CN1301419C - Multi-laser beam combining apparatus - Google Patents

Abstract

The present invention relates to a multiple laser beam recombiner which comprises a plurality of lasers, at least three diaphragms and a receiver, wherein light beams of lambda 1, lambda 2, lambda 3 and lambda 4 emitted from the lasers are arranged in sequence in size; the first diaphragm transmits the light beam of lambda 1, and reflects the light beam of lambda 3; the second diaphragm transmits the light beam with a wavelength of lambda 4, and reflects the light beam with the wavelength of lambda 2; the third diaphragm half transmits and half reflects the light beams with the wavelengths of lambda 1, lambda 2, lambda 3 and lambda 4; the receiver receives the light beams with the wavelengths of lambda 1, lambda 2, lambda 3 and lambda 4. Because the present invention combines lasers with great differences in wavelength values together through the diaphragms, four paths in the prior art are converted into two paths which are then photosynthesized together by the half transmission and half reflection third diaphragm. The present invention has the advantages of the reduction of the process difficulty of the diaphragms, the improvement of the manufacture yield of the diaphragms, consequently the reduction of cost, insensitivity for angles of the diaphragms and benefit for the package of elements.

Description

Many laser beam composite apparatus

Technical field

The present invention relates to a kind of components and parts of optical communication, and particularly the light beam that a plurality of laser instruments are produced carries out compound device.

Background technology

Demand along with the optical communication technology field, the set composite of many laser beams can be combined with each other a plurality of laser instrument emitted light beams and transmit, this recombiner is not simple that the laser instrument emitted light beams is compound, this recombiner is in composite light beam, and the light beam that needs to keep each laser instrument to produce has consistent luminous power between each wavelength in transmission course.

And prior art realizes transmitting and keeping the requirement of its even luminous power usually by glass modules and plated film, Fig. 1 is the schematic diagram of prior art four laser beam set composites, as shown in Figure 1, the set composite 100 of this four laser beam comprises laser instrument 11,12,13 and 14, one prism 20, and receiver 18.Wherein prism 20 posts diaphragm (optical filter) 21,22,23 at its edge, laser instrument 11 emission λ ₁Light beam L1 enter receiver 18 by diaphragm 23 reflection of prism 20; Laser instrument 12 emission wavelengths are λ ₂The light beam L2 diaphragm 22 that passes prism 20 enter in the prism 20, relend by diaphragm 21 reflections and pass diaphragm 23, receive by receiver 18; The wavelength of laser instrument 13 emissions is λ ₃Light beam L3 enter prism 20, by diaphragm 22,21 reflection, see through rete 23, receive by receiver 18; The wavelength of launching when laser instrument 14 is λ ₄Light beam L4 enter prism 20, pass diaphragm 21,23, receive by receiver 18; The diaphragm 22 required performances that have are that transmission peak wavelength is λ so as can be known ₂Light beam L2, reflection wavelength is λ ₃Light beam L3; The diaphragm 21 required performances that have are that transmission peak wavelength is λ ₄Light beam L4, reflection wavelength is λ ₂Light beam L2 and λ ₃Light beam L3; The diaphragm 23 required performances that have are that reflection wavelength is λ ₁Light beam L1, transmission peak wavelength is λ ₂, λ ₃, λ ₄Light beam L2, L3, L4.

