral width.
Description of drawings
Fig. 1: single-stage fiber optic loop structure chart;
Fig. 2: cascaded optical fiber annular depolarizer structure chart;
Fig. 3: one way optical fiber ASE light source export structure figure;
Fig. 4: the structural representation of the embodiment of the invention 1;
Fig. 5: the structural representation of the embodiment of the invention 2;
Fig. 6: the spectrogram of wideband A SE optical fiber source and the single wavelength light source of this novel natural polarization state;
Fig. 7: the spectral details of new type light source of the present invention;
Fig. 8: the structural representation of the embodiment of the invention 3;
Fig. 9: the structural representation of the embodiment of the invention 4;
Figure 10: the structural representation of the embodiment of the invention 5.
Embodiment
As shown in Figure 4, a kind of single wavelength nature polarized light source of the present invention is made up of semiconductor optical amplifier (SOA) [1], fiber grating [2] and a polarization irrelevant isolator [3] of belt current pumping.
Utilize the characteristic of semiconductor amplifier amplified spontaneous emission (ASE) polarization direction random distribution to produce the nature polarised light; The light reflected back SOA [1] that spontaneous radiation is exported dorsad with fiber grating [2] is to press narrow output spectral width; Utilize its feedback to increase the power of this wavelength simultaneously; Polarization irrelevant isolator [3] prevents that the end face reflection of fiber-optic output from forming laser generation, guarantees the natural polarized light source that output polarization is irrelevant.
One section fiber grating [2] is connected with an end of a semiconductor optical amplifier (SOA) [1], and the reflection wavelength of this fiber grating [2] is in the gain spectral of SOA [1]; The other end of SOA [1] is connected with the input of polarization irrelevant isolator [3].
Semiconductor optical amplifier [1] produces the spontaneous radiation of broadband, polarization irrelevant under current drives; The forward direction spontaneous emission light is directly exported through polarization independent optical isolator [3]; Through fiber grating [2], fiber grating [2] filtering reflection narrowband wavelength dissipates from other end output after the transmittance of its all band to spontaneous emission light in the back; Being passed through SOA [1] once more by the light of fiber grating [2] reflection is exaggerated the back and exports from polarization irrelevant isolator [3].Spontaneous emission light by fiber grating [2] reflection is exaggerated in SOA [1], has not only increased Output optical power but also has suppressed the spontaneous emission light of other wavelength, has pressed spectrum narrow.
As shown in Figure 5, a kind of improved method is to connect semiconductor optical amplifier [4] that a belt current drives realizing higher power output at the output of polarization independent optical isolator [3], and bonding wavelength nature polarization characteristic simultaneously.
Fig. 6 is wideband A SE optical fiber source and the spectrum that does not add the novel natural polarization list wavelength light source of basis of amplifier, and wherein the output bandwidth of ASE optical fiber source is greater than 30nm, and this novel natural polarization list wavelength light source bandwidth is less than 1nm, and power output is 6.0mW.Light by the visible optical fiber optical grating reflection wavelength of figure obtains bigger gain, has also suppressed the light of other wavelength simultaneously.
Fig. 7 is a new type light source output spectrum details of the present invention, can find out the sideband rejection ratio that has greater than 30dB.The reflection spectrum width of fiber grating is less than 1nm, and centre wavelength is 1544nm.
Replace the semiconductor optical amplifier [1,4] in the above technical scheme with erbium-doped fiber amplifier (EDFA) [5,6].With the improvement project is example, its structure such as Fig. 8:
One section fiber grating [2] is connected with an end of an erbium-doped fiber amplifier (EDFA) [5], and the reflection wavelength of this fiber grating [2] is in the gain spectral of EDFA [5]; The other end of EDFA [5] is connected with the input of polarization irrelevant isolator [3]; The output of polarization irrelevant isolator [3] is connected with an EDFA [6].
Wherein EDFA [5,6] is made up of a semiconductor laser [7], a wavelength division multiplexer [8] and one section er-doped gain fibre [9].Its structure such as Fig. 9:
A semiconductor laser [7] provides pump light through wavelength division multiplexer [8], as input pumping light; Wavelength division multiplexer [8] is connected with one section rear-earth-doped gain fibre [9].
The output of polarization irrelevant isolator [3] adds a narrow band filter [10] in improvement project, removes fiber grating [2], its structure such as Figure 10:
A SOA [1] links to each other with the input of a polarization irrelevant isolator [3]; The output of polarization irrelevant isolator [3] is connected with the input of a narrow band filter [10]; The output of narrow band filter [10] is connected with a SOA [4].
Enter into narrow band filter [10] behind the forward direction spontaneous emission light process polarization irrelevant isolator [3] that produces among the SOA [1]; The narrowband wavelength of narrow band filter [10] filtering transmission is exaggerated back output in SOA [4].Above scheme all through the single feedback of fiber grating to the ASE light field, has realized the high power output of single wavelength nature polarization state.
