CN109560877A - Communication system and method are directly detected based on the received dual-polarization QAM modulation of K-K - Google Patents
Communication system and method are directly detected based on the received dual-polarization QAM modulation of K-K Download PDFInfo
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- 101100028790 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PBS2 gene Proteins 0.000 claims abstract description 25
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- 101100028789 Arabidopsis thaliana PBS1 gene Proteins 0.000 claims abstract description 22
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- 239000013307 optical fiber Substances 0.000 claims description 44
- 101100448366 Arabidopsis thaliana GH3.12 gene Proteins 0.000 claims description 30
- 101100281642 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FRM2 gene Proteins 0.000 claims description 21
- 101000988141 Homo sapiens Purkinje cell protein 4-like protein 1 Proteins 0.000 claims description 20
- 102100029201 Purkinje cell protein 4-like protein 1 Human genes 0.000 claims description 20
- 101100397135 Arabidopsis thaliana IQM2 gene Proteins 0.000 claims description 18
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention provides one kind directly to detect communication system based on the received dual-polarization QAM modulation of K-K, including signal receiving end and signal transmitting terminal, the signal receiving end is connect with the signal transmitting terminal by transmission link, and the signal receiving end includes laser, beam splitter, frequency shifter, the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2, the first photoelectric detector PD 1, the second photoelectric detector PD 2, the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and data decision unit and first annular device C1.The present invention also provides one kind directly to detect communication means based on the received dual-polarization QAM modulation of K-K.The beneficial effects of the present invention are: on the one hand, greatly improving spectrum efficiency；On the other hand, power consumption is significantly reduced, so that short haul connection should be suitable for.
Description
Technical field
The present invention relates to short distance optical communication field, more particularly to one kind are direct based on the received dual-polarization QAM modulation of K-K
Detect communication system and method.
Background technique
The development of cloud service and application based on data center, so that demand of the short haul connection to frequency spectrum constantly increases
It is long.By today, data center (DC) communication flows has been the chief component of global communication flow, is referred to according to Cisco's global cloud
Number prediction, the information interaction amount of 2020DC are up to 15Zbit, increased twice compared to 2017.Among these, nearly 77%
Communication interacted inside data center, the behaviors such as main generation, storage, processing and verifying including data.It is huge
Information interaction amount have stimulated to high-speed, low cost, the demand of the short distance communication scheme of low-power consumption.Based on data center
Size and capacity status, with single mode optical fiber (SMF) dispose data center internet be mainly distributed on 500m to 10km away from
From in range, in this case, using traditional coherent communication scheme, subsequent high-speed dsp processing module power consumption is excessive, realizes
Cost is excessively high, this makes traditional coherent optical communication package be difficult directly to apply to short haul connection.However, coherent detection scheme can
To carry out signal modulation on four dimensions, meanwhile, the introducing of local oscillator light can greatly improve the sensitivity of receiver, be real
Now one of effective alternative of high speed short haul connection.Therefore, document proposes by using the design of reasonable structure and light
It learns component to go to replace complexity DSP (Digital Signal Processing, Digital Signal Processing) module, to drop significantly
Low-power consumption.But on the other hand, coherent reception needs frequency mixer and four pairs of balanced detectors, also limits while increasing cost
The integrated level of device is made.Therefore, such as the mode how directly detected, dual-polarization QAM is realized in conjunction with low complex degree DSP
The transmission of (Quadrature Amplitude Modulation, quadrature amplitude modulation) signal is an important research direction.
Based on above-mentioned market-driven and technological challenge, related scientific research personnel propose a series of solutions.Reducing DSP
In terms of complexity, by making system work near 0 dispersion wavelength, the influence of dispersion can be ignored；Made using same laser
Local oscillator light and signal carrier, and phase matched is carried out to signal road and local oscillator optical path, carrier recovery block in DSP can be substituted；
By feedback control Polarization Controller, the compensation of polarization aliasing is realized.But the feedback control of Aliasing compensation is polarized in above scheme
Amount up to three is realized complex.In addition, received and Kramers-Kronig (K-K) algorithm by combining Stokes, it can be with
Realize that dual-polarization QAM signal transmits in a manner of directly detecting.But the program needs complicated algorithm to realize polarization aliasing
Compensation, meanwhile, receive and structure it is also complex.
Based on this, a kind of more simple, effective polarization Aliasing compensation scheme how is proposed, in conjunction with Kramers-Kronig
Receive, it is only necessary to two PD (photodetector), can be realized dual-polarization QAM signal transmission, be those skilled in the art institute urgently
The technical issues of solution.