The perfect condition of four laser beam set composites of said structure is: when beam incident angle in the air is 45 ° of incidents, be 28.13 ° (being diaphragm 21,22,23 is the incident angle design parameter with 28.13 all) in the incident angle of cemented surface (rete), to λ ₁, λ ₂, λ ₃, λ ₄Carry out beam split.Because the error of the depth of parallelism of the sum of errors prism 20 of assembling itself all can cause the diaphragm incident angle that change has taken place, when incident angle becomes big, wavelength is to short drift; When incident angle diminishes, wavelength moves to journey by raft down the Yangtze River, makes the curve of spectrum drift of diaphragm 21,22,23 like this, is that example specifies curve of spectrum drift phenomenon with diaphragm 22 below, and when at normal incident angle 28.13, the spectral characteristic of diaphragm 22 is reflection λ ₃, transmission λ ₂Light beam, and two-beam L2, L3 can both reach diaphragm 21 after through the transmission of diaphragm 22 or reflection.If incident angle changes and will cause 22 couples of λ of diaphragm ₂And λ ₃Reflection or transmission simultaneously, thus make light beam L2, and L3 can not synthesize and reaches diaphragm 21, or causes the loss of luminous energy.Fig. 2 is the spectral curve of diaphragm 22, shown in Fig. 2 (a), for diaphragm 22, need synthetic light beam L2 (1300nm) and L3 (1325nm), because the wavelength of L2 (1300nm) and L3 (1325nm) differs very little, separately make the characteristic curve of diaphragm 22 steeper light beam L2 (1300nm) and L3 (1325nm) like this, and cause the coating process difficulty to strengthen; In addition, and for example shown in Fig. 2 (b), when incident angle diminishes 1 ° the time, the about mobile 10nm of spectral signature curve like this, requires the very high assembly precision of assembling and the machining precision of prism.

The problem of such scheme existence is like this:

1. rete index height is unfavorable for making and causes the cost height.

2. owing to adopt rete to be glued at mode on the prism, thereby diaphragm is to incident angle α sensitivity.

3. like this to prism accuracy requirement height, the encapsulation of the worker of prism and diaphragm gummed is relatively more difficult like this.

Summary of the invention

In order to overcome the problems referred to above, the object of the present invention is to provide a kind of cost low, insensitive to incident angle, encapsulate simple many laser beam composite apparatus.

In order to reach as above purpose, the many laser beam composite apparatus of the present invention comprise four laser instruments, three diaphragms and a receiver, and wherein four laser instruments produce light beams of different wavelengths λ successively ₁, λ ₂, λ ₃, λ ₄, light beam λ wherein ₁, λ ₂, λ ₃, λ ₄The wavelength size is docile and obedient the preface arrangement, and wherein the wavelength of primary diaphragm transmission first laser instrument generation is λ ₁Light beam and to reflect the wavelength that the 3rd laser instrument produces be λ ₃Light beam; The wavelength that secondary diaphragm transmission the 4th laser instrument produces is λ ₄Light beam and to reflect the wavelength that second laser instrument produces be λ ₂Light beam; And the tertiary membrane sheet is λ to wavelength ₁, λ ₂, λ ₃, λ ₄, the reflectivity of light beam and the ratio of transmissivity be 1: 1, and receiver to receive wavelength be λ ₁, λ ₂, λ ₃, λ ₄Light beam.

Because the present invention lumps together the laser that wavelength value differs bigger by diaphragm, become two-way by four tunnel of prior art, and is in order to semi-transparent semi-reflecting tertiary membrane sheet that two-way is together photosynthetic then.This structure has following advantage:

1. reduce the technology difficulty of diaphragm, improved the fabrication yield of its diaphragm, thereby reduced cost;

2. diaphragm is insensitive to the angle of light degree;

3. such diaphragm helps the encapsulation of device.

Description of drawings

Below in conjunction with drawings and Examples structure of the present invention and effect are further specified.

Fig. 1 is the fundamental diagram of prior art four laser beam composite apparatus.

Fig. 2 (a), Fig. 2 (b) are the spectral signature curve map of the diaphragm 22 of prior art four laser beam composite apparatus.

Fig. 3 is the index path of a specific embodiment of the many laser beam composite apparatus of the present invention.

Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) are respectively the spectral signature curve map of the set composite diaphragm 15,16,17 of the many laser beams of the present invention.

Fig. 5 is the angular deviation and the wave length shift synoptic diagram of the diaphragm 15,16 of the many laser beam composite apparatus of the present invention.