Claims (8)
1. natural polarization list wavelength light source; It is characterized in that: first semiconductor optical amplifier, fiber grating and polarization irrelevant isolator by the belt current pumping are formed; Fiber grating is connected with an end of first semiconductor optical amplifier, and the reflection wavelength of this fiber grating is in the gain spectral of first semiconductor optical amplifier; The other end of first semiconductor optical amplifier is connected with the input of polarization irrelevant isolator.
2. a kind of natural polarization list wavelength light source according to claim 1 is characterized in that: the output of said polarization irrelevant isolator connects second semiconductor optical amplifier that a belt current drives.
3. a kind of natural polarization list wavelength light source according to claim 2, it is characterized in that: said first, second semiconductor optical amplifier can also adopt erbium-doped fiber amplifier.
4. a kind of natural polarization list wavelength light source according to claim 3; It is characterized in that: said erbium-doped fiber amplifier is made up of semiconductor laser, wavelength division multiplexer and er-doped gain fibre, and semiconductor laser provides pump light through wavelength division multiplexer for the er-doped gain fibre; Wavelength division multiplexer is connected with the er-doped gain fibre.
5. a kind of natural polarization list wavelength light source according to claim 2 is characterized in that: between the said polarization irrelevant isolator and second semiconductor optical amplifier narrow band filter is set, and removes fiber grating.
6. the method for work of an a kind of natural polarization list wavelength light source as claimed in claim 1 is characterized in that said method is following:
First semiconductor optical amplifier produces the spontaneous radiation of broadband, polarization irrelevant under current drives; The forward direction spontaneous emission light is directly exported through polarization independent optical isolator; The back is to the spontaneous emission light of spontaneous emission light through fiber grating filtering reflection narrowband wavelength, and the other end output from fiber grating after the spontaneous radiation transmittance of its all band dissipates; Being exaggerated the back through first semiconductor optical amplifier once more by the spontaneous emission light of fiber grating reflection exports from the polarization irrelevant isolator.
7. the method for work of a kind of natural polarization list wavelength light source according to claim 6 is characterized in that the light source of the output of said polarization irrelevant isolator further amplifies output through second semiconductor optical amplifier.
8. the method for work of a kind of natural polarization list wavelength light source according to claim 7 is characterized in that between the said polarization irrelevant isolator and second semiconductor optical amplifier narrow band filter being set, and removes fiber grating; Enter into narrow band filter behind the forward direction spontaneous emission light process polarization irrelevant isolator that produces in first semiconductor optical amplifier; The narrowband wavelength of narrow band filter filtering transmission is exaggerated back output in second semiconductor optical amplifier.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579886A (en) * | 2018-06-07 | 2019-12-17 | 杭州昕磁科技有限公司 | Method and system for branching polarized light and polarization-maintaining transmission |
| CN113375655A (en) * | 2021-05-11 | 2021-09-10 | 北京航天时代光电科技有限公司 | Ultra-low noise wide-spectrum light source for fiber-optic gyroscope based on SOA |
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| CN2596389Y (en) * | 2002-09-30 | 2003-12-31 | 武汉光迅科技有限责任公司 | Wide band ASE light source of new structure |
| CN1490661A (en) * | 2002-10-18 | 2004-04-21 | 三星电子株式会社 | Non-polarizing multiple lambda light source |
| CN1573382A (en) * | 2003-05-20 | 2005-02-02 | 三星电子株式会社 | Wideband optical fiber amplifier |
| US20050105171A1 (en) * | 2003-11-18 | 2005-05-19 | Dong-Jae Shin | Reflective semiconductor optical amplifier light source |
| US7006550B2 (en) * | 2002-09-18 | 2006-02-28 | Orbits Lightwave, Inc. | Traveling-wave lasers with a linear cavity |
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2012
- 2012-08-28 CN CN2012103082432A patent/CN102842844A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7006550B2 (en) * | 2002-09-18 | 2006-02-28 | Orbits Lightwave, Inc. | Traveling-wave lasers with a linear cavity |
| CN2596389Y (en) * | 2002-09-30 | 2003-12-31 | 武汉光迅科技有限责任公司 | Wide band ASE light source of new structure |
| CN1490661A (en) * | 2002-10-18 | 2004-04-21 | 三星电子株式会社 | Non-polarizing multiple lambda light source |
| CN1573382A (en) * | 2003-05-20 | 2005-02-02 | 三星电子株式会社 | Wideband optical fiber amplifier |
| US20050105171A1 (en) * | 2003-11-18 | 2005-05-19 | Dong-Jae Shin | Reflective semiconductor optical amplifier light source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579886A (en) * | 2018-06-07 | 2019-12-17 | 杭州昕磁科技有限公司 | Method and system for branching polarized light and polarization-maintaining transmission |
| CN113375655A (en) * | 2021-05-11 | 2021-09-10 | 北京航天时代光电科技有限公司 | Ultra-low noise wide-spectrum light source for fiber-optic gyroscope based on SOA |
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Application publication date: 20121226 |