CN201491031U - Light difference phase shift keying demodulator - Google Patents
Light difference phase shift keying demodulator Download PDFInfo
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- CN201491031U CN201491031U CN2009201949348U CN200920194934U CN201491031U CN 201491031 U CN201491031 U CN 201491031U CN 2009201949348 U CN2009201949348 U CN 2009201949348U CN 200920194934 U CN200920194934 U CN 200920194934U CN 201491031 U CN201491031 U CN 201491031U
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Abstract
The utility model relates to the optical communication field, in particular to an optical DPSK demodulator. The light difference phase shift keying demodulator is characterized in that based on a polarized light interference principle, incident light is firstly divided into two paths of polarized lights by a polarized light splitting component, and the two paths of polarized lights have the same polarization directions after passing through a wave plate; then the two paths of polarized lights are respectively and uniformly divided into polarized lights with vertically mutual polarization directions by a light path delay component, after the polarized lights pass through the light path delay component, the light paths have time delay differences matched with the speed of a to-be-demodulated signal, and interference is generated in the position of a next polarized light splitting component to convert a phase signal into an intensity signal; and finally, the to-be-demodulated signal is output after the light composition is carried out by the polarized light composition component. The input polarized light splitting component, the light path delay component, the polarized light splitting component, the polarized light composition component and the like are arranged along the input light path in sequence. The light difference phase shift keying demodulator is optically designed by adopting a free space and has the advantages of good temperature stability, small volume and easy modular realization.
Description
Technical field
The utility model relates to the optical communication field, relates in particular to optical differential phase shift keying (DPSK, Differential Phase-Shift Keying) signal demodulation device.
Background technology
Optical differential phase shift keying (DPSK) is one of optical transport technology research focus in recent years, this modulation technique carries out precoding processing and carries out the difference balance at receiving terminal receiving by the baseband modulation signal to transmitting terminal, can improve the optical receiver sensitivity and the Optical Signal To Noise Ratio tolerance limit of transmission system, have stronger anti-non-linear ability, thereby become at present big capacity, the light modulation techniques mainly selected of optical transmission system at a distance.
Compare with traditional OOK modulation system, the most significant advantage of DPSK is when reaching the identical error rate (BER), and Optical Signal To Noise Ratio required 3dB low.Because the DPSK receiver uses balance detection, the DPSK modulation system power fluctuation to received signal that makes has higher tolerance limit.In the wdm system of 40Gb/s, use DPSK to make signal be subjected to the influence of nonlinear effect littler.Simultaneously, the device of DPSK receiving terminal and optical fiber link and traditional OOK system are quite similar, so commercial process also can be avoided a large amount of changes and reconstruction to existing system.
In light DPSK transmission, data message is to be carried by the light phase between the adjacent bit.During for the detection the light dpsk signal carried out by the intensity detection meter, the signal that the signal of phase code need be changed into intensity coding carries out demodulation, like this demodulator delayed interference meter normally.Interferometric free spectral range (FSR) is the inverse that postpones delay inequality, and in the 1bit interferometer, FSR equals to want the speed of the dpsk signal of demodulation.Signal rate with demodulation 50Gb/s is an example, and in the signal spectrum that the demodulation of DPSK demodulator is come out, the FSR of every road output is 50GHz, i.e. the two-way light path delay inequality of the interference that delay line interference (DLI, DelayLine Interferometer) forms is 20ps.
The utility model content
Therefore, the purpose of this utility model has been to provide a kind of device that is used for optical communication system DPSK modulation signal is carried out demodulation satisfying above-mentioned requirements, and DPSK demodulating equipment of the present utility model is based on, and the polarized light interference principle realizes.
The technical solution of the utility model is:
The device of optical differential phase shift keying demodulation of the present utility model, incident optical signal enters this device by collimater (101), and this device comprises and is set in turn in light path:
One polarization spectro element (10) is used for incident light is divided into the identical two-route wire polarised light in polarization direction;
One optical path delayed element (20) is used for above-mentioned two-route wire polarised light is divided into the orthogonal polarised light in polarization direction respectively, and the light path of this two-way polarised light has the delay inequality that is complementary with signal rate to be demodulated;
One polarization spectro element (30) is used for above-mentioned two-way polarised light and produces the two paths of signals light of interfering and being split up into complementation, obtain four road light signals altogether through behind the described polarization spectro element, and the signal that the parallel two-way light of direction of vibration carries is identical;
One polarization closes optical element (40), is used for being exported by two-way after the two-way light compositing with above-mentioned same signal.