Embodiment

As shown in Figure 3, the many laser beam composite apparatus of the present invention comprise laser instrument 11,12,13 and 14, diaphragm 15,16,17, and receiver 18, wherein laser instrument 11 emission λ ₁Light beam L1 pass diaphragm 15, relend by diaphragm 17 reflection and enter receiver 18; Laser instrument 13 emission wavelengths are λ ₃Light beam L3 arrive diaphragms 17 by diaphragm 15 reflection, enter receiver 18 by these diaphragm 17 reflections once more; The wavelength of laser instrument 12 emissions is λ ₂Light beam L2 enter diaphragm 17 by diaphragm 16 reflection, pass described diaphragm 17 and enter receiver 18 and receive; The wavelength of laser instrument 14 emissions is λ ₄Light beam L4 pass diaphragm 16,17, receive by receiver 18.

Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are the spectral signature curve of diaphragm 15,16,17 of the present invention, and wherein diaphragm 15 is λ ₁And λ ₃Saturating anti-film, diaphragm 16 is λ ₂And λ ₄The saturating anti-film of S polarization state, and diaphragm 17 is λ ₁, λ ₂, λ ₃, λ ₄Semi-transparent semi-reflecting film.Because 15,16 pairs of wavelength value of diaphragm of the present invention differ λ far away ₁, λ ₃And λ ₂, λ ₄Carry out beam split, shown in Fig. 4 (a), Fig. 4 (b), this diaphragm 15,16 is compared with prior art has more smooth spectral signature curve, has reduced the coating process difficulty like this.

Said structure lumps together two laser (light beam L1 and L3, L2 and L4) of being separated by passage, is transformed into two-way by four the tunnel, and then utilizes the tertiary membrane sheet 17 of semi-transparent semi-reflecting film that two-way is together photosynthetic.

Fig. 5 is the angular deviation and the wave length shift synoptic diagram of the diaphragm 15,16 of the many laser beam composite apparatus of the present invention, as shown in Figure 5, during 1 ° of incident angle deviation, its wavelength about 5.6nm that only drifts about.

As above among the embodiment, its each parameter can for:

L1＝1275.7nm

L2＝1300.2nm

L3＝1324.7nm

L4＝1349.2nm

Diaphragm 15:1275/1325 is the cutoff filter (with laser instrument 11,12, the polarization state of 13,14 generation light beams is corresponding) of S or P polarization;

Diaphragm 16:1300/1350 is the cutoff filter (with laser instrument 11,12, the polarization state of 13,14 generation light beams is corresponding) of S or P polarization;

Diaphragm 17:Ts/Rs=1: 1 cutoff wavelength is 1260-1360nm.

Because the present invention lumps together the wavelength bigger laser of being separated by by same diaphragm, become two-way by four tunnel of prior art, then in order to semi-transparent semi-reflecting tertiary membrane sheet with together photosynthetic.This structure has following advantage:

1. diaphragm 15,16 is compared transitional zone with prior art and is had more smooth spectral signature curve, has reduced the coating process difficulty like this, thereby reduces its cost when improving the fabrication yield of its diaphragm 15,16;

2. 15,16,17 pairs of incident angles of diaphragm are insensitive;

3. such diaphragm 15,16,17 helps the encapsulation of device.

The above person only is most preferred embodiment of the present invention, is not to be used to limit the scope of the invention, and all equivalences of being done according to the present patent application claim change or modify, and are all the present invention and contain.

Claims (2)

1. laser beam composite apparatus more than comprises four laser instruments, three diaphragms and a receiver, and wherein a plurality of laser instruments produce light beams of different wavelengths λ successively ₁, λ ₂, λ ₃, λ ₄, light beam λ wherein ₁, λ ₂, λ ₃, λ ₄The wavelength size is docile and obedient preface and is arranged; Wherein the primary diaphragm transmission peak wavelength is λ ₁Light beam and reflection wavelength is λ ₃Light beam; The secondary diaphragm transmission peak wavelength is λ ₄Light beam and reflection wavelength is λ ₂Light beam, and the tertiary membrane sheet is λ to wavelength ₁, λ ₂, λ ₃, λ ₄The transmissivity of light beam and the ratio of reflectivity be 1: 1; And receiver reception wavelength is λ ₁, λ ₂, λ ₃, λ ₄Light beam.

2. many laser beam composite apparatus as claimed in claim 1 is characterized in that, described primary diaphragm, and secondary diaphragm can be the diaphragm that ends of S or P polarization state.

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