CN201541265U - Optical mixer - Google Patents
Optical mixer Download PDFInfo
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- CN201541265U CN201541265U CN2009202633484U CN200920263348U CN201541265U CN 201541265 U CN201541265 U CN 201541265U CN 2009202633484 U CN2009202633484 U CN 2009202633484U CN 200920263348 U CN200920263348 U CN 200920263348U CN 201541265 U CN201541265 U CN 201541265U
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Abstract
The utility model relates to the field of optical communication, in particular to an optical mixer. The optical mixer comprises two input polarized light splitters, two half-wave plates, two quarter-wave plates, an un-polarized light splitter and four output polarized beam splitters. Incident signal light is split by the input polarized light splitters to form linear polarized light vertical to the polarization direction, namely signal light S (X) and signal light S (Y) respectively; and incident local oscillator light is split by the polarized light splitters to form linear polarized light vertical to the polarization direction, namely local oscillator light L (X) and local oscillator light L (Y). The incident signal light and the incident local oscillator light pass through the optical mixer and then are output from eight ports, and the signal light S (X) and the local oscillator light L (X) split by the polarized light splitters interfere to output four paths of light. The optical mixer adopts free spatial optical design, and has the advantages of good temperature stability, small volume and low cost.
Description
Technical field
The utility model relates to the optical communication device field, relates in particular to the optical mixer unit of using in the coherent detection receiver (Optical Hybrid).
Background technology
At optical communication field, bigger bandwidth, longer transmission range, higher receiving sensitivity all are pursuing one's goal of scientific research person forever.Although the application of wavelength division multiplexing (WDM) technology and erbium-doped fiber amplifier (EDFA) has improved the bandwidth and the transmission range of optical communication system greatly, the information explosion formula that is accompanied by the universal generation of the application of the communication technology such as video conference and the Internet increases, and the physical layer as the whole communication system basis has been proposed higher transmission performance requirement.Traditional amplitude keying (OOK) modulation system and direct intensity detection reception technique have been difficult to satisfy the requirement of these transmission performances, and transmission range and raising transmission capacity in order to prolong existing cable network efficiently need solve a plurality of technical barriers.These technical barriers comprise: the raising system overcomes the ability of noise, Transmit Degrade, have higher spectrum efficiency.In order to reach this target, need to consider to use new modulation technique, as: differential phase keying (DPSK) (DPSK) modulation technique, also will adopt the electrical equalization technology simultaneously.
In order further to improve transmission capacity and unrepeatered transmission distance, we need break through existing direct-detection receiver reason, adopt the coherent optical detection technology.The coherent optical detection technology, except the amplitude of sensed light signal, phase place and polarization state (polarization state) that can also sensed light signal.After adopting the coherent light technology, in same spectral bandwidth, just can transmit more large-capacity data.In addition, in the coherent light system, the phase information of light signal can be used to compensate efficiently the deterioration of the caused signal of optical transmission in electric territory.
After adopting the coherent light reception technique, the phase place of received signal and polarization can detect more efficiently in electric territory.The distortion that optical transmission causes also can compensate by the electrical equalization device well, and then realizes farther transmission range.Can also save the dispersion compensating fiber and the image intensifer of receiver side like this.
In addition, if ignore the relative intensity noise of local oscillator light source, received signal with the local oscillation signal mixing after, can obtain amplifying, and noise objective can deterioration.With not comparing with the direct detection effect of preposition image intensifer (putting in advance), adopt the sensitivity of coherent reception technology to improve about 20dB, even adopt image intensifer, directly detection mode is also more inferior than coherent reception technology aspect sensitivity.
The coherent light reception technique is combined with advanced modulation system and signal of telecommunication treatment technology, can improve the capacity of existing optical transmission chain and transmission range, raising spectrum efficiency greatly, reducing the construction costs and O﹠M cost; Simultaneously, the coherent reception technology can use the electrical equalization technology accurately to compensate the deterioration that optical transmission causes, and therefore network design also can become more flexible.
