CN102043255B - Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device - Google Patents
Polarization interference-based full-light OFDM signal multiplexing and demultiplexing device Download PDFInfo
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- CN102043255B CN102043255B CN2010105486003A CN201010548600A CN102043255B CN 102043255 B CN102043255 B CN 102043255B CN 2010105486003 A CN2010105486003 A CN 2010105486003A CN 201010548600 A CN201010548600 A CN 201010548600A CN 102043255 B CN102043255 B CN 102043255B
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Abstract
The invention relates to a device for multiplexing and demultiplexing an orthogonal frequency division multiplexing (OFDM) signal by using a polarization interference principle. A demultiplexing device consists of (N-1) basic structural units in a cascade mode, wherein N is the number of subcarriers of the OFDM signal, and an optical signal is subjected to polarization beam splitting, time delay and phase shift, and polarization interference in each basic structural unit; the demultiplexing device is inverted to serve as a multiplexing device; and the multiplexing device and the demultiplexing device realize operational function of inverse Fourier transform and Fourier transform on data sequence information carried in the optical signal. The device realizes the operational function of the inverse Fourier transform and the Fourier transform needed by OFDM signal multiplexing and demultiplexing in a full-light mode, and effectively eliminates the electronic processing speed limitation. Compared with devices in other full-light OFDM modes, the device has high expansibility, easily multiplexes and demultiplexes sub-channel signals with a large number of optical carriers, and has adjustable function and high flexibility.
Description
Technical field
The invention belongs to the signal processor in the optical communication system; Be specifically related to a kind of optical devices based on polarization interference; Accomplish Fast Fourier Transform (FFT) (FFT) and inverse transformation (IFFT) with full light form, realize the multiplexing and demultiplexing function of pair of orthogonal frequency division multiplexing (OFDM) signal.
Background technology
Along with the fast development with various communication services of popularizing of high speed internet, global transinformation just is being explosive growth, and this transmission performance to optical communication network has proposed requirements at the higher level.The light modulation techniques of research and application of advanced, very important to the transmission that realizes vast capacity, extra long distance light signal.
OFDM is a kind of multicarrier multiplex technique; Through data being gone here and there and conversion process in the system sending and receiving end; The high speed signal that transmits in the single channel link is converted into the multi-path low speed sub-channel signal of parallel modulation or demodulation; Have characteristics such as antijamming capability is strong, spectrum efficiency is high, the chromatic dispersion tolerance is good, very promising in the high speed long distance optical communication systems.OFDM has been widely used in wireless communication system, and it adopts electron device to carry out inverse fast Fourier transform and Fourier transform realizes signal multiplexing and demultiplexing, and the method realizes that cost is high, and receives the restriction of electric treatment speed.Realize OFDM with full light form, can effectively reduce of the requirement of system sending and receiving end, in the ultra high-speed optical signal Processing, have good application prospects the electron device operating rate.
The domestic and international at present research to full optical OFDM system makes certain gains.Like Chinese invention patent " full optical Fourier transform device, inverse transformer and a kind of ofdm system ", propose to adopt the planar waveguide coupler structure to realize full light discrete Fourier transformation and its inverse transformation computing; And for example document is (referring to Arthur James Lowery; " Design of arrayed-waveguide grating routers for use as optical OFDM demultiplexers; " Opt. Express 18; 14129-14143,2010) propose to realize identical function based on the waveguide optical grating routing infrastructure.Above-mentioned two kinds of apparatus structures are all comparatively complicated and do not have an expansion, realize difficulty to comprising when the more ofdm signal of number of sub carrier wave carries out multiplexing reconciliation multiplexing process, and cost is higher.In addition, utilize the thermo-optic effect of silica-based waveguides to introduce each branch road phase shift in the coupler structure, realize more complicated; Adjustable function, very flexible are fixed, do not had to waveguide optical grating route device structure.
Summary of the invention
The present invention proposes a kind of optical devices of realizing Fourier transform and inverse transform function thereof based on the polarization interference effect; Realize multiplexing and demultiplexing with full light mode to a plurality of subcarriers; Can effectively alleviate in the ofdm signal processing procedure of high speed optical communication system sending and receiving end the dependence of electron device, have advantages such as expansion is strong, dirigibility is good simultaneously.
