CN101726862A - 2*4 grating coupled 90-degree space optical hybrid - Google Patents
2*4 grating coupled 90-degree space optical hybrid Download PDFInfo
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- CN101726862A CN101726862A CN200910114663A CN200910114663A CN101726862A CN 101726862 A CN101726862 A CN 101726862A CN 200910114663 A CN200910114663 A CN 200910114663A CN 200910114663 A CN200910114663 A CN 200910114663A CN 101726862 A CN101726862 A CN 101726862A
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Abstract
The invention discloses a 2*4 grating coupled 90-degree space optical hybrid, which consists of a wave plate, a grating and polarization splitters, wherein the diffraction grating performs space coupling on a signal laser beam and a local oscillation laser beam; and the wave plate is combined with the polarization splitters to generate the required phase shift so as to realize the 2*4 90-degree space optical hybrid. The 2*4 grating coupled 90-degree space optical hybrid has the advantages of small volume, light weight, simple structure, easy realization of phase relation, adjustability and the like, and is suitable for coherent light receiving systems for free space hybrid.
Description
Technical field
The present invention relates to the coherent reception field, specifically is 90 ° of space light bridges of a kind of 2 * 4 gratings coupling.
Background technology
Coherent detection technology is to improve effective means of receiver sensitivity, adopt the photoreceiver of coherent detection system before carrying out acquisition of signal, all to need light bridge that signal laser and local oscillator laser are linked and produce required phase shift output, therefore, light bridge is one of Primary Component in the coherent light detection system, wherein 2 * 4 90 ° of bridges are that application prospect is the most a kind of, the light bridge of exploitation all is waveguide and the optical fibre device at ground light fiber communication system applies mostly at present, but learn in the receiving system space optics bridge that needs free space to propagate at the space using coherent light that needs extract location information.In the free space optical bridge joint, first technology [1], [2] (referring to 180 ° of Hybrids for of 90 ° of and of document 1:Walter R.leeb.Realizationof Optical Frequencies[C].
Band 37[1983], Heft 5/6:203-206. document 2:R.Garreis, C.Zeiss, " 90 ° of opticalhybrid for coherent receivers; " Proc.SPIE, Vol.1522, pp.210-219,1991.) proposed to adopt wave plate to realize that in conjunction with polarization beam apparatus or unpolarized beam splitter 2 * 2 space light bridge schemes of 90 degree and 180 degree phase shifts, document [2] have then proposed the implementation of 2 * 4 90 degree phase shifts on this basis, but this scheme must make two polarized components process polarization beam apparatus of incident beam, phase place behind the unpolarized beam splitter satisfies particular kind of relationship, the technical very difficult realization of this point, in addition, also have whole optical system need guarantee the strict aplanatism transmission of light beam, dress is difficulty, shortcomings such as related elements is too much, and is not easy of integration.Elder generation's technology [3], [4], [5], [6], [7] are (referring to document 3: Liu Liren, Liu Dean, Yan Aimin, Luan Zhu, Wang Lijuan, Sun Jianfeng, clockwise is red, electric control phase shift space optical hybrid, and Chinese invention patent, notification number: 100383572, utility model patent notification number of the same name: 200959599; Document 4: Liu Liren, Yan Aimin, Luan Zhu, Liu Dean, Sun Jianfeng, Wang Lijuan, clockwise is red, birefringence free space optical bridge, Chinese invention patent, notification number: 100383571, utility model patent notification number 2899300 of the same name, document 5: Wan Lingyu, Liu Li people, Sun Jianfeng, Zhou Yu, the inferior nanmu of duty, Xu Nan, Yan Aimin, phase-controllable birefringence space light bridge, Chinese invention patent, application number: 200910051608.6; Document 6: Wan Lingyu, Liu Liren, the inferior nanmu of duty, Zhou Yu, Sun Jianfeng, Xu Nan, Yan Aimin, polarizing beam-splitting birefringence space light bridge, Chinese invention patent, application number: 200910051610.3; Document 7: the inferior nanmu of duty, Zhou Yu, Wan Lingyu, Yan Aimin, Sun Jianfeng, Liu Liren, Xu Nan, Wang Lijuan, electric-control phase-shift crystal birefringence space light bridge, Chinese invention patent, application number: 200910050593.1) comprehensive utilization birefringence effect of crystal and electrooptical effect have proposed other several 2 * 4 90 degree space light bridge schemes, but input beam was separated by too closely when these space light bridges all had incident, was difficult to accurately control, the shortcoming that the light beam input mode is strict.Elder generation's technology [8], and [9] (referring to document 8: Wan Lingyu, Zhang Weiping, Su Shida, Gu Wei, Ban Weihua, space light bridge with precise grating adjustment, Chinese invention patent, application number: 200910113988.1; Document 9: Wan Lingyu, Ban Weihua, Gu Wei, Su Shida, differential grating space optical bridge, Chinese invention patent, application number: 200910114008.X) proposed to utilize grating to set up the scheme of space light bridge, but optical grating element is too many in the document [8], the diffraction efficiency of multiple beam is difficult for improving, influence coupling detection efficiency is not adjusted the phase deviation that measure causes with the making error of compensates for differential grating and provide respective phase in the document [9].