Summary of the invention
In order to solve the problems in the prior art, it is straight based on the received dual-polarization QAM modulation of K-K that the present invention provides one kind
Connect detection communication system and method.
The present invention provides one kind directly to detect communication system based on the received dual-polarization QAM modulation of K-K, including signal connects
Receiving end and signal transmitting terminal, the signal receiving end are connect with the signal transmitting terminal by transmission link, and the signal receives
End includes laser, beam splitter, frequency shifter, the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2, the first photodetection
Device PD1, the second photoelectric detector PD 2, the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and data are sentenced
Certainly unit and first annular device C1, the output end of the laser are connect with the input terminal of the beam splitter, the beam splitter
Local oscillator light output end is connect with the input terminal of the frequency shifter, the output end of the frequency shifter and first polarization beam apparatus
The input terminal of PBS1 connects, the X polarization light output end of the first polarization beam apparatus PBS1 and first photoelectric detector PD 1
Input terminal connection, Y polarization light output end and second photoelectric detector PD 2 of the first polarization beam apparatus PBS1 it is defeated
Enter end connection, the signal transmitting terminal includes Polarization Controller PC, the second circulator C2, third polarization beam apparatus PBS3, first
I/Q modulator IQM1, the first faraday rotation mirror FRM1, the second I/Q modulator IQM2, the second faraday rotation mirror FRM2 and polarization
Bundling device PBC, the signal carrier output end of the beam splitter are connect with 1 port of the first annular device C1, first ring
2 ports of shape device C1 are connect by the transmission link with the Polarization Controller PC, the Polarization Controller PC and described the
2 ports of second ring device C2 connect, the input terminal of 3 ports of the second circulator C2 and the third polarization beam apparatus PBS3
The X polarization light output end of connection, the third polarization beam apparatus PBS3 is connect with the input terminal of the first I/Q modulator IQM1,
The output end of the first I/Q modulator IQM1 is connect with the input terminal of the first faraday rotation mirror FRM1, first method
The output end of revolving mirror FRM1 and the input terminal of the polarization beam combiner PBC is drawn to connect, the third polarization beam apparatus PBS3
Y polarization light output end connect with the input terminal of the second I/Q modulator IQM2, the output of the second I/Q modulator IQM2
End is connect with the input terminal of the second faraday rotation mirror FRM2, the output end of the second faraday rotation mirror FRM2 and institute
State the input terminal connection of polarization beam combiner PBC, 1 end of the output end of the polarization beam combiner PBC and the second circulator C2
Mouth connection, 3 ports of the first annular device C1 are connect with the input terminal of the second polarization beam apparatus PBS2, and described second partially
The X polarization light output end of vibration beam splitter PBS2 is connect with the input terminal of first photoelectric detector PD 1, second polarization point
The Y polarization light output end of beam device PBS2 is connect with the input terminal of second photoelectric detector PD 2, first photodetector
The output end of PD1 is connect with the input terminal of the first KK converting unit KK1, the output end of second photoelectric detector PD 2
It is connect with the input terminal of the 2nd KK converting unit KK2, the first KK converting unit KK1, the 2nd KK converting unit KK2
Output end is connect with the input terminal of the carrier auxiliary and data decision unit respectively.
As a further improvement of the present invention, the transmission link is single mode optical fiber.
As a further improvement of the present invention, the signal transmitting terminal further includes third circulator C3 and fourth annular device
C4,1 port of the third circulator C3 are connect with the output end of the second I/Q modulator IQM2, the third circulator C3
2 ports connect with the second faraday rotation mirror FRM2,3 ports of the third circulator C3 and the polarization beam combiner
The input terminal of PBC connects；1 port of the fourth annular device C4 is connect with the output end of the first I/Q modulator IQM1, institute
2 ports for stating fourth annular device C4 are connect with the first faraday rotation mirror FRM2,3 ports of the fourth annular device C4 with
The input terminal of the polarization beam combiner PBC connects.
As a further improvement of the present invention, lead between the third polarization beam apparatus PBS3, the first I/Q modulator IQM1
Cross polarization maintaining optical fibre connection, the first I/Q modulator IQM1, fourth annular device C4 1 port 1 between by polarization maintaining optical fibre connection,
Pass through polarization maintaining optical fibre between 2 ports of the fourth annular device C4, the first faraday rotation mirror FRM2 to connect, the fourth annular
Pass through polarization maintaining optical fibre between 3 ports of device C4, polarization beam combiner PBC to connect, the third polarization beam apparatus PBS3, the 2nd IQ tune
Between device IQM2 processed by polarization maintaining optical fibre connect, the second I/Q modulator IQM2, third circulator C3 1 port 1 between lead to
Polarization maintaining optical fibre connection is crossed, passes through polarization maintaining optical fibre company between 2 ports of the third circulator C3, the second faraday rotation mirror FRM2
It connects, passes through polarization maintaining optical fibre between 3 ports of the third circulator C3, polarization beam combiner PBC and connect.