A kind of ofdm signal Deplexing apparatus of realizing full light Fast Fourier Transform (FFT) of the present invention; It is characterized in that: mainly by N-1 elementary cell with
a level series connection form form; The k level has
individual parallelly connected elementary cell; K is positive integer and
, and N is the number of ofdm signal subcarrier; Each elementary cell comprises input optical fibre collimating apparatus, polarization beam apparatus, half-wave plate, phase delay device, polarization partial wave, wave multiplexer spare and output optical fibre collimating apparatus;
Said phase delay device is made up of time-delay crystal and phase-shift crystal, and said time-delay crystal is to instigate through producing the birefringece crystal in certain relative time delay between the pair of orthogonal linearly polarized light behind the polarization beam splitting; Said phase-shift crystal is meant the birefringece crystal of between the pair of orthogonal linearly polarized light behind the process time-delay crystal, introducing given reference phase difference;
Each elementary cell time-delay crystal length is in the k level:
Wherein, C is the light velocity, and
is the crystal birefringence rate variance;
The phase-shift crystal length of i elementary cell is in
of k level individual parallelly connected elementary cell:
; Wherein
;
is subchannel centre wavelength, and i is positive integer and
.
The present invention carries out like down conversion signal:
In the formula; N the equal interval sampling value of
expression system receiving terminal input ofdm signal
in symbol time T, i.e. time domain data sequence;
is
through the frequency domain data sequence after the OFFT; I.e.
sub-channel signal frequency component of unique correspondence in time T, m is the subchannel label.
Flashlight is coupled in the first order elementary cell by optical fiber collimator; The random polarization state signal is converted into the linearly polarized light of the two bundle quadratures that separate on the space through polarization beam apparatus and half-wave plate; After the two produces time-delay and phase shift relevant with wavelength through phase delay device; The component generation polarized light interference phenomenon that on identical polarization direction, has certain phase differential; The result of interference of different wavelengths of light is different, and the orhtogonal linear polarizaiton light through polarization partial wave, wave multiplexer spare output pair of separated is coupled into the next stage elementary cell respectively by collimating apparatus; Each elementary cell is all carried out polarization spectro, is introduced relative phase difference and polarized light interference process, the two-beam that separates on the output region a branch of input light that is incident to this structure; Thereby whole device will be treated a branch of flashlight of demultiplexing and be converted into N bundle flashlight after the processing of level elementary cell through
by the output of different fibers collimating apparatus, accomplish the separation of N number of sub-carrier; Optical fiber collimator assurance flashlight is realized the polarization interference process with the directional light mode, and will separate the sub-channel signal coupled into optical fibres that extract the back.
Said polarization beam apparatus can be the displacement crystal; With the flashlight beam splitting of inciding this structural unit is the pair of orthogonal linearly polarized light; Be ordinary light and unusual light (o light and e light), utilize half-wave plate can the two be converted into same polarization state, to realize the random polarization state Signal Processing; Said polarization partial wave, wave multiplexer spare can be made up of two displacement crystal and half-wave plate, realize the polarization interference result is exported with the pair of orthogonal linearly polarized light.
Based on same design; The invention allows for a kind of full light Fast Fourier Transform (FFT), ofdm signal Deplexing apparatus realized with adjustable function; It can realize the arbitrary subcarrier that is contained in the ofdm signal is carried out independent demultiplexing and has handoff functionality; It is characterized in that
: mainly be made up of
individual elementary cell cascade, N is the number of ofdm signal subcarrier; Each elementary cell comprises input optical fibre collimating apparatus, polarization beam apparatus, half-wave plate, phase delay device, polarization partial wave, wave multiplexer spare and output optical fibre collimating apparatus;
Said phase delay device is made up of time-delay crystal and the phase-shift crystal with adjustable structure, and said time-delay crystal is to instigate through producing the birefringece crystal in certain relative time delay between the pair of orthogonal linearly polarized light behind the polarization beam splitting;
The time-delay crystal length of the elementary cell of k level is:
Wherein, C is the light velocity, and
is the crystal birefringence rate variance;
Said phase-shift crystal is meant the birefringece crystal of between the pair of orthogonal linearly polarized light behind the process time-delay crystal, introducing given reference phase difference; Said phase-shift crystal is the wedge structure; Its optical axis is parallel to plane of crystal; And it is vertical with the light beam incident direction; A mechanical tunable arrangement control bundle that said wedge is vertically moved is passed through the net thickness of wedge; The net thickness of wedge structure phase-shift crystal is corresponding with number of sub carrier wave to be extracted in the k level elementary cell; Select value among its thickness
individual result, regulate the corresponding different i values of wedge structure and can confirm this net thickness at
.Wherein
;
is subchannel centre wavelength, and
is the crystal birefringence rate variance.