The basic structure of coherent optical communication system is at transmitting terminal, adopts the external modulation mode to modulate the signal on the light carrier and transmits.When flashlight transmission arrives receiving terminal, at first with a local oscillator light signal by the optical mixer unit coupling that is concerned with, survey by balanced reciver then.Coherent optical communication does not wait with the flashlight frequency according to the local oscillator light frequency or equates, can be divided into heterodyne and detect and homodyne detection.What the former light signal obtained after opto-electronic conversion is intermediate-freuqncy signal, also needs secondary demodulation just can be converted into baseband signal.Latter's light signal is directly changed into baseband signal after opto-electronic conversion, without secondary demodulation, but it requires local oscillator light frequency and the strict coupling of flashlight frequency, and requires the phase locking of local oscillator light and flashlight.
In coherent optical communication, coherent detection requires signal beams with local beam identical polarization direction must be arranged, and that is to say, both electric vector directions must be identical, could obtain the high sensitivity that coherent reception can provide.Otherwise, coherent detection sensitivity is descended.Because in this case, have only the projection of signal light-wave electric vector on local oscillator light wave electric vector direction, just the intermediate-freuqncy signal electric current that really mixing is produced has contribution.If the mismatch angle surpasses 60 °, then the sensitivity of receiver almost can not get any improvement, thereby loses the superiority of coherent reception.Therefore, in order to give full play to the superiority of coherent reception, in coherent optical communication, should take light wave polarization stabilizing measures.Mainly contain two kinds of methods: the one, adopt " polarization maintaining optical fibre " to make light wave in transmission course, keep the polarization state of light wave constant.And common single mode optical fibres can be because factors such as the mechanical oscillation of optical fiber or variations in temperature change the polarization state of light wave." polarization maintaining optical fibre " compared with monomode fiber, and its loss ratio is bigger, the price comparison costliness.Two are to use common single mode optical fibres, adopt the polarization diversity technology at receiving terminal, received signal light resolves into the signal of two quadratures earlier by a polarization beam apparatus, each orthogonal signalling light all with the local oscillator photomixing, after converting the light signal of exporting after the mixing to the signal of telecommunication, just can carry out polarization demultiplexing in electron region.
The utility model content
Therefore, the purpose of this utility model has been to provide a kind of and has been applicable to that the optical mixer unit in the application of coherent detection receiver is to satisfy above-mentioned requirements in the optical communication system.
The technical solution of the utility model is:
Optical mixer unit of the present utility model, flashlight of incident (301) and local oscillator light (302) enter optical mixer unit by first collimater (101) and second collimater (116) respectively.Optical mixer unit comprises polarization spectro element (102,115,105,107,110,117), half-wave plate (103,104), quarter-wave plate (112,113) and the unpolarized spectroscope (109) that is arranged on the light path, wherein, one polarization spectro element (102) is set after first collimater (101) outgoing place, the flashlight (301) of incident is divided into intensity equates, the orthogonal linearly polarized light in polarization direction, promptly is divided into flashlight S
X(201) and flashlight S
Y(202);
Flashlight S
X(201) be provided with half of wave plate (103) after, change flashlight S
X(201) polarization direction makes flashlight S
X(201) polarization direction is at the flashlight S perpendicular to incident
X(201) rotation is 45 ° in the plane;
Flashlight S
Y(202) be provided with half of wave plate (104) after, change flashlight S
Y(202) polarization direction makes flashlight S
Y(202) polarization direction is at the flashlight S perpendicular to incident
Y(202) rotation is 45 ° in the plane;
One polarization spectro element (115) is set after second collimater (116) outgoing place, the local oscillator light (302) of incident is divided into intensity equates, the orthogonal linearly polarized light in polarization direction, promptly be divided into local oscillator light L