As a further improvement of the present invention, it is connected between the beam splitter, frequency shifter by polarization maintaining optical fibre, described first
It is connected between 3 ports of circulator C1, the second polarization beam apparatus PBS2 by polarization maintaining optical fibre.
As a further improvement of the present invention, described that communication system is directly detected based on the received dual-polarization QAM modulation of K-K
Work in O wave band, wavelength 1260-1360nm.
The present invention also provides one kind directly to detect communication means based on the received dual-polarization QAM modulation of K-K, based on above-mentioned
Any one of described in based on the received dual-polarization QAM modulation of K-K directly detect communication system carry out following procedure: the laser
The light that device projects is divided into signal carrier and local oscillator light through the beam splitter, and the local oscillator light that the beam splitter separates is through the frequency shifter
After shift frequency, by the first polarization beam apparatus PBS1 beam splitting；The signal carrier that the beam splitter separates is through the first annular device
1 port of C1 inputs, and 2 port of the port output through the first annular device C1 transmits arriving signal transmitting terminal through transmission link
Polarization Controller PC, through the Polarization Controller PC enter the second circulator C2, by 2 ends of the second circulator C2
Mouth input, 3 ports are exported to third polarization beam apparatus PBS3, inclined for X polarised light and Y by the third polarization beam apparatus PBS3 points
Shake light, and the X polarised light of third polarization beam apparatus PBS3 output is after the first I/Q modulator IQM1 modulation, by the first Faraday rotation
Mirror FRM1 reflection, into polarization beam combiner PBC, the Y polarised light of third polarization beam apparatus PBS3 output is through the second I/Q modulator
It after IQM2 modulation, is reflected by the second faraday rotation mirror FRM2, into polarization beam combiner PBC, after polarization beam combiner PBC closes beam
1 port that the second circulator C2 is returned by polarization maintaining optical fibre, the 2 ports output through the second circulator C2, is controlled through the polarization
Device PC processed, transmission link are transferred to 2 ports of the first annular device C1, the 3 ports output through first annular device C1, through second
Polarization beam apparatus PBS2 beam splitting, the X polarised light point after the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2 beam splitting
First photoelectric detector PD 1 is not injected and carries out photoelectric conversion, obtains output light electric current IXAnd it is single to be input to the first KK conversion
First KK1 is exported through the first KK converting unit KK1 to the carrier auxiliary and data decision unit, first polarization point
Y polarised light after beam device PBS1, the second polarization beam apparatus PBS2 beam splitting injects second photoelectric detector PD 2 respectively and carries out light
Electricity conversion, obtains output light electric current IY, and it is input to the 2nd KK converting unit KK2, it is exported through the 2nd KK converting unit KK2
To the carrier auxiliary and data decision unit, the carrier auxiliary and data decision unit carry out data after carrier auxiliary and sentence
Certainly.
As a further improvement of the present invention, the light splitting ratio of the beam splitter is adjustable, and splitting ratio guarantees the local oscillator light
Intensity is 7-9dB bigger than reflected signal light intensity, and the Polarization Controller PC is used to control the power phase of two polarization state lights
Deng.
As a further improvement of the present invention, the local oscillator light of the beam splitter separation is after the frequency shifter shift frequency Δ f, Δ
Baud rate/2 f=are loaded into respectively in X, Y polarization signal, are detected through the first photoelectric detector PD 1, the second photoelectric detector PD 2
After obtain photoelectric current IXWith photoelectric current IY, the amplitude and phase information of X polarization signal is obtained by the first KK converting unit KK1, by
Two KK converting unit KK2 obtain the amplitude and phase information of Y polarization signal.
As a further improvement of the present invention, the first KK converting unit KK1 and the 2nd KK converting unit KK2 is executed
Kramers-Kronig algorithm is as follows:
Wherein, φX(t)、φY(t) phase of gained X, Y polarized light field after local oscillator light Wei not be loaded, p.v. is Cauchy's principal value
Integral, Δ f are the shift frequency amount of intrinsic light, ELO-X、ELO-YThe amplitude of respectively local oscillator light X, Y polarization is fixed constant.