Equally based on this technical conceive; The present invention proposes a kind of ofdm signal multiplexer of realizing full light inverse fast Fourier transform; It is characterized in that: mainly by N-1 elementary cell with
a level series connection form form; The elementary cell of total
the individual parallel connection of k level; K is positive integer and
, and N is the number of ofdm signal subcarrier.Each elementary cell synthesizer spare is identical with the described Deplexing apparatus elementary cell of claim 1 synthesizer spare in the multiplexer, but signal just is inverted through the order of each device.Said full light ofdm signal multiplexer is N * 1 port devices, can regard the inverse process that full Optical Demultiplexing device is handled light signal as.Accomplish multiplexing N-1 the elementary cell of series connection form that need of N number of sub-carrier and form, the parameter setting of every grade of unit composition device is consistent with the homographic solution multiplexer, and it specifically carries out like down conversion signal:
In the formula;
expression system transmitting terminal inputs to the N subchannels data-signal of OIFFT computing module, i.e. frequency domain data sequence; The time domain data sequence that
obtains after conversion for
, n is the sampling instant of ofdm signal in a code-element period T.
The present invention has the following advantages: compare and use electron device that data are carried out Fourier transform and inverse transformation, the method is accomplished the multiplexing and demultiplexing of ofdm signal with full light mode, effectively alleviates in the high speed optical communication system electronics speed to the restriction of signal Processing; Contrast other full light OFDM mode; This implement device expansion is strong; Realize easily comprising the more multiplexing and demultiplexing processing of ofdm signal of light carrier number; And have adjustable function, its simplified structure can not realized the independent extraction to arbitrary sub-channel signal under the modifier composition condition, and dirigibility is strong; In addition, this device is made up of the passive device of cascade form, and structure is comparatively compact, realizes technical maturity.
Description of drawings
Fig. 1 is the function simplified schematic diagram of device elementary cell;
Fig. 2 (1) is the structural representation of the full Optical Demultiplexing device of OFDM;
Fig. 2 (2) is that the structure of elementary cell among Fig. 2 (1) is formed synoptic diagram;
Fig. 3 is the tunable arrangement structural representation that extracts a way carrier wave in the ofdm signal separately;
Fig. 4 recovers the structural representation with device entirely for OFDM;
Fig. 5 (1) and Fig. 5 (2) are two applying examples figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
Fig. 1 is the functional schematic of apparatus of the present invention elementary cell.Polarization beam apparatus carries out polarization spectro to input signal; Process time-delay and phase-shift processing obtain having two bunch polarized lights of phase differential; The polarization interference effect takes place in the two; Of equal value through the output result of multistage interference with the OFFT calculation function, when this device is inverted when using and OIFFT calculation function equivalence.The transport function of elementary cell is:
Wherein
produced by the time-delay crystal, and the time-delay crystal length is in the k level elementary cell:
C is the light velocity, and
is the crystal birefringence rate variance;
In the first stage k
of the base unit parallel to the i-th basic unit length of the crystal phase shift
, respectively:
Wherein
;
is subchannel centre wavelength, and i is positive integer and
.
