CN102932070B - Quick tunable phase shift keying signal demodulator - Google Patents
Quick tunable phase shift keying signal demodulator Download PDFInfo
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- CN102932070B CN102932070B CN201210445148.7A CN201210445148A CN102932070B CN 102932070 B CN102932070 B CN 102932070B CN 201210445148 A CN201210445148 A CN 201210445148A CN 102932070 B CN102932070 B CN 102932070B
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- total reflection
- grin lens
- reflection device
- phase shift
- tunable phase
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Abstract
The invention relates to a quick tunable phase shift keying signal demodulator. The demodulator comprises an optical circulator, a self-focusing lens and a total reflection device, wherein the optical circulator, the self-focusing lens and the total reflection device are arranged sequentially from left to right, a Number 11 port of the optical circulator is connected to a demodulated optical signal, the optical signal is output to the self-focusing lens by a Number 12 port of the optical circulator, the total reflection device is arranged at the right of the self-focusing lens, the self-focusing lens and the total reflection device are arranged on installation racks, the optical signal is subjected to primary reflection at the end face of the self-focusing lens, other transmitted light is subjected to secondary reflection through the total reflection device and returns to and enters the self-focusing lens, and two beams of transmitted light are subjected to interference in the self-focusing lens and are output through a Number 13 port of the optical circulator. By the aid of the demodulator, the distance between two installation racks is adjusted quickly and the quick tuning of the demodulator is achieved.
Description
Technical field
The present invention relates to a kind of fast tunable phase shift keyed signal demodulator.
Background technology
Phase shift keyed signal is the widely used a kind of modulation format of high speed optical communication system, comprises differential phase keying (DPSK) signal (DPSK), four phase place phase shift keyed signals (QPSK), and quadrature amplitude modulation signal (QAM) etc.Along with improving constantly of traffic rate, phase shift keying (PSK) signal becomes the mainstream technology of more than 40Gb/s high speed optical communication.In the system of application phase shift keying (PSK) signal, modulator and demodulator are two Primary Components.Phase shift keying (PSK) demodulator of PM signal PM known both at home and abroad mainly contains at present:
1. based on the demodulator of Mach-Zeng Deer principle of interference, as shown in Figure 1. first psk signal to be demodulated is divided into two-way through a beam splitter 10, two paths of signals interferes arm 12,13 by two with 1 bit delay inequality, and at bundling device 14 internal interference, psk signal is transformed into amplitude-modulated signal, realizes demodulation.
2. based on the demodulator of phase place-polarization conversion, as shown in Figure 2, first utilize Polarization Controller 15 to change the polarization state of light signal to be demodulated, make the polarization state of flashlight to be demodulated and polarization maintaining optical fibre 16 two polarization axles at 45 °.Because the quadrature component amplitude of flashlight to be demodulated on two polarization axles is equal, transmission speed is unequal, time delay is produced in output two quadrature components of polarization maintaining optical fibre 16, export polarization state at 45 ° or-45 ° with input polarization state, convert PoLSK signal to, after polarization beam apparatus 17, PoLSK signal is transformed into amplitude-modulated signal, realizes demodulation.
3. utilize filter to carry out the method for demodulation, as shown in Figure 3, adopt Gaussian linear filter and fiber grating filter 18 to realize carrying out demodulation to phase shift keying (PSK) signal as frequency discriminator.
4. adopt the method for four wave mixing (FWM) demodulation, as shown in Figure 4, flashlight and pump light are after 2 × 2 couplers 19, forward and reverse transmission in fiber optic loop, four wave mixing (FWM) occurs for nonlinear dielectric 20 in ring and GVD (Group Velocity Dispersion) medium 21 and group's dispersion postpones, by the signal loading in flashlight in the another one frequencies of light produced by four wave mixing (FWM).Can to different rates signal receiving by the wavelength of adjustment pump light.
Existing phase shift keying (PSK), although demodulator of PM signal PM can both realize demodulation function, realize tuning all more difficult fast.Method 1 and 2 is all the length needing to change optical fiber, and tuned speed is slow.Method 3 is a kind of frequency discriminator but not phase discriminator in essence, can not be tuning.Method 4 needs to change pump wavelength and realizes tuning, and cost is high, technical difficulty is large.The present invention is intended to propose a kind of fast tuning method to phase shift keying during rate variation (PSK) signal and device.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the fast tunable phase shift keyed signal demodulator that a kind of structure is simple, easy to use.
Fast tunable phase shift keyed signal demodulator of the present invention, comprise optical circulator, GRIN Lens and total reflection device, described optical circulator, GRIN Lens and total reflection device are arranged in order by left-to-right, No. 11 ports of optical circulator connect demodulated light signal, No. 12 ports of optical signals optical circulator output in GRIN Lens, the right side of GRIN Lens arranges total reflection device, total reflection device and GRIN Lens are all arranged on installing rack, light signal is in the end face generation primary event of GRIN Lens, remaining transmitted light is through total reflection device secondary reflection, return and enter GRIN Lens, two bundle reverberation interfere in GRIN Lens, by the distance between quick adjustment two installing racks, realize the tuning fast of demodulator, and exported by No. 13 ports of optical circulator.