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, provide a kind of grating that utilizes that flashlight and local oscillator light are coupled, wave plate produces required phase shift in conjunction with polarization beam apparatus, and can come phase place is adjusted 90 ° of space light bridges of 2 * 4 gratings coupling of compensation by the optical axis direction of rotating wave plate.
The technical scheme that the present invention solves the art technical matters is as follows:
90 ° of space light bridges of a kind of 2 * 4 gratings coupling, characteristics are the flashlight of two passages input and the branch combiner that local oscillator light process grating diffration is realized flashlight and local oscillator light, and wave plate produces phase shift in conjunction with the relative 90 ° of phase relations between the light beam of polarization beam apparatus realization four-way output.
90 ° of space light bridges of a kind of 2 * 4 gratings coupling, it is by quarter-wave plate 4 or the 1/1st wave plate 5 and the 1/2nd wave plate 6, grating 1, first polarization beam apparatus 2 and second polarization beam apparatus, 3 formations, and the position relation of above-mentioned each component is: the direct of travel along light is described quarter-wave plate 4 or 1/8th wave plates 5 or 1/8th wave plates 6, grating 1 and polarization beam apparatus 2 successively.
Above-mentioned quarter-wave plate 4, the 1/1st wave plate 5 wave plates and the 1/2nd wave plate 6 its fast axles or slow axis can be that axle rotates its incidence surface vertical incidence radiation direction with the incident ray.
Above-mentioned polarization beam apparatus 2 is that incident light is divided into the orthogonal aplanatic beam splitter of direction of vibration, and the angle of the linearly polarized light direction of vibration of its main shaft and incident is 45 degree, its incidence surface vertical incidence radiation direction.
The present invention's advantage compared with the prior art is:
90 ° of space light bridges of a kind of 2 * 4 gratings coupling of the present invention utilize the grating diffration characteristic that flashlight and local oscillator light are carried out the branch combiner, wave plate makes the light of two vertical polarization components produce certain phase difference, polarization beam apparatus is with the beam separation of identical polarization state, the phase shift that comprehensive wave plate produces can realize 90 ° of space light bridges of four-way output, the rotation of wave plate optical axis direction can also compensate because the phase deviation that processing and rigging error cause, therefore, it is little that the present invention has a volume, in light weight, simple in structure, easy to use, phase relation easily realizes and adjustable advantage.Be applicable to the coherent light receiving system of free space bridge joint.
Description of drawings
Fig. 1 is 90 ° of space light bridge structure one synoptic diagram of a kind of 2 * 4 gratings coupling.
Fig. 2 is 90 ° of space light bridge structure two synoptic diagram of a kind of 2 * 4 gratings coupling.
Among the figure: grating 1, the first polarization beam apparatus 2, the second polarization beam apparatus 3, quarter-wave plate 4, the one 1/8th wave plates 5, the 2 1/8th wave plates 6.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.But should not limit protection scope of the present invention with this.
Two kinds of structures of 90 ° of space light bridges of a kind of 2 * 4 gratings of the present invention coupling such as Fig. 1, shown in Figure 2.Structure one shown in Figure 1 comprises: quarter-wave plate 4, grating 1, polarization beam apparatus 2 and polarization beam apparatus 3, structure two shown in Figure 2 comprises: the 1/1st wave plate 5, the 2 1/8th wave plates 6, grating 1, polarization beam apparatus 2 and polarization beam apparatus 3, wherein: a is the flashlight of input, and b is the local oscillator light of input, and four road light beams of output are respectively light beam A, light beam B, light beam C and light beam D.Grating 1 reasonable in design makes it have only first-order diffraction light in the incident angle that uses, and concrete grating constant can be definite by following grating equation,
d?sin(θ
0+θ)＝kλ (1)
In the formula (1), θ
0Be respectively incident angle and angle of diffraction with θ, k is the order of diffraction, and λ is the use wavelength, among the present invention, and the k=1 here.
