CN102495477A - Optical mixer - Google Patents
Optical mixer Download PDFInfo
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- CN102495477A CN102495477A CN2011104026469A CN201110402646A CN102495477A CN 102495477 A CN102495477 A CN 102495477A CN 2011104026469 A CN2011104026469 A CN 2011104026469A CN 201110402646 A CN201110402646 A CN 201110402646A CN 102495477 A CN102495477 A CN 102495477A
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- polaroid
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- wave plates
- optical mixer
- amici prism
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Abstract
The invention belongs to the field of spatial coherent laser communication, and relates to an optical mixer, which consists of polarizing disks (3, 4, 8, 10, 12 and 14), unpolarized beam splitter prisms (5, 7 and 11), lambda/4 wave plates (9 and13) and a lambda/2 wave plate (6), wherein the beam splitting surface of each unpolarized beam splitter prism is plated with a semi-reflective and semi-transparent film; the lambda/4 wave plates are used for generating 90-degree phase shift between signal light and local oscillation light; the lambda/2 wave plate is used for generating 180-degree phase shift between the signal light and the local oscillation light; and after the signal light (1) and the local oscillation light (2) pass through the optical mixer, four paths of coherent light with relative phase differences of 90 degrees can be output. The optical mixer has a compact structure, is simple and practical, and can be applied in the field of free space laser communication coherent reception.
Description
Technical field
The present invention relates to a kind of optical mixer unit, be used to realize exporting four the tunnel and have the coherent light that relative phase difference 90 is spent, belong to the technology of Free-space Laser Communication field.
Background technology
Along with the high speed development of information age, space communtication active demand high speed data transfers.With respect to microwave communication, laser has good communication potential as carrier wave.Coherent detection technology and the direct detection compared with techniques that generally adopts at present in the laser space communication field have highly sensitively, and repeater span is long, and selectivity is good, and message capacity is big, and it is more flexible to have a multiple modulation system application.In order to realize the high code check of high capacity, the satellite borne laser of small light and low-power consumption is communicated by letter at free space, uses the research focus that the coherent detection principle has become free space laser communication.Zero-difference detection BPSK modulation system can obtain the highest detection sensitivity in theory in the coherent detection.Communication receiver is made up of local laser oscillator, photelectric receiver, phase-locked loop, optical mixer unit and flashlight receiving light path.Wherein optical mixer is the key element of coherent optical communication system to optoelectronic receiver with signal laser and local oscillator laser links.Document R.Garreis; C.Zeiss, 90 optical hybrid for coherent receiver, proc.SPIE; The 2x490 degree optical mixer unit that the Vol.1522:210-219 the inside is mentioned; Principle is to adopt linearly polarized light to mix with circular polarization, adopts the combination of polarization splitting prism or polarization splitting prism and unpolarized Amici prism and requires unpolarized Amici prism light splitting surface to producing 90 degree phasic differences between transmitted light and the reflected light, requires very high to actual coating process.The present invention is different with it; The present invention adopts the mutually perpendicular linearly polarized light in polarization direction to mix; And only adopted unpolarized Amici prism; Only require at light splitting surface plating part reflective semitransparent film and realize more easily coating process is less demanding, and the placement of the fast and slow axis of wave plate is also different with it, the principle that phase shift produces is also different.A kind of spatial coherence laser communication is with optical mixer unit (CN 102053381), the said employing in the inside be that two identical linearly polarized lights in polarization direction mix.Different with the present invention, the present invention adopts two mutually perpendicular linearly polarized lights in polarization direction to mix, and optical principle is different.Apparatus of the present invention compact conformation, simple, can be applicable to free space laser communication coherent reception field.
Summary of the invention
The object of the invention is to provide a kind of optical mixer unit, and this device can make that flashlight and local oscillator light are relevant to be mixed, and export four the tunnel have relative phase difference 90 degree coherent light.
Technical scheme of the present invention is: a kind of optical mixer unit, and its special character is: a kind of optical mixer unit, this installs by polaroid (3), polaroid (4); Unpolarized Amici prism (5), λ/2 wave plates (6), unpolarized Amici prism (7); Polaroid (8), λ/4 wave plates (9), polaroid (10); Unpolarized Amici prism (11), polaroid (12), λ/4 wave plates (13) and polaroid (14) are formed.
The light transmission shaft direction of above-mentioned polaroid (3) is parallel to the principal section perpendicular to optical propagation direction.
The light transmission shaft direction of above-mentioned polaroid (4) is perpendicular to the principal section.
The quick shaft direction of above-mentioned λ/2 wave plates (6), λ/4 wave plates (9) and λ/4 wave plates (13) is parallel to the principal section perpendicular to optical propagation direction, and slow-axis direction is perpendicular to the principal section.
The light transmission shaft of above-mentioned polaroid (8), polaroid (10), polaroid (12) and polaroid (14) and principal section normal angle 45 degree.
Flashlight (1) process polaroid (3) and local oscillator light (2) process polaroid (4) are after unpolarized Amici prism (5) is located to converge; After unpolarized Amici prism (5) is with local oscillator light and flashlight mixing, be divided into I, II two-way; The I road is divided into two-way again through unpolarized Amici prism (7); One tunnel process polaroid (8) back phase place is 0, and another road is 90 degree through λ/4 wave plates (9) and polaroid (10) back phase place.The II road is divided into two-way again through behind λ/2 wave plates (6) and the Amici prism (11), the one tunnel through polaroid (12) back for being 180 degree mutually, another road through λ/4 wave plates (13) and polaroid (14) after phase place be 270 to spend.