K in the first grade
of the base unit parallel to the i-th basic unit crystal to generate the additional phase shift of the phase shift value
, respectively:
Fig. 2 is a structure drawing of device of the ofdm signal that comprises the N number of sub-carrier being realized full Optical Demultiplexing; N-1 the elementary cell of its level cascaded structure by
formed; It is 1 * N port devices; Each basic structural unit label is
, and its this elementary cell of expression is i the elementary cell (i is positive integer and
) of parallel connection in the k level in the cascaded structure.As shown in Figure 2; This device is coupled into first order elementary cell
with the receiving end input signal with the directional light form with optical fiber collimator 11, and each elementary cell constitutes by polarization beam splitting device, phase delay device and polarization partial wave, wave multiplexer spare.Polarization beam apparatus comprises displacement crystal 12 and half-wave plate 13; Birefringences take place and beam splitting is the two bunch polarized lights (o light and e light) of polarization state quadrature through displacement crystal 12 in incident light, and wherein one tunnel polarization state of light is consistent with another road emergent light polarization state behind half-wave plate 13 half-twists.The two-beam that spatially separates and have an identical polarization state is the phase delay device through being made up of time-delay crystal 14 and phase shift wafer 15 together; Produce given reference phase difference between the two; The component that on same polarization direction, has certain phase differential interferes; The result of interference of different wavelengths of light is different, will export with pair of orthogonal linearly polarized light form.Through polarization partial wave, wave multiplexer spare this result of interference is exported respectively: behind displacement crystal 12, form four bunch polarized lights through the emergent light behind the phase delay device; The linearly polarized light that will have the same spectra composition is converted into same polarization state with half-wave plate 13; By displacement crystal 12 it is closed bundle again, inject the next stage elementary cell for the pair of orthogonal linearly polarized light is coupled into by the optical fiber collimator 11 of two parallel connections respectively thereby this four bundle is photosynthetic.Flashlight is similar through the processing procedure and the first order of second level elementary cell, and the crystal 14 of just wherein delaying time is different with phase shift wafer 15 structural parameters, and concrete parameter is provided with according to formula (1) and formula (2).Each elementary cell is all carried out polarization spectro, is translated into the output of pair of orthogonal linearly polarized light after introducing time-delay and phase shift and polarized light interference a branch of flashlight of incident, and the identical but structural parameters of the device that constitutes elementary cells at different levels all there are differences.Emergent light is
after k level elementary cell is handled restraints; Of Fig. 2 (1); Whole device with the single channel ofdm signal that receives through
the level elementary cell handle the back demultiplexing be the output light signal of N subchannel respectively by optical fiber collimator 11 outputs, thereby realize the separation of N number of sub-carrier; Optical fiber collimator 11 assurance flashlights in the device are accomplished the polarization interference process with the directional light mode, and will separate the sub-channel signal coupled into optical fibres that extract the back.
Fig. 3 is the demodulation multiplexer structural representation with adjustable function; It can be regarded as a branch road in the global solution multiplexer shown in Fig. 2 (1) in essence; Difference is that the phase shift wafer in the elementary cells at different levels is the wedge structure; Cause that through regulating the wedge net thickness optical path difference changes, can make it that flashlight is produced different phase shifts, the various combination that obtains phase-shift value at different levels can be realized from an output port extracting the switching of arbitrary sub-channel signal; This moment, Deplexing apparatus required device number significantly reduced, and structure is also simplified relatively.Simplification device shown in Figure 3 can be on the basis that does not change whole device physical structure, through increasing the cascade number of elementary entitles, realizes more easily comprising the more ofdm signal demultiplexing of number of sub carrier wave, and flexible function, expansion is strong.
Fig. 4 is that the synthetic ofdm signal that comprises the N number of sub-carrier is recovered entirely and used structure drawing of device; N-1 the elementary cell of its level series connection by
formed, and is N * 1 port devices.The device of forming this device is identical with corresponding Deplexing apparatus, but signal processing is reverse, and promptly the implement device order inversion can be regarded the processing procedure of opposite direction shown in Fig. 2 (1) as.As shown in Figure 4; N number of sub-carrier after parallel modulation is imported N input port of this multiplexer simultaneously by optical fiber collimator 11; Adjacent two subcarriers are after identical first order elementary cell is handled; The N/2 bundle flashlight of outgoing is coupled into the next stage basic structural unit by optical fiber collimator 11 again; Emergent light after level is handled through
is synthetic ofdm signal, can directly be coupled into Optical Fiber Transmission.