X(203) and local oscillator light L
Y(204);
Local oscillator light L
X(203) be provided with a quarter-wave plate (112) after, make local oscillator light L
X(203) by becoming circularly polarized light behind this quarter-wave plate (112), the light component intensity of this circularly polarized light on directions X and Y direction equates and has the phase difference of pi/2;
Local oscillator light L
Y(204) be provided with a quarter-wave plate (113) after, make local oscillator light L
Y(204) by becoming circularly polarized light behind this quarter-wave plate (113), the light component intensity of this circularly polarized light on directions X and Y direction equates and has the phase difference of pi/2;
Flashlight S
X(201) with local oscillator light L
X(203) and flashlight S
Y(202) with local oscillator light L
YOne unpolarized spectroscope (109) is set on the axis of intersection point (204);
Flashlight S
X(201) be divided into the flashlight S of reflection by unpolarized spectroscope (109)
X(2011) and the flashlight S of transmission
X(2012), flashlight S
Y(202) be divided into the flashlight S of reflection by unpolarized spectroscope (109)
Y(2021) and the flashlight S of transmission
Y(2022), local oscillator light L
X(203) be divided into the local oscillator light L of reflection by unpolarized spectroscope (109)
X(2031) and the local oscillator light L of transmission
X(2032), local oscillator light L
Y(204) be divided into the local oscillator light L of reflection by unpolarized spectroscope (109)
Y(2041) and the local oscillator light L of transmission
Y(2042); The flashlight S of reflection
X(2011) and the local oscillator light L of transmission
X(2032) altogether light path axis and producing is interfered, and by the polarization spectro element (105) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
The flashlight S of reflection
Y(2021) and the local oscillator light L of transmission
Y(2042) altogether light path axis and producing is interfered, and by the polarization spectro element (107) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
The flashlight S of transmission
X(2012) and the reflection local oscillator light L
X(2031) altogether light path axis and producing is interfered, and by the polarization spectro element (110) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
The flashlight S of transmission
Y(2022) and the reflection local oscillator light L
Y(2041) altogether light path axis and producing is interfered, and by the polarization spectro element (117) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
Wherein, above-mentioned directions X is perpendicular to the light path direction of propagation and is parallel to the direction of paper, and the Y direction is perpendicular to the light path direction of propagation and perpendicular to the direction of paper.
Further, described half-wave plate (103,104) optical axis direction becomes 22.5 ° or 67.5 ° with directions X or Y direction.The optical axis direction of described quarter-wave plate (112,113) and directions X or Y direction are at 45.
Further, the crooked light path of a plurality of refracting prisms (121,122,123,124,125) is set on described light path, forms compact structure, the compressing member volume that takes up room.
Further, described two polarization spectro elements (102,115) are wollaston prism (WollastonPrism).
Perhaps, the wollaston prism of above-mentioned two polarization spectro elements (102,115) can be substituted by polarization splitting prism (PBS) (119,120).
Further, the polarization spectro element of described four outputs (105,107,110,117) is wollaston prism (Wollaston Prism).
Further, be respectively equipped with four double-fiber collimators (106,108,111,118) coupling output behind the polarization spectro element of described four outputs (105,107,110,117).
Further, the Insertion Loss that a plurality of attenuators come each road output light of balance is set on described light path.
The utility model proposes a kind of method that two-way is interfered the output optical path difference of controlling, the light path light path is compensated, can interfere output light path delay inequality to control to 1ps eight the tunnel with interior optical mixer unit with compensating plate.
The utility model adopts as above technical scheme, and it is simple relatively to have proposed a kind of structure, and what be easy to realize is applicable to the optical mixer unit in using of coherent detection receiver in the optical communication system.It has the Free Space Optics design, and temperature stability is good, and volume is little, the advantage that cost is low.