In structure shown in Figure 1, flashlight a is earlier through quarter-wave plate, then with local oscillator light b respectively with identical incident angle along grating 1 symmetrical incident, become synthetic light beam c and d through grating diffration, wherein synthetic light beam c is made up of 0 grade of local oscillator light and+1 grade of flashlight, synthetic light beam d is made up of-1 grade of local oscillator light and 0 grade of flashlight, and synthetic signal/local beam c, d is divided into polarization state identical four bundles synthetic light A, B, C, D by the polarization beam apparatus 2 of back and polarization beam apparatus respectively.When the flashlight and the local oscillator light of incident all is linearly polarized light, and the main shaft of the direction of vibration of its light vector and polarization beam apparatus can be realized 90 ° of space light bridges of 2 * 4 when becoming miter angle.In structure shown in Figure 2 two, flashlight a and local oscillator light b be earlier through one 1/8th wave plate, then with identical incident angle along grating 1 symmetrical incident, other with structure one in identical.
In this embodiment, if the beam diameter of flashlight and local oscillator light is φ 3mm, use wavelength to be 1064nm, design incident uses angle and angle of diffraction all to be 45 °, calculate the grating constant 1064nm of the grating of need making 1 according to formula (1), design size is length x width=10mm * 6mm, in the structure one, four/wave plate 4 is of a size of length x width=6mm * 6mm, and polarization beam apparatus 2 and polarization beam apparatus 3 are of a size of length=6mm * 6mm * 6mm.In the structure two, 1/8th wave plates 5 are identical with the dimensional structure of 1/8th wave plates 6, all are length x width=6mm * 6mm.Four/wave plate 4,1/8th wave plates 5 and 1/8th wave plates 6 can rotate for axle by incident ray, when because rigging error when making 90 ° of phase relations between the output beam deviation occur, the optical axis direction of rotatable four/wave plate 4 is adjusted in the structure one, can rotate the optical axis direction of 1/8th wave plates 5 and 1/8th wave plates 6 in the structure two respectively and adjust.
Claims (3)
1. 90 ° of space light bridges of grating coupling, it is characterized in that, it is by quarter-wave plate (4) or the 1/1st wave plate (5) and the 1/2nd wave plate (6), grating (1), first polarization beam apparatus (2) and second polarization beam apparatus (3) formation, and the position relation of above-mentioned each component is: the direct of travel along light is described quarter-wave plate (4) or 1/8th wave plates (5) or 1/8th wave plates (6), grating (1) and polarization beam apparatus (2) successively.
2. 90 ° of space light bridges of a kind of 2 * 4 gratings coupling according to claim 1, it is characterized in that, its fast axle of described quarter-wave plate (4), the 1/1st wave plate (5) wave plate and the 1/2nd wave plate (6) or slow axis can be that axle rotates its incidence surface vertical incidence radiation direction with the incident ray.
3. 90 ° of space light bridges of a kind of 2 * 4 gratings coupling according to claim 1, it is characterized in that, described polarization beam apparatus (2) is that incident light is divided into the orthogonal aplanatic beam splitter of direction of vibration, the angle of the linearly polarized light direction of vibration of its main shaft and incident is 45 degree, its incidence surface vertical incidence radiation direction.
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| CN200910114663A CN101726862A (en) | 2009-12-24 | 2009-12-24 | 2*4 grating coupled 90-degree space optical hybrid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053381A (en) * | 2011-01-20 | 2011-05-11 | 长春理工大学 | Optical mixer for spatial coherent laser communication |
| CN102866510A (en) * | 2012-09-06 | 2013-01-09 | 中国科学院上海光学精密机械研究所 | 2*4 optical bridge for free space |
| CN106680831A (en) * | 2017-01-20 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Laser active coherence balancing detection polarization analyzer |
| CN110244470A (en) * | 2019-05-17 | 2019-09-17 | 西安理工大学 | 90 degree of space light bridges of high-performance crystal-type |
-
2009
- 2009-12-24 CN CN200910114663A patent/CN101726862A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053381A (en) * | 2011-01-20 | 2011-05-11 | 长春理工大学 | Optical mixer for spatial coherent laser communication |
| CN102866510A (en) * | 2012-09-06 | 2013-01-09 | 中国科学院上海光学精密机械研究所 | 2*4 optical bridge for free space |
| CN102866510B (en) * | 2012-09-06 | 2014-08-13 | 中国科学院上海光学精密机械研究所 | 2*4 optical bridge for free space |
| CN106680831A (en) * | 2017-01-20 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Laser active coherence balancing detection polarization analyzer |
| CN106680831B (en) * | 2017-01-20 | 2019-02-26 | 中国科学院上海光学精密机械研究所 | Laser is actively concerned with balance detection polarization analysis instrument |
| CN110244470A (en) * | 2019-05-17 | 2019-09-17 | 西安理工大学 | 90 degree of space light bridges of high-performance crystal-type |
| CN110244470B (en) * | 2019-05-17 | 2021-05-25 | 西安理工大学 | Crystal type 90-degree space optical bridge |
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