Further, wherein can insert a light path light path tuned cell (114) on a light path or two light paths in the described optical path delayed element (20).
Further, described light path light path tuned cell (114) is the tuned cell of changeable refractive index or tuned cell or the refractive index and all variable tuned cell of thickness of variable thickness.
Further again, described tuned cell is to be connected in the adjustment module to carry out carrying out the machinery promotion on hot light adjusting or the displacement adjustment module or rotating and regulate.
Further embodiment one structure is: described polarization spectro element (10) is a birefringece crystal (102) and a wave plate (103) that is arranged at the one emitting light path, described optical path delayed element (20) is a birefringece crystal (104), described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106,107) that are arranged at its two emitting light path, and it is a birefringece crystal (108) that described polarization closes optical element (40).
Further embodiment two structures are: described polarization spectro element (10) is a birefringece crystal (102) and two wave plates (111,112) that are arranged at its two emitting light path, described optical path delayed element (20) is beam splitting successively and two birefringece crystals that close bundle (113,115) and a wave plate (116) that is arranged at its emitting light path, described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106,107) that are arranged at its two emitting light path, and it is a birefringece crystal (108) that described polarization closes optical element (40).
Further embodiment three structures are: described polarization spectro element (10) is a birefringece crystal (102) and two wave plates (111,112) that are arranged at its two emitting light path, described optical path delayed element (20) is beam splitting successively and the two pairs of PBS prisms (117,118 and 119,120) that close bundle and a wave plate (116) that is arranged at its emitting light path, described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106,107) that are arranged at its two emitting light path, and it is a birefringece crystal (108) that described polarization closes optical element (40).The PBS face (118,120) on the top of described pair of PBS prism (117,118 and 119,120) can be replaced by mirror surface.
Aforesaid polarization closes the two-way output light of optical element (40) by collimater (109,110) coupling output.
Structure of the present utility model can design with Free Space Optics, and temperature stability is good, and volume is little, is easy to realize modular advantage.
Expand, connect drive one optical medium on a micromachine or the relay, input to collimater (101) by cutting or cut out the demodulation incident optical signal switching that realizes two speed preceding setting of described optical path delayed element (20).
Expansion, at described incident optical signal the spectroscope of one 50%:50% is set, the device of five equilibrium two-way incident optical signal to two a described optical differential phase shift keying demodulation is realized the function of difference quadrature phase shift keying (DQPSK) demodulator.
The utility model adopts as above technical scheme, a kind of method that two-way is interfered the output optical path difference of controlling has been proposed, with compensating plate the light path light path is compensated, two-way can be interfered output light path delay inequality to control to the device of 1ps with interior optical differential phase shift keying demodulation.And the device of optical differential phase shift keying demodulation of the present utility model has adopted the Free Space Optics design, have good temperature stability, volume little, be easy to realize modular advantage.
Description of drawings
Fig. 1 is the structural representation of embodiment 1 of the present utility model;
Fig. 2 is the structural representation of embodiment 2 of the present utility model;
Fig. 3 is the structural representation of embodiment 3 of the present utility model.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
The utility model adopts the polarized light interference principle, to import light by polarization spectro element 10 and be divided into the identical polarised light of two-way polarization state, by one or one group of optical path delayed element 20 the two-route wire polarised light is divided into orthogonal polarised light respectively then, the orthogonal polarised light of this two-way has the delay inequality that is complementary with signal rate to be demodulated through these optical path delayed element 20 back light paths, produce to interfere at next polarization spectro element 30 places phase signal has been changed into strength signal, close the light signal that optical element 40 closes output demodulation behind the light by polarization at last.Along the light signal input direction polarization spectro element 10, optical path delayed element 20, polarization spectro element 30, polarization combiner element 40 are arranged successively; Input polarization beam splitter 10 is made up of a birefringece crystal and wave plate, and optical path delayed element 20 is made up of one or one group of birefringece crystal; Optical path delayed element 20 also can add two speculums by four PBS or two PBS and form; Polarization closes optical element 40 and is made up of a birefringece crystal.The orthogonal line polarisation of two-way is after passing through optical path delayed element 20, and the two-way light path has the delay inequality that is complementary with signal rate to be demodulated.The design of employing Free Space Optics, temperature stability is good, and volume is little, is easy to realize modular advantage.