Description of drawings
Fig. 1 is a general illustration of the present utility model;
Fig. 2 is the structural representation of embodiment 1 of the present utility model;
Fig. 3 is the structural representation of embodiment 2 of the present utility model.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
Consult Fig. 1 and Fig. 2, shown in Figure 3, optical mixer unit of the present utility model, incoming signal light and local oscillator light enter this optical mixer unit device by the collimater 101 of flashlight and the collimater 116 of local oscillator light respectively, this device comprises and is set in turn in light path: two input polarization beam splitters 102,115 or 119,120, be used for incoming signal light and local oscillator light is divided into that intensity equates, the orthogonal linearly polarized light in polarization direction, be divided into flashlight S (X) and flashlight S (Y), local oscillator light L (X) and local oscillator light L (Y); Two half-wave plates 103,104 are used for changing respectively the polarization direction of flashlight S (X) and flashlight S (Y), make the polarization direction of flashlight rotate 45 ° in perpendicular to the plane of incident light; Two quarter-wave plates 112,113, be used for making respectively local oscillator light L (X) and local oscillator light L (Y) all the light component intensity on X and Y direction equate and have the phase difference of pi/2; One unpolarized beam splitter 109 is used for flashlight and local oscillator light are divided into transmitted light and reverberation and produce interference, obtains four road light; Four output polarization beam splitters 105,107,110,117, the light signal after being used for interfering four tunnel respectively is along X and Y direction polarization spectro and export eight road light signals; Eight road light signals are respectively with 106,108,111, the 118 coupling outputs of four double-fiber collimators.
Embodiment 1:
Consult shown in Figure 2, flashlight is entered by collimater 101, after wollaston prism (WollastonPrism) 102 beam split, be divided into the vertical light signal in two bundle polarization directions, wherein this two-beam signal becomes behind 22.5 ° the half-wave plate polarization direction and the former direction of flashlight at 45 through optical axis direction respectively with directions X or Y direction, this two-beam all equates in the component intensity of X and Y direction and phase place, and two-beam arrives the two-beam that is divided into transmission and reflection behind the unpolarized light splitting piece 109; Simultaneously, enter by collimater 116 at a branch of local oscillator light of symmetry direction, after wollaston prism (Wollaston Prism) 115 beam split, be divided into the vertical light signal in two bundle polarization directions, flashlight became circularly polarized light after wherein this two-beam signal passed through optical axis direction and X or Y direction quarter-wave plate at 45 respectively, this two-beam equates that in X and Y durection component intensity phase place differs pi/2, and two-beam arrives the two-beam that is divided into transmission and reflection behind the unpolarized light splitting piece 109; Produce interference by the flashlight of unpolarized light splitting piece back reflection and the local oscillator light of transmission, the local oscillator light of the flashlight of transmission and reflection produces interferes, obtain four tunnel flashlights of interfering, again through realizing the output of eight road light after the beam split of outgoing wollaston prism, this eight road light is respectively the S+L (X) that exports after S (X) and L (X) mixing, S+jL (X), S-L (X), S-jL (X), and the S+L (Y) that exports after S (Y) and L (Y) mixing, S+jL (Y), S-L (Y), S-jL (Y), if flashlight S and local oscillator light L are Φ x at the phase difference of S+L (X) end, then flashlight S and local oscillator light L be at S+jL (X), S-L (X), and the phase difference of S-jL (X) end is respectively Φ x+90 °, Φ x+180 °, Φ x+270 °, establishing flashlight S and local oscillator light L equally is Φ y at the phase difference of S+L (Y) end, and then flashlight S and local oscillator light L are at S+jL (Y), S-L (Y), the phase difference of S-jL (Y) end is respectively Φ y+90 °, Φ y+180 °, and Φ y+270 °; Signal output back S+L and S-L, S+jL and S-jL adopt balance to receive, and demodulate signal after handling by electron region.
Embodiment 2:
The device of Fig. 3 is the differentiation structure of Fig. 2, its principle and Fig. 2 are basic identical, its difference is that the polarization spectro element has changed polarization splitting prism (PBS) into by the wollaston prism among Fig. 2 (Wollaston Prism) among Fig. 3, add some speculums in the light path and change eight road light that light paths can realize the two-way light imported and output with on one side, volume is littler.
