CN201425666Y - Differential raster space optical bridge - Google Patents
Differential raster space optical bridge Download PDFInfo
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- CN201425666Y CN201425666Y CN2009201407698U CN200920140769U CN201425666Y CN 201425666 Y CN201425666 Y CN 201425666Y CN 2009201407698 U CN2009201407698 U CN 2009201407698U CN 200920140769 U CN200920140769 U CN 200920140769U CN 201425666 Y CN201425666 Y CN 201425666Y
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Abstract
The utility model discloses a differential raster space optical bridge, which employs differential raster to conduct space coupling of signal laser light beam and local oscillation laser light beam and generates phase displacement output so as to realize a 2*2 90-degree and 180-degree space optical bridge and a 2*4 90-degree space optical bridge. The 2*2 90-degree and 180-degree space optical bridge consists of only one block of differential raster, and the 2*4 90-degree space optical bridge consists of differential raster, a collimation lens and a polarization beam splitter. The differentialraster space optical bridge has the advantages of small volume, simple structure, easy miniaturization integration, oblique light beam incidence use and adaptability to coherent detection and communication systems of free space bridge connection. Compared with conventional 2*2 90-degree optical bridges, the differential raster space optical bridge has no need of losing 50% energy.
Description
Technical field
The utility model relates to coherent detection, coherent laser communication and laser radar field, it specifically is a kind of differential grating space optical bridge, utilize differential grating space optical bridge, in the photoreceiver of coherent detection, be used for space compound laser signal light beam and local oscillation laser beam, and produce as required 90 the degree, 180 degree phase shift outputs, 2 of implementation space * 2 90 degree, 2 * 2 180 degree and 2 * 4 90 degree light bridges.
Background technology
Coherent detection technology is compared with the direct detection technology that generally adopts at present, highly sensitive one more than the magnitude of its receiver, be to realize that high sensitivity receives, improve the effective ways of message transmission rate and reduction volume, quality and power consumption, adopt the photoreceiver of coherent detection system that homodyne and two kinds of receive modes of heterodyne are arranged, but no matter be which kind of mode, before surveying, all 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.According to the type that produces phase shift, the optics bridge is divided into 90 °, 180 ° two kinds, and wherein 180 ° of phase shift bridges are used for balance phase-locked loop receiver, and 90 ° of phase shift bridges are used for costas phase lock loop road receiver.Quantity according to the input-output port is divided into 2 * 2, different types such as 2 * 4.Can divide waveguide, optical fiber coupled mode and free space mode of propagation according to the complex method of signal laser and local oscillator laser, existing light bridge all is at the waveguide and the optical fibre device of the system development of ground light fiber communication mostly, does not belong to the Free Space Optics bridge.In the free space optical bridge joint, first technology [1], [2] (referring to 180 ° of Hybrids for of 90 ° of and of document 1:WalterR.leeb.Realization of Optical Frequencies[C].
Band 37[1983], Heft 5/6:203-206. document 2:R.Garreis, C.Zeiss, " 90 ° of optical hybrid for coherent receivers; " Proc.SPIE, Vol.1522, pp.210-219,1991.) adopt wave plate to propose to realize that in conjunction with the polarized light interference principle 2 * 2 space light bridge schemes of 90 degree and 180 degree phase shifts, 2 in document have proposed the implementation of 2 * 4 90 degree phase shifts on this basis, but this scheme exists whole optical system need guarantee that the strict aplanatism of light beam transmits, related elements is too much, not easy of integration and can not be wide the shortcoming used of spectrum.In the document [1] 2 * 290 degree space light bridge also has the shortcoming that must lose 50% energy.Elder generation's technology [3], and [4] (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, patent of invention, 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, patent of invention, notification number: 100383571, utility model patent notification number 2899300 of the same name) birefringence effect of comprehensive utilization crystal and electrooptical effect have proposed 2 * 490 other degree space light bridge schemes, though solved first technology [1], [2] related elements is too much, shortcoming not easy of integration, but this technical scheme requires height to the cutting accuracy of crystal, needs the strict guarantee optical axis of crystal, angular relationship between the linearly polarized light of principal section of crystal and input, otherwise influence coherent reception efficient, in addition, this technical scheme also has the shortcoming that can not use the incident of skew ray bundle.
The utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of and utilizes differential grating to carry out the coupling of flashlight and local oscillator light and produce the differential grating space optical bridge of required phase shift.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of differential grating space optical bridge, it comprises that 90 of 2 * 2 90 degree and 180 degree space light bridges and 2 * 4 spend space light bridges; Described 2 * 2 90 degree and 180 degree space light bridges only are made of a differential grating (01); Described 2 * 4 90 degree space light bridges, by differential grating (01), collimation lens (06), polarization beam apparatus (07) and (08) component constitute, the position relation of each component is: the direct of travel along light is differential grating (01) successively, collimation lens (06), polarization beam apparatus (07) and (08).
It is that differential grating (01) is to have two identical periodicity space structures of the cycle of staggering mutually on a grating that above-mentioned 2 * 2 90 degree and 180 are spent space light bridges, this structure has two kinds: structure one is that two zones that area is identical that are divided into two are arranged on the grating, and it is f that spatial frequency is carved with in one of them zone
cPeriodic structure, it is the parallel same space periodic structure that moves a slight distance Δ of baseline that another zone is carved with first regional cutting center line, its Δ＜1/f
c, for 2 * 2 90 degree space light bridges, differential amount is
For 2 * 2 180 degree space light bridges, differential amount is
Structure two is that two parallel periodicity space structures that stagger are arranged on the grating, and identical cutting center line is at a distance of a slight distance Δ, Δ＜1/f
c, for 2 * 2 90 degree bridges, distance is
For 2 * 2 180 degree bridges, distance is
The structure of the differential grating (01) of above-mentioned 2 * 4 90 degree differential grating space optical bridges is identical with 2 * 2 90 degree bridges, and it is positioned at the front focal plane of collimation lens (06).
Polarization beam apparatus (07) and (08) of above-mentioned 2 * 4 90 degree differential grating space optical bridges are that incident light is divided into the orthogonal aplanatic beam splitter of light vector direction of vibration, angle between the light vector direction of vibration of one of them linearly polarized light of its principal section and incident such as flashlight (02) or local oscillator light (03) is 45 degree, its plane of incidence vertical incidence radiation direction; The parallel placement of aliging of polarization beam apparatus (07) and (08) two plane of incidence.
The utility model beneficial effect compared with the prior art is:
The utility model differential grating space optical bridge utilizes differential grating to carry out the coupling of flashlight and local oscillator light and produces required phase shift, little except that having volume, in light weight, simple in structure, can be wide spectrum use and the characteristics of skew ray bundle incident use outside, compare with 2 * 2 90 traditional degree space light bridges, have the advantage that to lose 50% energy especially.Be applicable to coherent detection and communication system that free space is propagated.
Description of drawings
Fig. 1 is the utility model differential grating space optical bridge structural representation.
Fig. 2 is 2 * 2 differential grating 90 degree and 180 degree space light bridge structural representations
Fig. 3 is 2 * 4 differential grating 90 degree space light bridge structural representations.
Embodiment
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing, but should not limit protection domain of the present utility model with this.
Fig. 1, Fig. 2 and Fig. 3 are the utility model differential grating space optical bridge structural representations.As seen from the figure, described in the utility model 2 * 2 90 degree and 180 degree space light bridges are differential gratings, and its structural representation as shown in Figure 2.The architectural feature of differential grating is the periodicity space structure that two same period are arranged on the grating.Two kinds of method for makings are arranged, as Fig. 1 (a), (b) shown in.Structure one: a grating is divided into two identical zones of area, engraves the grating that grating constant is d on the zone therein earlier, spatial frequency is f
c=1/d is baseline in another zone with first cutting center line then moves a slight distance Δ (Δ＜1/f toward the x direction
c) carve the grating of a same period again, wherein differential amount Δ is by required phase-shift phase decision, and for 2 * 2 90 degree bridges, differential amount is by equation
Determine that for 2 * 2 180 degree bridges, differential amount is by equation
Determine.Structure two: subregion not on the grating, on grating, carve the grating that grating constant is d earlier, be that baseline moves a slight distance Δ (Δ＜1/f toward the x direction with first cutting center line then
c) carve the grating of a same period again.For 2 * 2 90 degree bridges, differential amount is
For 2 * 2 180 degree bridges, differential amount is
The space periodic of appropriate design differential grating make it have only 0 grade and 1 grade of two bundle diffraction light, and 0 grade of diffraction intensity with 1 grade is identical, and like this, 2 * 2 90 degree and the light bridge of 180 degree just only are made of a differential grating.