Fast tunable phase shift keyed signal demodulator of the present invention, described total reflection device is completely reflecting mirror or faraday rotation mirror.
Fast tunable phase shift keyed signal demodulator of the present invention, described installing rack is optical adjusting frame.
Fast tunable phase shift keyed signal demodulator of the present invention, described total reflection device is fixed on installing rack by piezoelectric ceramic, by changing the control voltage of piezoelectric ceramic, piezoelectric ceramic being produced flexible, realizing the distance between quick adjustment two installing racks.
Fast tunable phase shift keyed signal demodulator of the present invention, the installing rack of described GRIN Lens and total reflection bottom of device is all fixed on motorized precision translation stage, realizes the distance between quick adjustment two installing racks by motorized precision translation stage.
Fast tunable phase shift keyed signal demodulator of the present invention, the installing rack of described GRIN Lens and total reflection bottom of device is all fixed on motorized precision translation stage, total reflection device is fixed on installing rack by piezoelectric ceramic, jointly realizes the distance between quick adjustment two installing racks by motorized precision translation stage and piezoelectric ceramic.
Fast tunable phase shift keyed signal demodulator of the present invention, the input end face of described GRIN Lens plates the high antireflection film that one deck prevents extra reflection, the output end face of GRIN Lens plates the anti-reflection film that one deck has certain reflectivity and transmissivity, make the interference of primary event and secondary reflection light the strongest.
Compared with prior art beneficial effect of the present invention is:
1) because light signal completes interference to change strength information in GRIN Lens, compared with MZ type fibre optic interferometer, the interference effect by phase jitter is less;
2) the present invention adopts in light-air-light and transmits, and light is back to again in optical fiber after shining in air from optical fiber, only need by after beam path alignment, and the distance between adjustment GRIN Lens and completely reflecting mirror can realize the demodulation to different rates psk signal;
3) the quick tuning demodulation by adopting motorized precision translation stage can realize different rates psk signal on a large scale;
4) piezoelectric ceramic is adopted can to realize the interior quick tuning demodulation of different rates psk signal changed among a small circle;
5) this apparatus structure is compact, light, simple to operate;
6) dissimilar psk signal is applicable to.
Accompanying drawing explanation
Fig. 1 is the structural representation based on the demodulator of MZM interferometer in prior art;
Fig. 2 is the structural representation based on the demodulator of polarization in prior art;
Fig. 3 is the structural representation based on the demodulator of filter in prior art;
Fig. 4 is the structural representation based on the psk signal demodulator of four wave mixing (FWM) in prior art;
Fig. 5 is the structural representation of a kind of fast tunable phase shift keyed signal demodulator described in the embodiment of the present invention 1;
Fig. 6 is the structural representation of a kind of fast tunable phase shift keyed signal demodulator described in the embodiment of the present invention 2;
Fig. 7 is the structural representation of a kind of fast tunable phase shift keyed signal demodulator described in the embodiment of the present invention 3;
Fig. 8 is that in a kind of fast tunable phase shift keyed signal demodulator described in the embodiment of the present invention, total reflection device is the structural representation of faraday rotation mirror.
In figure:
1, optical circulator; 2, GRIN Lens; 3, total reflection device; 4, installing rack; 5, piezoelectric ceramic; 6, motorized precision translation stage.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
As shown in Figure 5, a kind of fast tunable phase shift keyed signal demodulator, comprise optical circulator 1, GRIN Lens 2 and total reflection device 3, described optical circulator 1, GRIN Lens 2 and total reflection device 3 are arranged in order by left-to-right, No. 11 ports of optical circulator 1 connect demodulated light signal, No. 12 ports of optical signals optical circulator 1 output in GRIN Lens 2, the right side of GRIN Lens 2 arranges total reflection device 3, total reflection device 3 and GRIN Lens 2 are all arranged on installing rack 4, light signal is in the end face generation primary event of GRIN Lens 2, remaining transmitted light is through total reflection device 3 secondary reflection, return and enter GRIN Lens 2, two bundle reverberation interfere in GRIN Lens 2, by the distance between quick adjustment two installing racks 4, realize the tuning fast of demodulator, and exported by No. 13 ports of optical circulator 1.
Fast tunable phase shift keyed signal demodulator of the present invention, described total reflection device 3 is completely reflecting mirror or faraday rotation mirror, as shown in Figure 8: total reflection device 3 adopts faraday rotation mirror.
Fast tunable phase shift keyed signal demodulator of the present invention, described installing rack 4 is optical adjusting frame.
Fast tunable phase shift keyed signal demodulator of the present invention, described total reflection device 3 is fixed on installing rack 4 by piezoelectric ceramic 5, by changing the control voltage of piezoelectric ceramic 5, piezoelectric ceramic 5 being produced flexible, realizing the distance between quick adjustment two installing racks 4.
Fast tunable phase shift keyed signal demodulator of the present invention, the input end face of described GRIN Lens 2 plates the high antireflection film that one deck prevents extra reflection, the output end face of GRIN Lens 2 plates the anti-reflection film that one deck has certain reflectivity and transmissivity, make the interference of primary event and secondary reflection light the strongest.
