CN202818311U - Coherent optical receiver - Google Patents
Coherent optical receiver Download PDFInfo
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- CN202818311U CN202818311U CN 201120509558 CN201120509558U CN202818311U CN 202818311 U CN202818311 U CN 202818311U CN 201120509558 CN201120509558 CN 201120509558 CN 201120509558 U CN201120509558 U CN 201120509558U CN 202818311 U CN202818311 U CN 202818311U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 230000001427 coherent effect Effects 0.000 title abstract description 5
- 230000010287 polarization Effects 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 230000008033 biological extinction Effects 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036039 immunity Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
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Abstract
The utility model provides a coherent optical receiver, comprising an input light, a local reference light, an optical splitter, a polarization optical splitter, a 1/2 wave-plate and an M-Z interferometer chip, wherein small part of light beams of the input light is separated by means of the optical splitter and is received and detected by a photodiode, and large part of light beams are separated to the polarization optical splitter; polarized lights p and s with mutually perpendicular polarization states are generated by means of the polarization optical splitter and are converted into p polarized lights or s polarized lights through the 1/2 wave-plate; the characteristics are that a polarizing film is also included; mutually parallel p or s polarized lights and the local reference light are converted into a same polarization state beam via the polarizing film and are inputted into an M-Z interferometer waveguide chip to receive and generate interference lights. According to the utility model, beams interfered by the M-Z interferometer chip through light beams with a same polarization state possess a good extinction ratio.
Description
Technical field
The utility model relates to the optical receiver that uses in the optical transmission system, particularly a kind of optical receiver of relevant optical receiver type.
Background technology
In order to realize 40GB Gigabits per second (Gbit/s) or above Superhigh Speed Optical Transmission system, developed the transceiver of RZ-DQPSK (return-to zero system four phase difference phase-shift keyings) modulation format.From now on, still wish further to improve the optical noise immunity of RZ-DQPSK transceiver, and for example wish by processing with the forceful electric power signal to replace large-scale light Variable Dispersion Compensator so that the realization miniaturization.
As the device that this is realized, for example wish to adopt the coherent reception method such as homodyne type, interpolation type or heterodyne type, and this is studied, by adopting the receiver of phase dry type, the optical noise immunity has improved about 3dB, and compare with postponing direct-detection, can see, owing to the Electric signal processing after the opto-electronic conversion significantly improves the compensation ability to the wavelength dispersion distortion.
The local reference beam that the prior art coherent receiver usually receives signal beams and produces with local light source (LD), interfere the output interfering beam by the free space interferometer, wherein, the relevant circuit of described light is light path free space transmission process, yet impel the introducing of guide technology along with the trend toward miniaturization development, existing relevant circuit can replace by MZ-interferometer PLC mixed light chip the MZ-interferometer of free space, yet, because in above-mentioned coherent reception system, the intrinsic problem that exists is, if the polarization state of the machine reference light of the output of the machine reference light source from be included in optical receiver and the signal polarized state of light of reception are inconsistent, then because the polarization correlation ratio of MZ-interferometer PLC chip is relatively poor, and meeting is so that the flashlight of input the machine reference light and reception in the extinction ratio reduction of MZ-interferometer PLC chip, and can not reach required communication need.
The utility model content
Given this, the purpose of this utility model provides same polarization state and enters MZ-interferometer PLC chip, thereby realizes the High Extinction Ratio performance.
A kind of relevant optical receiver of the utility model comprises an input light, one local reference light, one optical splitter, one polarizing beam splitter, 1/2 wave plate and M-Z interferometer chip, wherein, input light separates the small part light beam by described optical splitter and receives detection by photodiode, isolate most of light beam to a polarizing beam splitter, separate the generation orthogonal polarised light s of polarization state and p by described polarizing beam splitter, described polarised light changes into consistent polarised light S or the polarised light P of two bundle polarization states via one 1/2 wave plates, it is characterized in that: also comprise a polarizer, described two bundle polarization states consistent polarised light S or polarised light P, and local reference light changes into same polarizing beam via described polarizer and inputs to M-Z interferometer waveguide chip and receive the generation interference light.