Collimation lens are placed in the back of 90 degree differential gratings 2 * 2, differential grating is positioned on the focal plane of collimation lens, light beam 04, become collimated light beam behind the 05 process lens 06, behind lens, place two polarization beam apparatus 07 and 08 again, obtain the light beam output of four-way, when the light vector direction of vibration of polarization beam apparatus principal section direction and the linearly polarized light that synthesizes becomes 45 angles, can realize 90 ° of space light bridges of 2 * 4.2 * 4 differential gratings, 90 degree space light bridge structural representations as shown in Figure 3.
In this embodiment, the beam diameter of establishing flashlight and local oscillator light is φ 3mm, and raster size is length x width=6mm * 6mm, grating constant d=1550nm, and 90 and 180 corresponding degree phase shifts, differential amount is respectively:
If be 1064nm with wavelength, the fleet angle of two passage output beams is about 20 degree, in 90 ° of space light bridges of four-way output 2 * 4, the focal length of design lens 06 is 30mm, and two polarization beam apparatus adopt the calcite birefringence optical flat to constitute, and structure is identical, be of a size of length=40mm * 12mm * 10mm, when adopting the maximization separate design, direction of optic axis is 48 degree, and the largest beam irrelevance is
Wherein Δ L is the separating distance of output beam, and D is the length of birefringence optics flat board, makes the light beam along continuous straight runs separately, neighbor distance between the output beam 9 and 10,11 and 12 is 4.4mm, output beam 9,10 and output beam 11,12 between vertical range be 11mm.
Claims (4)
1. a differential grating space optical bridge is characterized in that, it comprises that 90 of 2 * 2 90 degree and 180 degree space light bridges and 2 * 4 spend space light bridges; Described 2 * 2 90 degree and 180 degree space light bridges only are made of a differential grating (01); Described 2 * 4 90 degree space light bridges, by differential grating (01), collimation lens (06), polarization beam apparatus (07) and (08) component constitute, the position relation of each component is: the direct of travel along light is differential grating (01) successively, collimation lens (06), polarization beam apparatus (07) and (08).
2. differential grating space optical bridge according to claim 1, it is characterized in that, described 2 * 2 90 degree are that differential grating (01) is to have two identical periodicity space structures of the cycle of staggering mutually on a grating with 180 degree space light bridges, this structure has two kinds: structure one is that two zones that area is identical that are divided into two are arranged on the grating, and it is f that spatial frequency is carved with in one of them zone
cPeriodic structure, it is the parallel same space periodic structure that moves a slight distance Δ of baseline that another zone is carved with first regional cutting center line, its Δ＜1/f
c, for 2 * 2 90 degree space light bridges, differential amount is
For 2 * 2 180 degree space light bridges, differential amount is
Structure two is that two parallel periodicity space structures that stagger are arranged on the grating, and identical cutting center line is at a distance of a slight distance Δ, Δ＜1/f
c, for 2 * 2 90 degree bridges, distance is
For 2 * 2 180 degree bridges, distance is
3. differential grating space optical bridge according to claim 1, it is characterized in that, described 2 * 4 90 the degree differential grating space optical bridges differential grating (01) structure with 2 * 2 90 the degree bridges identical, it is positioned at the front focal plane of collimation lens (06).
4. differential grating space optical bridge according to claim 1, it is characterized in that, polarization beam apparatus (07) and (08) of described 2 * 4 90 degree differential grating space optical bridges are that incident light is divided into the orthogonal aplanatic beam splitter of light vector direction of vibration, angle between the light vector direction of vibration of one of them linearly polarized light of its principal section and incident such as flashlight (02) or local oscillator light (03) is 45 degree, its plane of incidence vertical incidence radiation direction; The parallel placement of aliging of polarization beam apparatus (07) and (08) two plane of incidence.
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| CN2009201407698U CN201425666Y (en) | 2009-04-24 | 2009-04-24 | Differential raster space optical bridge |
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| CN2009201407698U CN201425666Y (en) | 2009-04-24 | 2009-04-24 | Differential raster space optical bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539661B (en) * | 2009-04-24 | 2010-12-01 | 广西大学 | Differential grating space optical bridge |
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2009
- 2009-04-24 CN CN2009201407698U patent/CN201425666Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539661B (en) * | 2009-04-24 | 2010-12-01 | 广西大学 | Differential grating space optical bridge |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100317 Effective date of abandoning: 20090424 |