Fig. 5 is the synoptic diagram of two concrete application implementation examples of the present invention.Shown in Fig. 5 (1), system's transmitting terminal and receiving end adopt the said device of Fig. 4 and Fig. 2 or Fig. 3 to realize the multiplexing and demultiplexing of ofdm signal respectively.Mode-locked laser 2 produces the ultrashort light pulse that repetition frequency equals OFDM adjacent sub-channel frequency interval; Be divided into the N road through power beam splitter 3 and get into N the input port of full recovery after again by modulator 4 loading data information with device 5; Through recover with the ofdm signal that obtains comprising the N subchannel behind the device entirely, go into optical fiber link 8 and transmit through optical band pass filter 6 and image intensifer 7 processing are laggard.Receive signal and behind image intensifer 7 and BPF. 6 filtering noises, get into the full Optical Demultiplexing device 9 of OFDM of accomplishing the OFFT calculation function, separate each sub-channel signal.If Deplexing apparatus 9 is 1 * 1 port devices with adjustable function as shown in Figure 3, then can only extract a subchannels signal separately.The output signal can be eliminated the interference of other channel under 10 controls of light sampling gate, its sampling rate equals chip rate, and each the subchannels signal that behind demultiplexing, extracts is by detuner 11 restoring data signals.
Shown in Fig. 5 (2); The transmitting terminal N of a system continuous wave laser 12 output N bundle continuous light carrier waves; Its frequency interval equals OFDM adjacent sub-carrier centre frequency at interval; Light carrier respectively through modulator 4 after loading data information under the symbol synchronization controlled condition, this N subchannels signal can obtain ofdm signal after closing bundle by power bundling device 13.System receiving terminal adopts above-mentioned Deplexing apparatus, and its signal processing is identical with system shown in Fig. 5 (1).
Above-mentioned each figure is descriptive but not determinate to illustration of the present invention, for example time-delay and phase shift not only can be produced by birefringece crystal in the polarized light interference process, also can be produced by polarization splitting prism and glass assembly; Introduce in the elementary cell of phase shift at the employing birefringece crystal; Can make two bunch polarized lights after polarization beam splitting and time-delay all introduce the relative phase shift value through phase-shift crystal, also can only make wherein a branch of light through this crystal and another bundle directly into being incident upon polarization partial wave, wave multiplexer spare; Also can constitute like polarization partial wave, wave multiplexer spare among Fig. 2 (2) by displacement crystal and roof prism assembly; And for example system's transmitting terminal light pulse sequence can combine external modulator to obtain by single continuous wave laser among Fig. 5 (1), and wherein external modulator receives Clock dividers control to keep synchronous with data clock; The N of a transmitting terminal independent continuous light carrier wave can be adopted accurate spectrum cutting technique to obtain by the pectination spectrum to frequency lock among Fig. 5 (2).
Claims (5)
1. fully optical orthogonal frequency division multiplexing signal Deplexing apparatus based on polarization interference is characterized in that: mainly by N-1 elementary cell with log
2N level series connection form is formed, and the k level has 2
K-1Individual parallelly connected elementary cell, k be positive integer and ∈ [1, log
2N], N is the number of orthogonal frequency-division multiplex singal subcarrier; Each elementary cell comprises input optical fibre collimating apparatus, polarization beam apparatus, half-wave plate, phase delay device, polarization partial wave wave multiplexer spare and output optical fibre collimating apparatus;
Said phase delay device is made up of time-delay crystal and phase-shift crystal, and said time-delay crystal is to instigate through producing the birefringece crystal in certain relative time delay between the pair of orthogonal linearly polarized light behind the polarization beam splitting; Said phase-shift crystal is meant the birefringece crystal of between the pair of orthogonal linearly polarized light behind the process time-delay crystal, introducing given reference phase difference;
Each elementary cell time-delay crystal length is in the k level:
Wherein, c is the light velocity, and Δ n is the crystal birefringence rate variance; T is a symbol time;
In 2 of k level
K-1The phase-shift crystal length of i elementary cell is in the individual parallelly connected elementary cell:
Q=2 wherein
K-1, 2
K-1+ 1 ... 2
k-1, λ is a subchannel centre wavelength, and i is positive integer and ∈ [1,2
K-1].
2. the fully optical orthogonal frequency division multiplexing signal Deplexing apparatus based on polarization interference according to claim 1; It is characterized in that: said polarization beam apparatus is the displacement crystal; With the flashlight beam splitting of inciding this elementary cell is the pair of orthogonal linearly polarized light; Be ordinary light and unusual light (o light and e light), utilize half
Wave plate can be converted into same polarization state with the two, realizes the random polarization state Signal Processing.