Embodiment 2
As shown in Figure 6, difference from Example 1 is: the installing rack 4 bottom described GRIN Lens 2 and total reflection device 3 is all fixed on motorized precision translation stage 6, realizes the distance between quick adjustment two installing racks 4 by motorized precision translation stage 6.
Embodiment 3
As shown in Figure 7, difference from Example 1 is: the installing rack 4 bottom described GRIN Lens 2 and total reflection device 3 is all fixed on motorized precision translation stage 6, total reflection device 3 is fixed on installing rack 4 by piezoelectric ceramic 5, jointly realizes the distance between quick adjustment two installing racks 4 by motorized precision translation stage 6 and piezoelectric ceramic 5.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (7)
1. a fast tunable phase shift keyed signal demodulator, comprise optical circulator (1), GRIN Lens (2) and total reflection device (3), it is characterized in that: described optical circulator (1), GRIN Lens (2) and total reflection device 3 are arranged in order by left-to-right, No. 11 ports of optical circulator (1) connect demodulated light signal, No. 12 ports of optical signals optical circulator (1) output in GRIN Lens (2), the right side of GRIN Lens (2) arranges total reflection device (3), total reflection device (3) and GRIN Lens (2) are all arranged on installing rack (4), light signal is in the end face generation primary event of GRIN Lens (2), remaining transmitted light is through total reflection device (3) secondary reflection, return and enter GRIN Lens (2), two bundle reverberation interfere in GRIN Lens (2), by the distance between quick adjustment two installing racks (4), realize the tuning fast of demodulator, and exported by No. 13 ports of optical circulator (1).
2. fast tunable phase shift keyed signal demodulator according to claim 1, is characterized in that: described total reflection device (3) is completely reflecting mirror or faraday rotation mirror.
3. fast tunable phase shift keyed signal demodulator according to claim 1, is characterized in that: described installing rack (4) is optical adjusting frame.
4. fast tunable phase shift keyed signal demodulator according to claim 1, it is characterized in that: described total reflection device (3) is fixed on installing rack (4) by piezoelectric ceramic (5), by changing the control voltage of piezoelectric ceramic (5), piezoelectric ceramic (5) is produced flexible, realize the distance between quick adjustment total reflection device (3) and GRIN Lens (2).
5. fast tunable phase shift keyed signal demodulator according to claim 1, it is characterized in that: the installing rack (4) of described GRIN Lens (2) and total reflection device (3) bottom is all fixed on motorized precision translation stage (6), realizes the distance between quick adjustment total reflection device (3) and GRIN Lens (2) by motorized precision translation stage (6).
6. fast tunable phase shift keyed signal demodulator according to claim 1, it is characterized in that: the installing rack (4) of described GRIN Lens (2) and total reflection device (3) bottom is all fixed on motorized precision translation stage (6), total reflection device (3) is fixed on installing rack (4) by piezoelectric ceramic (5), jointly realizes the distance between quick adjustment total reflection device (3) and GRIN Lens (2) by motorized precision translation stage (6) and piezoelectric ceramic (5).
7. fast tunable phase shift keyed signal demodulator according to claim 1, it is characterized in that: the input end face of described GRIN Lens (2) plates the high antireflection film that one deck prevents extra reflection, the output end face of GRIN Lens (2) plates the anti-reflection film that one deck has certain reflectivity and transmissivity, makes the interference of primary event and secondary reflection light the strongest.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828370A (en) * | 2006-03-24 | 2006-09-06 | 南开大学 | Optical fiber signal modulator based on echo interference effect |
| CN101324444A (en) * | 2008-07-30 | 2008-12-17 | 哈尔滨工程大学 | Simplifying type multiplexing white light interference optical fiber sensing demodulating equipment |
| CN101350678A (en) * | 2008-09-05 | 2009-01-21 | 清华大学 | Apparatus and method for compensating polarization membrane dispersion in network for forming light control microwave beam |
| CN101799548A (en) * | 2010-02-23 | 2010-08-11 | 北京交通大学 | All-fiber velocity measurement system and phase velocity measurement method |
| CN102352963A (en) * | 2011-10-09 | 2012-02-15 | 中国计量学院 | Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline |
-
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- 2012-11-09 CN CN201210445148.7A patent/CN102932070B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828370A (en) * | 2006-03-24 | 2006-09-06 | 南开大学 | Optical fiber signal modulator based on echo interference effect |
| CN101324444A (en) * | 2008-07-30 | 2008-12-17 | 哈尔滨工程大学 | Simplifying type multiplexing white light interference optical fiber sensing demodulating equipment |
| CN101350678A (en) * | 2008-09-05 | 2009-01-21 | 清华大学 | Apparatus and method for compensating polarization membrane dispersion in network for forming light control microwave beam |
| CN101799548A (en) * | 2010-02-23 | 2010-08-11 | 北京交通大学 | All-fiber velocity measurement system and phase velocity measurement method |
| CN102352963A (en) * | 2011-10-09 | 2012-02-15 | 中国计量学院 | Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline |
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