Technical problem underlying and good effect that the present invention can solve are:
1, can realize the mixing that is concerned with of flashlight and local oscillator light, and export four tunnel phase shifts, 90 degree coherent lights.
2, principle scheme is simple, and compact conformation is beneficial to the volume miniaturization Design.
Description of drawings
Accompanying drawing is a kind of optical mixer unit structural representation;
Drawing reference numeral explanation: 1-flashlight; 2-local oscillator light; The 3-polaroid; The 4-polaroid; The unpolarized Amici prism of 5-; 6-λ/2 wave plates; The unpolarized Amici prism of 7-; The 8-polaroid; 9-λ/4 wave plates; The 10-polaroid; The unpolarized Amici prism of 11-; The 12-polaroid; 13-λ/4 wave plates; The 14-polaroid.
Embodiment
The present invention relates to a kind of optical mixer unit, this installs by polaroid (3), polaroid (4); Unpolarized Amici prism (5), λ/2 wave plates (6), unpolarized Amici prism (7); Polaroid (8), λ/4 wave plates (9), polaroid (10); Unpolarized Amici prism (11), polaroid (12), λ/4 wave plates (13) and polaroid (14) are formed.Flashlight (1) and local oscillator light (2) pass through polaroid (3) respectively and polaroid (4) back is located to converge at unpolarized Amici prism (5); Through being divided into two-way light behind the unpolarized Amici prism (5); After one road light reflected through unpolarized prism (7), behind polaroid (8), obtaining phase place again was 0 degree coherent light.After unpolarized prism (7) transmission, behind polaroid (9) and polaroid (10), obtain the coherent light that relative phase is 90 degree again.Another road light through unpolarized Amici prism (11) transmission, obtains the coherent light that relative phase is 180 degree through polaroid (12) through behind λ/2 wave plates (6) again.After unpolarized Amici prism (11) reflection, behind polaroid (13) and polaroid (14), obtain the coherent light that relative phase is 270 degree again.
Claims (5)
1. optical mixer unit is characterized in that: by polaroid (3), and polaroid (4); Unpolarized Amici prism (5), λ/2 wave plates (6), unpolarized Amici prism (7); Polaroid (8), λ/4 wave plates (9), polaroid (10); Unpolarized Amici prism (11), polaroid (12), λ/4 wave plates (13) and polaroid (14) constitute.
2. a kind of optical mixer unit according to claim 1 is characterized in that: flashlight becomes behind polaroid (3) and is parallel to the principal section and perpendicular to the linearly polarized light of optical propagation direction, and local oscillator light becomes the linearly polarized light perpendicular to the principal section after through polaroid (4).
3. a kind of optical mixer unit according to claim 1 is characterized in that: λ/4 wave plates (9), and the quick shaft direction of λ/4 wave plates (13) and λ/2 wave plates (6) is parallel to the principal section perpendicular to optical propagation direction, and slow-axis direction is perpendicular to the principal section.
4. a kind of optical mixer unit according to claim 1 is characterized in that: the light transmission shaft of polaroid (8), polaroid (10), polaroid (12) and polaroid (14) and the angle of principal section normal 45 degree.
5. according to claim 2, it is characterized in that: the light transmission shaft of polaroid (3) and polaroid (4) can exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104026469A CN102495477A (en) | 2011-12-07 | 2011-12-07 | Optical mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104026469A CN102495477A (en) | 2011-12-07 | 2011-12-07 | Optical mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102495477A true CN102495477A (en) | 2012-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104026469A Pending CN102495477A (en) | 2011-12-07 | 2011-12-07 | Optical mixer |
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| CN (1) | CN102495477A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297937A (en) * | 2014-07-28 | 2015-01-21 | 中国科学院西安光学精密机械研究所 | 90-degree optical mixer based on transverse shearing interferometer |
| CN111025668A (en) * | 2019-12-30 | 2020-04-17 | 珠海光库科技股份有限公司 | Optical device integrating polarization coherent beam splitting |
| CN115113410A (en) * | 2022-06-17 | 2022-09-27 | 中国科学院上海光学精密机械研究所 | Multi-wavelength prism type space optical bridge |
Citations (2)
| 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 |
| CN102253499A (en) * | 2011-06-27 | 2011-11-23 | 长春理工大学 | Double-path 90-degree optical mixer |
-
2011
- 2011-12-07 CN CN2011104026469A patent/CN102495477A/en active Pending
Patent Citations (2)
| 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 |
| CN102253499A (en) * | 2011-06-27 | 2011-11-23 | 长春理工大学 | Double-path 90-degree optical mixer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297937A (en) * | 2014-07-28 | 2015-01-21 | 中国科学院西安光学精密机械研究所 | 90-degree optical mixer based on transverse shearing interferometer |
| CN111025668A (en) * | 2019-12-30 | 2020-04-17 | 珠海光库科技股份有限公司 | Optical device integrating polarization coherent beam splitting |
| CN115113410A (en) * | 2022-06-17 | 2022-09-27 | 中国科学院上海光学精密机械研究所 | Multi-wavelength prism type space optical bridge |
| CN115113410B (en) * | 2022-06-17 | 2023-10-10 | 中国科学院上海光学精密机械研究所 | Multi-wavelength prism type space optical bridge |
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Application publication date: 20120613 |