3. the fully optical orthogonal frequency division multiplexing signal Deplexing apparatus based on polarization interference according to claim 1 and 2; It is characterized in that: said polarization partial wave wave multiplexer spare is made up of two displacement crystal and half-wave plate, realizes the polarization interference result is exported with the pair of orthogonal linearly polarized light.
4. the fully optical orthogonal frequency division multiplexing signal Deplexing apparatus based on polarization interference is characterized in that: mainly by log
2N elementary cell cascade formed, and N is the number of orthogonal frequency-division multiplex singal subcarrier; Each elementary cell comprises input optical fibre collimating apparatus, polarization beam apparatus, half-wave plate, phase delay device, polarization partial wave wave multiplexer spare and output optical fibre collimating apparatus;
Said phase delay device is made up of time-delay crystal and the phase-shift crystal with adjustable structure, and said time-delay crystal is to instigate through producing the birefringece crystal in certain relative time delay between the pair of orthogonal linearly polarized light behind the polarization beam splitting;
The time-delay crystal length of the elementary cell of k level is:
Wherein, c is the light velocity, and Δ n is the crystal birefringence rate variance; T is a symbol time;
Said phase-shift crystal is meant the birefringece crystal of between the pair of orthogonal linearly polarized light behind the process time-delay crystal, introducing given reference phase difference; Said phase-shift crystal is the wedge structure; Its optical axis is parallel to plane of crystal, and vertical with the light beam incident direction, and a mechanical tunable arrangement control bundle that said wedge is vertically moved is passed through the net thickness of wedge; The net thickness of wedge structure phase-shift crystal is corresponding with number of sub carrier wave to be extracted in the k level elementary cell, and its thickness exists
2
K-1Select value among the individual result, regulate the corresponding different i values of wedge structure and can confirm this net thickness, wherein q=2
K-1, 2
K-1+ 1 ... 2
k-1, λ is a subchannel centre wavelength, and Δ n is the crystal birefringence rate variance.
5. fully optical orthogonal frequency division multiplexing signal multiplexing device based on polarization interference is characterized in that: mainly by N-1 elementary cell with log
2N level series connection form is formed, and the k level is total
The elementary cell of individual parallel connection, k be positive integer and ∈ [1, log
2N], N is the number of orthogonal frequency-division multiplex singal subcarrier; Each elementary cell synthesizer spare is identical with the described Deplexing apparatus elementary cell of claim 1 synthesizer spare in the multiplexer, but signal just is inverted through the order of each device.
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| CN102710573B (en) * | 2012-04-27 | 2015-06-24 | 武汉邮电科学研究院 | Method for performing OFDM (orthogonal frequency division multiplexing) demultiplexing in radio frequency domain and application system thereof |
| CN103297169B (en) * | 2013-06-26 | 2015-06-24 | 武汉邮电科学研究院 | OFDM-PON long-distance transmission method based on comb-shaped light source regeneration technology |
| KR102559580B1 (en) * | 2016-08-17 | 2023-07-25 | 삼성전자주식회사 | OPA(Optical Phased Array) for beam steering, and LiDAR(Light Detection And Ranging) system comprising the same OPA |
| CN111360397A (en) * | 2019-08-14 | 2020-07-03 | 方强 | Dodging optical system based on multiple optical fiber output laser modules and processing head |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694233A (en) * | 1996-07-23 | 1997-12-02 | Macro-Vision Communications, Llc | Switchable wavelength router |
| CN1367593A (en) * | 2002-03-08 | 2002-09-04 | 中国科学院上海光学精密机械研究所 | Birefingent cascade polarized interference old-even signal separator and its preparation method |
| CN101645739A (en) * | 2009-09-14 | 2010-02-10 | 武汉邮电科学研究院 | Polarization demultiplexing device, polarization multiplexing light communication system and implementation method |
-
2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694233A (en) * | 1996-07-23 | 1997-12-02 | Macro-Vision Communications, Llc | Switchable wavelength router |
| CN1367593A (en) * | 2002-03-08 | 2002-09-04 | 中国科学院上海光学精密机械研究所 | Birefingent cascade polarized interference old-even signal separator and its preparation method |
| CN101645739A (en) * | 2009-09-14 | 2010-02-10 | 武汉邮电科学研究院 | Polarization demultiplexing device, polarization multiplexing light communication system and implementation method |
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