Embodiment 1:
As shown in Figure 1, the light dpsk signal is entered by collimater 101, behind the birefringece crystal 102 by polarization spectro, is divided into the orthogonal polarised light in two bundle polarization directions, and after wherein a branch of light passed through a wave plate 103, the polarization direction of two-beam became identical; The identical two-beam in polarization direction is identical with the optical axis included angle of birefringece crystal 104, though o light is identical with the e light direction of propagation in this birefringece crystal 104, but because propagation velocity difference, has the delay inequality of 1bit by these birefringece crystal 104 back o light and e light light path, birefringece crystal 105 places that arrive polarization spectro produce the two paths of signals light of interfering and obtaining complementation, therefore obtain four road light signals altogether through behind the birefringece crystal 105 of polarization spectro, and the signal that the parallel two-way light of direction of vibration carries is identical; 106 and 107 are wave plate, and a road in the two-way light of same signal is through wave plate after vibration direction half-twist; The two-way light of same signal is combined into one road light by the birefringece crystal 108 that polarization closes light, is coupled into collimater 109 and 110 outputs, realizes the demodulation function of DPSK.This device realizes that optical path delayed part is that the birefringece crystal in the frame of broken lines 104 is realized among Fig. 1, the optical path difference of o light and e light is that refringence and the thickness by birefringece crystal o, e light decides, in order to realize the accurate adjusting of signal rate, and revise in real time because the demodulation off resonance that factors such as signal rate variation cause, birefringece crystal 104 can change the refringence of o, e light or changes crystal length and realize tuning with the birefringece crystal group of the band angle of wedge by mobile wherein a slice or several birefringece crystals change general thickness with heating with electrooptic crystal.
Fig. 2 and device shown in Figure 3 are the differentiation structures of Fig. 1, its principle and Fig. 1 are basic identical, can realize the dpsk signal demodulation function equally, o, the e light that its difference is among Fig. 1 the to produce optical path difference separation on the space of being unrealized, and Fig. 2 and Fig. 3 have the generation apart, are more conducive to the tuning of light path like this.
Embodiment 2:
As shown in Figure 2, the light dpsk signal is entered by collimater 101, behind the birefringece crystal 102 by polarization spectro, is divided into the orthogonal polarised light in two bundle polarization directions, and by behind the wave plate 111 and 112, the polarization direction of two-beam becomes identical two-beam respectively; The identical two-beam in polarization direction enters birefringece crystal 113 back and is divided into o light and e light respectively, and separation has spatially taken place o, e light, arrives birefringece crystal 115 places and closes bundle; Like this, o, e light light path in birefringece crystal 113 and birefringece crystal 115 has the delay inequality of 1bit, closing light behind the bundle produces through birefringece crystal 105 places that arrive polarization spectro after 45 ° of a wave plate 116 rotations and interferes and obtain complementary two paths of signals light, the back to close light part identical with Fig. 1, no longer repeat here.Fig. 2 device realizes that optical path delayed optical path delayed element 20 is that two birefringece crystals 113 and 115 in the frame of broken lines are realized, the optical path difference of o light and e light is that refringence and the thickness by birefringece crystal o, e light decides; In order to realize the tunable of optical path difference, can add light path light path tuned cell 114 at any a road or two-way of o, e light simultaneously realizes, this modulating part can insert refractive index and (or) element of variable thickness, to make the DPSK demodulating equipment realize tunable by changing this light path light path.Can adopt the mode of thermo-optical tunability, choose refractive index and (or) the temperature variant material of thickness makes tunable element, can change this road light path during variations in temperature; Also available mechanical mode promote the delay medium angle of wedge to or adopt and rotate the delay medium plain film, realize that the DPSK demodulating equipment realizes tunable.