Consult shown in Figure 3, flashlight is entered by collimater 101, after polarization spectroscope (PBS) 119 beam split, be divided into the vertical light signal in two bundle polarization directions, wherein this two-beam signal becomes behind 22.5 ° the half-wave plate polarization direction and the former direction of flashlight at 45 through optical axis direction respectively with directions X or Y direction, this two-beam all equates in the component intensity of X and Y direction and phase place, and two-beam arrives the two-beam that is divided into transmission and reflection behind the unpolarized light splitting piece 109; Simultaneously, enter by collimater 116 at a branch of local oscillator light of symmetry direction, after polarization spectroscope (PBS) 120 beam split, be divided into the vertical light signal in two bundle polarization directions, flashlight became circularly polarized light after wherein this two-beam signal passed through optical axis direction and X or Y direction quarter-wave plate at 45 respectively, this two-beam equates that in X and Y durection component intensity phase place differs pi/2, and two-beam arrives the two-beam that is divided into transmission and reflection behind the unpolarized light splitting piece 109; Produce interference by the flashlight of unpolarized light splitting piece back reflection and the local oscillator light of transmission, the local oscillator light of the flashlight of transmission and reflection produces interferes, obtain four tunnel flashlights of interfering, again through realizing the output of eight road light after the beam split of outgoing wollaston prism, this eight road light is respectively the S+L (X) that exports after S (X) and L (X) mixing, S+jL (X), S-L (X), S-jL (X), and the S+L (Y) that exports after S (Y) and L (Y) mixing, S+jL (Y), S-L (Y), S-jL (Y), if flashlight S and local oscillator light L are Φ x at the phase difference of S+L (X) end, then flashlight S and local oscillator light L be at S+jL (X), S-L (X), and the phase difference of S-jL (X) end is respectively Φ x+90 °, Φ x+180 °, Φ x+270 °, establishing flashlight S and local oscillator light L equally is Φ y at the phase difference of S+L (Y) end, and then flashlight S and local oscillator light L are at S+jL (Y), S-L (Y), the phase difference of S-jL (Y) end is respectively Φ y+90 °, Φ y+180 °, and Φ y+270 °; Signal output back S+L and S-L, S+jL and S-jL adopt balance to receive, and demodulate signal after handling by electron region.
Further, be accurate pi/2 in order to make local oscillator light through the phase difference of directions X component behind the quarter-wave plate and Y durection component, can finely tune by the vertical optical path rotating wave plate.
Further, relatively good for the Insertion Loss consistency of eight road light that make output, the attenuator that can add some, certain reflectivity in light path comes each road Insertion Loss of balance.
The above embodiments have adopted the Free Space Optics design, have excellent temperature stability, less size and lower cost.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.
Claims (9)
1. optical mixer unit, flashlight of incident (301) and local oscillator light (302) enter optical mixer unit by first collimater (101) and second collimater (116) respectively, it is characterized in that: comprise the polarization spectro element (102,115,105,107,110,117), half-wave plate (103,104), quarter-wave plate (112,113) and the unpolarized spectroscope (109) that are arranged on the light path, wherein
One polarization spectro element (102) is set after first collimater (101) outgoing place, the flashlight (301) of incident is divided into intensity equates, the orthogonal linearly polarized light in polarization direction, promptly be divided into flashlight S
X(201) and flashlight S
Y(202);
Be provided with half of wave plate (103) behind the flashlight SX (201), change the polarization direction of flashlight SX (201), the polarization direction that makes flashlight SX (201) rotates 45 ° in the plane perpendicular to the flashlight SX (201) of incident;
Be provided with half of wave plate (104) behind the flashlight SY (202), change the polarization direction of flashlight SY (202), the polarization direction that makes flashlight SY (202) rotates 45 ° in the plane perpendicular to the flashlight SY (202) of incident;
One polarization spectro element (115) is set after second collimater (116) outgoing place, the local oscillator light (302) of incident is divided into intensity equates, the orthogonal linearly polarized light in polarization direction, promptly be divided into local oscillator light LX (203) and local oscillator light LY (204);