Wherein, preferred version is: described optical splitter comprises a spectro-film, and described spectro-film reflection small part light beam receives in photodiode and detects, and the most of light beam of transmission is received by polarizing beam splitter.
Wherein, preferred version is: described polarizing beam splitter comprises a polarization beam splitter, and described most of light beam is separated into mutual vertical polarization attitude light beam s and p according to the polarization spectro membrane property.
Wherein, preferred version is: described polarizing beam splitter comprises a reflectance coating, and the light beam s of described separation is reflected into the light beam parallel with polarizing beam p.
Wherein, preferred version is: comprise that also a phase regulator places the light path of the described two-way polarised light of compensation between polarizing beam splitter and the polarizer.
Because the utility model adopts polarizer, with described two bundle polarised light S or polarised light P, and local reference light changes into same polarizing beam and inputs to M-Z interferometer waveguide chip and receive the generation interference light, and the light beam that the light beam of same polarization state is interfered via M-Z interferometer waveguide chip has good extinction ratio.
Description of drawings
The below engages accompanying drawing embodiment of the present utility model is further specified:
Fig. 1 is the index path of the embodiment of a kind of relevant optical receiver of the utility model.
Embodiment
Below in conjunction with accompanying drawing light channel structure of the present utility model is described further.
As shown in Figure 1, a kind of relevant optical receiver 10 is inputted light, local laser 12 generations one local reference light by a collimater 11.
One optical splitter (BS) 13 reflexes to photodiode (PD) 14 with 5% of the input light of collimater 11 input, and the light beam that receives by photodiode (PD) 14 detects the luminous power of input light; Simultaneously, described optical splitter (BS) 13 will be inputted light beam to a polarizing beam splitter (PBS) 15 of light transmission 95%.
Described polarizing beam splitter (PBS) 15 becomes to connect mutually orthogonal polarized component light beam s and a p with 95% beam separation of optical splitter (BS) 13 transmissions, described polarizing beam splitter (PBS) 15 comprises that a polarization beam splitter 151 is with described 95% beam reflection light beam s transmission-polarizing light beam p, described polarizing beam splitter (PBS) 15 also comprises a reflectance coating 152 on the top, the polarised light s that described polarization beam splitter 151 is reflected is reflected into and the equidirectional light beam of light beam p (light beam namely is parallel to each other).
One 1/2 wave plates 16 receive described polarised light s, and described s polarizing beam is rotated into the p polarizing beam; In like manner, 1/2 wave plate 16 also can receive described polarised light p, and described p polarizing beam is rotated into the s light beam.
Present embodiment further is provided with a phase regulator 161 at the light path of polarised light P, makes the two-way light beam have same optical by light path or the polarised light s that regulates polarised light p.
Described local reference light R carries out optical coupling by polarization-maintaining fiber 17, thereby keeps the polarized state of light of propagation.
Also comprise a polarizer 18 in the present embodiment, before placing the light inputting end 191 of M-Z interferometer waveguide chip 19, described two bundle the polarised light S or the P that are parallel to each other, and local reference light changes into same polarizing beam via described polarizer 18 and inputs to M-Z interferometer waveguide chip 19 and receive the generation interference light.
Wherein, the polarization of the two polarised light S that are parallel to each other of bundle or P and local reference light is basically identical.
Described M-Z interferometer waveguide chip 19 is the optics hybrid circuits with three input ports and eight output ports, converge first and second port that is input to the input port from parallel light beam S or P via lens 191,192, and the machine reference light R that produces from local oscillator is transfused to the 3rd port.3*8M-Z interferometer waveguide chip 19 is interfered input beam S, light beam P and the machine reference light R with combination mutually.
Because the utility model adopts polarizer 18, with described polarised light S or the P that is parallel to each other, and local reference light changes into same polarizing beam and inputs to M-Z interferometer waveguide chip and receive the generation interference light, and the light beam that the light beam of same polarization state is interfered via M-Z interferometer waveguide chip has good extinction ratio.