Embodiment 3:
As shown in Figure 3, be to realize in the empty frame in Fig. 3 structure that at the difference of Fig. 3 structure and Fig. 2 structure optical path delayed optical path delayed element 20 can come birefringece crystal 113 in the alternate figures 2 with two PBS prisms 117 and 118, wherein 117 is PBS, 118 is PBS or speculum, the two PBS prisms 119 and 120 of same usefulness come the birefringece crystal 115 in the alternate figures 2, wherein 119 is PBS, and 120 is PBS or speculum.The optical path difference of this structure two-way light can by the difference in height between difference in height and PBS prism 119 and the PBS prism 120 between PBS prism 117 and the PBS prism 118 and between them the refractive index of medium determine that jointly the two-way light path needs the delay inequality of 1bit.In order to realize the tunable of optical path difference, can add light path light path tuned cell 114 equally at any a road or two-way of light simultaneously and realize that its principle is identical with the modulation system of Fig. 2.
Further, realize the switching that dual rate is regulated, drive certain thickness optical medium on available micromachine or the relay, by cutting light path or cutting out the switching that light path realizes two rate demodulation in order to make same DPSK demodulator.Particularly at Fig. 1 structure, can be in birefringece crystal 104 fronts or back incision or cut out the optical axis direction birefringece crystal identical and realize with the optical axis direction of birefringece crystal 104; Can or cut out a medium in the front or the back incision of light path light path tuned cell 114 at Fig. 2 and Fig. 3 realizes.Select the thickness and the refractive index of medium according to the speed of switching demodulation.
Further, at described incident optical signal the spectroscope of one 50%:50% is set, the device of five equilibrium two-way incident optical signal to two a described optical differential phase shift keying demodulation is realized the function of difference quadrature phase shift keying (DQPSK) demodulator.
The above embodiments have adopted the Free Space Optics design, have excellent temperature stability and less size.
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 (11)
1. the device of an optical differential phase shift keying demodulation, incident optical signal enters this device by collimater (101), it is characterized in that, and this device comprises and is set in turn in light path:
One polarization spectro element (10) is used for incident light is divided into the identical two-route wire polarised light in polarization direction;
One optical path delayed element (20) is used for above-mentioned two-route wire polarised light is divided into the orthogonal polarised light in polarization direction respectively, and the light path of this two-way polarised light has the delay inequality that is complementary with signal rate to be demodulated;
One polarization spectro element (30) is used for above-mentioned two-way polarised light and produces the two paths of signals light of interfering and being split up into complementation, obtain four road light signals altogether through behind the described polarization spectro element, and the signal that the parallel two-way light of direction of vibration carries is identical;
One polarization closes optical element (40), is used for being exported by two-way after the two-way light compositing with above-mentioned same signal.
2. the device of optical differential phase shift keying demodulation as claimed in claim 1 is characterized in that: wherein can insert a light path light path tuned cell (114) on a light path or two light paths in the described optical path delayed element (20).
3. the device of optical differential phase shift keying demodulation as claimed in claim 2 is characterized in that: described light path light path tuned cell (114) is the tuned cell of changeable refractive index or tuned cell or the refractive index and all variable tuned cell of thickness of variable thickness.
4. the device of optical differential phase shift keying demodulation as claimed in claim 3 is characterized in that: described tuned cell is to be connected in the adjustment module to carry out carrying out the machinery promotion on hot light adjusting or the displacement adjustment module or rotating and regulate.
5. the device of optical differential phase shift keying demodulation as claimed in claim 1, it is characterized in that: described polarization spectro element (10) is a birefringece crystal (102) and a wave plate (103) that is arranged at the one emitting light path, described optical path delayed element (20) is a birefringece crystal (104), described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106,107) that are arranged at its two emitting light path, and it is a birefringece crystal (108) that described polarization closes optical element (40).