Be provided with a quarter-wave plate (112) behind the local oscillator light LX (203), become circularly polarized light after making local oscillator light LX (203) by this quarter-wave plate (112), the light component intensity of this circularly polarized light on directions X and Y direction equates and has the phase difference of pi/2;
Be provided with a quarter-wave plate (113) behind the local oscillator light LY (204), become circularly polarized light after making local oscillator light LY (204) by this quarter-wave plate (113), the light component intensity of this circularly polarized light on directions X and Y direction equates and has the phase difference of pi/2;
On the axis of the intersection point of flashlight SX (201) and local oscillator light LX (203) and flashlight SY (202) and local oscillator light LY (204) a unpolarized spectroscope (109) is set;
Flashlight SX (201) is divided into the flashlight SX (2011) of reflection and the flashlight SX (2012) of transmission by unpolarized spectroscope (109), flashlight SY (202) is divided into the flashlight SY (2021) of reflection and the flashlight SY (2022) of transmission by unpolarized spectroscope (109), local oscillator light LX (203) is divided into the local oscillator light LX (2031) of reflection and the local oscillator light LX (2032) of transmission by unpolarized spectroscope (109), and local oscillator light LY (204) is divided into the local oscillator light LY (2041) of reflection and the local oscillator light LY (2042) of transmission by unpolarized spectroscope (109);
The flashlight SX (2011) of reflection and the local oscillator light LX (2032) of transmission light path axis and producing altogether interfere, and by the polarization spectro element (105) of output, this road interference light along directions X and Y direction polarization spectro, and are exported two the tunnel and are exported light;
The flashlight SY (2021) of reflection and the local oscillator light LY (2042) of transmission light path axis and producing altogether interfere, and by the polarization spectro element (107) of output, this road interference light along directions X and Y direction polarization spectro, and are exported two the tunnel and are exported light;
The local oscillator light LX (2031) of the flashlight SX (2012) of transmission and reflection altogether light path axis and producing interferes, and by the polarization spectro element (110) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
The local oscillator light LY (2041) of the flashlight SY (2022) of transmission and reflection altogether light path axis and producing interferes, and by the polarization spectro element (117) of output, this road interference light along directions X and Y direction polarization spectro, and is exported two tunnel output light;
Wherein, above-mentioned directions X is perpendicular to the light path direction of propagation and is parallel to the direction of paper, and the Y direction is perpendicular to the light path direction of propagation and perpendicular to the direction of paper.
2. optical mixer unit according to claim 1 is characterized in that: described half-wave plate (103,104) optical axis direction becomes 22.5 ° or 67.5 ° with directions X or Y direction.
3. optical mixer unit according to claim 1 is characterized in that: the optical axis direction of described quarter-wave plate (112,113) and directions X or Y direction are at 45.
4. optical mixer unit according to claim 1 is characterized in that: the crooked light path of a plurality of refracting prisms (121,122,123,124,125) is set on described light path.
5. optical mixer unit according to claim 1 is characterized in that: described two polarization spectro elements (102,115) are wollaston prisms.
6. optical mixer unit according to claim 5 is characterized in that: the wollaston prism of described two polarization spectro elements (102,115) can be substituted by polarization splitting prism (119,120).
7. optical mixer unit according to claim 1 is characterized in that: the polarization spectro element of described four outputs (105,107,110,117) is a wollaston prism.
8. according to claim 1 or 7 described optical mixer units, it is characterized in that: be respectively equipped with four double-fiber collimators (106,108,111,118) coupling output behind the polarization spectro element of described four outputs (105,107,110,117).
9. optical mixer unit according to claim 1 is characterized in that: a plurality of attenuators are set on described light path.