The beneficial effects of the present invention are: on the one hand, in a manner of directly detecting, realizing the transmission of dual-polarization QAM signal, phase
To traditional amplitude modulation-direct detection scheme, spectrum efficiency is greatly improved；On the other hand, pass through reasonable optical fiber chain
Road design can remove DSP module complicated in partially coherent reception, including dispersion compensation and polarization Aliasing compensation, greatly
Ground reduces power consumption, so that should be suitable for short haul connection.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram that communication system is directly detected based on the received dual-polarization QAM modulation of K-K of the present invention.
Specific embodiment
The invention will be further described for explanation and specific embodiment with reference to the accompanying drawing.
Solid arrow in Fig. 1 is normal connection, and dotted arrow is polarization-maintaining connection.
As shown in Figure 1, a kind of directly detect communication system based on the received dual-polarization QAM modulation of K-K, including signal receives
End 10 and signal transmitting terminal 20, the signal receiving end 10 is connect with the signal transmitting terminal 20 by transmission link 30, described
Signal receiving end 10 includes laser 11, beam splitter 12, frequency shifter 13, the first polarization beam apparatus PBS1, the second polarization beam apparatus
PBS2, the first photoelectric detector PD 1, the second photoelectric detector PD 2, the first KK converting unit KK1, the 2nd KK converting unit KK2,
Carrier auxiliary and data decision unit 14 and first annular device C1, the output end of the laser 11 are defeated with the beam splitter 12
Enter end connection, the local oscillator light output end of the beam splitter 12 is connect with the input terminal of the frequency shifter 13, the frequency shifter 13
Output end is connect with the input terminal of the first polarization beam apparatus PBS1, and the X polarised light of the first polarization beam apparatus PBS1 is defeated
Outlet is connect with the input terminal of first photoelectric detector PD 1, and the Y of the first polarization beam apparatus PBS1 polarizes light output end
It is connect with the input terminal of second photoelectric detector PD 2, the signal transmitting terminal 20 includes Polarization Controller PC, the second annular
Device C2, third polarization beam apparatus PBS3, the first I/Q modulator IQM1, the first faraday rotation mirror FRM1, the second I/Q modulator
IQM2, the second faraday rotation mirror FRM2 and polarization beam combiner PBC, the signal carrier output end of the beam splitter and described first
1 port of circulator C1 connects, and 2 ports of the first annular device C1 pass through the transmission link 30 and the Polarization Controller
PC connection, the Polarization Controller PC are connect with 2 ports of the second circulator C2,3 ports of the second circulator C2
Connect with the input terminal of the third polarization beam apparatus PBS3, the X of third polarization beam apparatus PBS3 polarization light output end with
The input terminal of the first I/Q modulator IQM1 connects, the output end of the first I/Q modulator IQM1 and first faraday
The input terminal of revolving mirror FRM1 connects, and the output end of the first faraday rotation mirror FRM1 is with the polarization beam combiner PBC's
Input terminal connection, the input of Y the polarization light output end and the second I/Q modulator IQM2 of the third polarization beam apparatus PBS3
End connection, the output end of the second I/Q modulator IQM2 are connect with the input terminal of the second faraday rotation mirror FRM2, institute
The output end for stating the second faraday rotation mirror FRM2 is connect with the input terminal of the polarization beam combiner PBC, the polarization beam combiner
The output end of PBC is connect with 1 port of the second circulator C2, and 3 ports of the first annular device C1 are inclined with described second
The input terminal connection of vibration beam splitter PBS2, the X polarization light output end of the second polarization beam apparatus PBS2 and first photoelectricity
The input terminal of detector PD1 connects, the Y polarization light output end of the second polarization beam apparatus PBS2 and second photodetection
The input terminal of device PD2 connects, the input of the output end of first photoelectric detector PD 1 and the first KK converting unit KK1
End connection, the output end of second photoelectric detector PD 2 is connect with the input terminal of the 2nd KK converting unit KK2, described
First KK converting unit KK1, the 2nd KK converting unit KK2 output end respectively with the carrier auxiliary and data decision unit 14
Input terminal connection.
As shown in Figure 1, the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and data decision unit
14 are all made of digital signal processor (DSP) Lai Shixian of low-power consumption, low complex degree.
As shown in Figure 1, the transmission link 20 is preferably single mode optical fiber.