6. the device of optical differential phase shift keying demodulation as claimed in claim 1, it is characterized in that: described polarization spectro element (10) is a birefringece crystal (102) and two wave plates (111 that are arranged at its two emitting light path, 112), described optical path delayed element (20) is beam splitting successively and two birefringece crystals (113 that close bundle, 115) and be arranged at the wave plate (116) of its emitting light path, described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106 that are arranged at its two emitting light path, 107), to close optical element (40) be a birefringece crystal (108) to described polarization.
7. the device of optical differential phase shift keying demodulation as claimed in claim 1, it is characterized in that: described polarization spectro element (10) is a birefringece crystal (102) and two wave plates (111 that are arranged at its two emitting light path, 112), described optical path delayed element (20) is beam splitting successively and two pairs of PBS prisms (117 that close bundle, 118 and 119,120) and be arranged at the wave plate (116) of its emitting light path, described polarization spectro element (30) is a birefringece crystal (105) and two wave plates (106 that are arranged at its two emitting light path, 107), to close optical element (40) be a birefringece crystal (108) to described polarization.
8. the device of optical differential phase shift keying demodulation as claimed in claim 1 is characterized in that: the PBS face (118,120) on the top of described pair of PBS prism (117,118 and 119,120) can be replaced by mirror surface.
9. as claim 1 or 5 or the device of 6 or 7 described optical differential phase shift keying demodulation, it is characterized in that: described polarization closes the two-way output light of optical element (40) by collimater (109,110) coupling output.
10. the device of optical differential phase shift keying demodulation as claimed in claim 1, it is characterized in that: connect drive one optical medium on a micromachine or the relay preceding setting of described optical path delayed element (20), input to collimater (101) by cutting or cut out the demodulation incident optical signal switching that realizes two speed.
11. the device of optical differential phase shift keying demodulation as claimed in claim 1 is characterized in that: one 50%: 50% spectroscope, the device of five equilibrium two-way incident optical signal to two a described optical differential phase shift keying demodulation are set at described incident optical signal.
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| CN2009201949348U CN201491031U (en) | 2009-09-15 | 2009-09-15 | Light difference phase shift keying demodulator |
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| CN2009201949348U CN201491031U (en) | 2009-09-15 | 2009-09-15 | Light difference phase shift keying demodulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075255A (en) * | 2010-11-26 | 2011-05-25 | 武汉邮电科学研究院 | Orthogonal polarized light delay interference device and optical communication system based on same |
| CN102333059A (en) * | 2010-07-06 | 2012-01-25 | 日本光进株式会社 | Demodulator and optical transceiver |
| CN110262054A (en) * | 2019-06-26 | 2019-09-20 | 中国空间技术研究院 | A kind of broad-band high-resolution Larger Dynamic range compensation of delay system and method |
| CN113783625A (en) * | 2021-07-08 | 2021-12-10 | 镇江希浦芯光电科技有限公司 | Miniaturized DPSK decodes receiver |
-
2009
- 2009-09-15 CN CN2009201949348U patent/CN201491031U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333059A (en) * | 2010-07-06 | 2012-01-25 | 日本光进株式会社 | Demodulator and optical transceiver |
| JP2012018225A (en) * | 2010-07-06 | 2012-01-26 | Opnext Japan Inc | Demodulator and optical transmitter/receiver |
| US8855502B2 (en) | 2010-07-06 | 2014-10-07 | Oclaro Japan, Inc. | Demodulator and optical transceiver |
| CN102075255A (en) * | 2010-11-26 | 2011-05-25 | 武汉邮电科学研究院 | Orthogonal polarized light delay interference device and optical communication system based on same |
| CN110262054A (en) * | 2019-06-26 | 2019-09-20 | 中国空间技术研究院 | A kind of broad-band high-resolution Larger Dynamic range compensation of delay system and method |
| CN110262054B (en) * | 2019-06-26 | 2021-09-07 | 中国空间技术研究院 | Broadband high-resolution large-dynamic-range delay compensation system and method |
| CN113783625A (en) * | 2021-07-08 | 2021-12-10 | 镇江希浦芯光电科技有限公司 | Miniaturized DPSK decodes receiver |
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Granted publication date: 20100526 Termination date: 20120915 |