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| CN2009202633484U CN201541265U (en) | 2009-11-18 | 2009-11-18 | Optical mixer |
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| CN2009202633484U CN201541265U (en) | 2009-11-18 | 2009-11-18 | Optical mixer |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087421A (en) * | 2010-12-03 | 2011-06-08 | 武汉光迅科技股份有限公司 | Crystal-type optical mixer for coherent optical communication |
| CN102142901A (en) * | 2011-01-21 | 2011-08-03 | 武汉邮电科学研究院 | Coherent demodulation method with no need of control on polarization state of local oscillation light |
| CN103163514A (en) * | 2013-03-06 | 2013-06-19 | 北京航空航天大学 | Device for eliminating laser radar speed measuring zero point |
| CN107132663A (en) * | 2017-06-14 | 2017-09-05 | 长春理工大学 | 90 ° of frequency mixers of spatial light that splitting ratio adaptively regulates and controls |
| CN107861257A (en) * | 2017-12-08 | 2018-03-30 | 武汉邮电科学研究院 | Optical mixer unit based on super surfacing and preparation method thereof |
| CN113949461A (en) * | 2021-09-07 | 2022-01-18 | 中航海信光电技术有限公司 | Free space coherent receiver |
| CN114244438A (en) * | 2021-12-16 | 2022-03-25 | 苏州易锐光电科技有限公司 | Optical processing device, optical amplifier, and optical modulator |
| CN115102627A (en) * | 2022-06-20 | 2022-09-23 | 苏州大学 | Optical fiber transmission receiving end and optical fiber communication system based on differential modulation |
| 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 |
| CN115437160A (en) * | 2022-11-03 | 2022-12-06 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
| CN115542565A (en) * | 2022-11-03 | 2022-12-30 | 北京中科国光量子科技有限公司 | 90-degree space optical mixer insensitive to polarization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102087421A (en) * | 2010-12-03 | 2011-06-08 | 武汉光迅科技股份有限公司 | Crystal-type optical mixer for coherent optical communication |
| CN102087421B (en) * | 2010-12-03 | 2012-05-30 | 武汉光迅科技股份有限公司 | Crystal-type optical mixer for coherent optical communication |
| CN102142901A (en) * | 2011-01-21 | 2011-08-03 | 武汉邮电科学研究院 | Coherent demodulation method with no need of control on polarization state of local oscillation light |
| CN102142901B (en) * | 2011-01-21 | 2013-07-31 | 武汉邮电科学研究院 | Coherent demodulation method with no need of control on polarization state of local oscillation light |
| CN103163514A (en) * | 2013-03-06 | 2013-06-19 | 北京航空航天大学 | Device for eliminating laser radar speed measuring zero point |
| CN103163514B (en) * | 2013-03-06 | 2014-12-03 | 北京航空航天大学 | Device for eliminating laser radar speed measuring zero point |
| CN107132663B (en) * | 2017-06-14 | 2019-05-07 | 长春理工大学 | 90 ° of frequency mixers of spatial light that splitting ratio adaptively regulates and controls |
| CN107132663A (en) * | 2017-06-14 | 2017-09-05 | 长春理工大学 | 90 ° of frequency mixers of spatial light that splitting ratio adaptively regulates and controls |
| CN107861257A (en) * | 2017-12-08 | 2018-03-30 | 武汉邮电科学研究院 | Optical mixer unit based on super surfacing and preparation method thereof |
| CN107861257B (en) * | 2017-12-08 | 2019-09-27 | 武汉邮电科学研究院 | Optical mixer unit and preparation method thereof based on super surfacing |
| CN113949461A (en) * | 2021-09-07 | 2022-01-18 | 中航海信光电技术有限公司 | Free space coherent receiver |
| CN114244438A (en) * | 2021-12-16 | 2022-03-25 | 苏州易锐光电科技有限公司 | Optical processing device, optical amplifier, and optical modulator |
| 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 |
| CN115102627A (en) * | 2022-06-20 | 2022-09-23 | 苏州大学 | Optical fiber transmission receiving end and optical fiber communication system based on differential modulation |
| CN115102627B (en) * | 2022-06-20 | 2023-09-22 | 苏州大学 | Optical fiber transmission receiving end and optical fiber communication system based on differential modulation |
| CN115437160A (en) * | 2022-11-03 | 2022-12-06 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
| CN115542565A (en) * | 2022-11-03 | 2022-12-30 | 北京中科国光量子科技有限公司 | 90-degree space optical mixer insensitive to polarization |
| CN115437160B (en) * | 2022-11-03 | 2023-01-03 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
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