Although specifically introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.
Claims (5)
1. relevant optical receiver, comprise an input light, one local reference light, one optical splitter, one polarizing beam splitter, 1/2 wave plate and M-Z interferometer chip, wherein, input light separates the small part light beam by described optical splitter and receives detection by photodiode, isolate most of light beam to a polarizing beam splitter, separate the generation orthogonal polarised light s of polarization state and p by described polarizing beam splitter, described polarised light changes into consistent polarised light S or the polarised light P of two bundle polarization states via one 1/2 wave plates, it is characterized in that: also comprise a polarizer, described two bundle polarization states consistent polarised light S or polarised light P, and local reference light changes into same polarizing beam via described polarizer and inputs to M-Z interferometer waveguide chip and receive the generation interference light.
2. the optical receiver that is concerned with as claimed in claim 1, it is characterized in that: described optical splitter comprises a spectro-film, and described spectro-film reflection small part light beam receives in photodiode and detects, and the most of light beam of transmission is received by polarizing beam splitter.
3. the optical receiver that is concerned with as claimed in claim 1, it is characterized in that: described polarizing beam splitter comprises a polarization beam splitter, described most of light beam is separated into mutual vertical polarization attitude light beam s and p according to the polarization spectro membrane property.
4. relevant optical receiver as claimed in claim 1, it is characterized in that: described polarizing beam splitter comprises a reflectance coating, and the light beam s of described separation is reflected into the light beam parallel with polarizing beam p.
5. the optical receiver that is concerned with as claimed in claim 1 is characterized in that: comprise that also a phase regulator places the light path of the described two-way polarised light of compensation between polarizing beam splitter and the polarizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120509558 CN202818311U (en) | 2011-12-08 | 2011-12-08 | Coherent optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120509558 CN202818311U (en) | 2011-12-08 | 2011-12-08 | Coherent optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818311U true CN202818311U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120509558 Expired - Lifetime CN202818311U (en) | 2011-12-08 | 2011-12-08 | Coherent optical receiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038291A (en) * | 2014-06-26 | 2014-09-10 | 吴学斌 | Integrated demodulation receiver |
| GB2522082A (en) * | 2014-03-14 | 2015-07-15 | Oclaro Technology Ltd | Optical component |
| CN105162522A (en) * | 2015-07-09 | 2015-12-16 | 中国科学院上海光学精密机械研究所 | Local phase-locked orthogonal polarization free space coherent optical communication device |
| CN108155950A (en) * | 2017-12-27 | 2018-06-12 | 福州大学 | A kind of high-speed type homodyne detection system of gain-adaptive |
-
2011
- 2011-12-08 CN CN 201120509558 patent/CN202818311U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2522082A (en) * | 2014-03-14 | 2015-07-15 | Oclaro Technology Ltd | Optical component |
| GB2522082B (en) * | 2014-03-14 | 2016-02-24 | Oclaro Technology Ltd | Optical component |
| US9787402B2 (en) | 2014-03-14 | 2017-10-10 | Oclaro Technology Limited | Optical component |
| CN104038291A (en) * | 2014-06-26 | 2014-09-10 | 吴学斌 | Integrated demodulation receiver |
| CN104038291B (en) * | 2014-06-26 | 2016-08-24 | 吴学斌 | A kind of integrated demodulation receiver |
| CN105162522A (en) * | 2015-07-09 | 2015-12-16 | 中国科学院上海光学精密机械研究所 | Local phase-locked orthogonal polarization free space coherent optical communication device |
| CN105162522B (en) * | 2015-07-09 | 2017-10-20 | 中国科学院上海光学精密机械研究所 | Phase-locked local cross-polarization free space coherent light communication device |
| CN108155950A (en) * | 2017-12-27 | 2018-06-12 | 福州大学 | A kind of high-speed type homodyne detection system of gain-adaptive |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Wu Junying Document name: Notice of expiration and termination of patent right |