As shown in Figure 1, the signal transmitting terminal further includes third circulator C3 and fourth annular device C4, the third annular
1 port of device C3 is connect with the output end of the second I/Q modulator IQM2,2 ports of the third circulator C3 and described the
Two faraday rotation mirror FRM2 connections, 3 ports of the third circulator C3 and the input terminal of the polarization beam combiner PBC connect
It connects；1 port of the fourth annular device C4 is connect with the output end of the first I/Q modulator IQM1, the fourth annular device C4
2 ports connect with the first faraday rotation mirror FRM2,3 ports of the fourth annular device C4 and the polarization beam combiner
The input terminal of PBC connects.
As shown in Figure 1, being connected between the third polarization beam apparatus PBS3, the first I/Q modulator IQM1 by polarization maintaining optical fibre
Connect, the first I/Q modulator IQM1, fourth annular device C4 1 port 1 between pass through polarization maintaining optical fibre connect, the fourth annular
It is connected between 2 ports of device C4, the first faraday rotation mirror FRM2 by polarization maintaining optical fibre, 3 ports of the fourth annular device C4,
It is connected between polarization beam combiner PBC by polarization maintaining optical fibre, between the third polarization beam apparatus PBS3, the second I/Q modulator IQM2
Connected by polarization maintaining optical fibre, the second I/Q modulator IQM2, third circulator C3 1 port 1 between pass through polarization maintaining optical fibre connect
It connects, passes through polarization maintaining optical fibre between 2 ports of the third circulator C3, the second faraday rotation mirror FRM2 and connect, the third
Pass through polarization maintaining optical fibre between 3 ports of circulator C3, polarization beam combiner PBC to connect.
As shown in Figure 1, being connected between the beam splitter 12, frequency shifter 13 by polarization maintaining optical fibre, the first annular device C1
3 ports, pass through polarization maintaining optical fibre between the second polarization beam apparatus PBS2 and connect.
As shown in Figure 1, in order to reduce the influence of effect of dispersion, it is described directly to be examined based on the received dual-polarization QAM modulation of K-K
It surveys communication system and works in O wave band, wavelength 1260-1360nm.The wave band is near SMF zero-dispersion wavelength.Therefore, optical fiber
Effect of dispersion can be ignored substantially, without carrying out the dispersion compensation of numeric field.In fact, the commercial data center's communication of number at present
It is also O wave band, under this condition, signal with the standard operation window that 100GBASE-LR4 makees the system of transmitting module in link
The dispersion that transmission 10km is introduced can be ignored.
As shown in Figure 1, a kind of directly detect communication means based on the received dual-polarization QAM modulation of K-K, based on appointing among the above
Communication system is directly detected based on the received dual-polarization QAM modulation of K-K described in one and carries out following procedure: the laser 11
The light of injection divides through the beam splitter 12 for signal carrier and local oscillator light, and the local oscillator light that the beam splitter 12 separates is through the shift frequency
After 13 shift frequency of device, by the first polarization beam apparatus PBS1 beam splitting；The signal carrier that the beam splitter 12 separates is through described first
1 port of circulator C1 inputs, and 2 port of the port output through the first annular device C1 is transmitted through transmission link 30 and reaches letter
The Polarization Controller PC of number transmitting terminal 20 enters the second circulator C2 through the Polarization Controller PC, by second ring
2 ports of shape device C2 input, and 3 ports are exported to third polarization beam apparatus PBS3, are X by the third polarization beam apparatus PBS3 points
Polarised light and Y polarised light, the X polarised light of third polarization beam apparatus PBS3 output is after the first I/Q modulator IQM1 modulation, by the
One faraday rotation mirror FRM1 reflection, into polarization beam combiner PBC, the Y polarised light of third polarization beam apparatus PBS3 output is through the
After two I/Q modulator IQM2 modulation, reflected by the second faraday rotation mirror FRM2, into polarization beam combiner PBC, in polarization coupling
1 port for returning to the second circulator C2 after device PBC conjunction beam by polarization maintaining optical fibre, the 2 ports output through the second circulator C2, warp
The Polarization Controller PC, transmission link 30 are transferred to 2 ports of the first annular device C1,3 ends through first annular device C1
Mouth output, through the second polarization beam apparatus PBS2 beam splitting, the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2 beam splitting
X polarised light afterwards injects first photoelectric detector PD 1 respectively and carries out photoelectric conversion, obtains output light electric current IXAnd it is input to
First KK converting unit KK1 is exported through the first KK converting unit KK1 to the carrier auxiliary and data decision unit, institute
Y polarised light after stating the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2 beam splitting is injected second photoelectricity respectively and is visited
It surveys device PD2 and carries out photoelectric conversion, obtain output light electric current IY, and it is input to the 2nd KK converting unit KK2, turn through the 2nd KK
It changes unit KK2 to export to the carrier auxiliary and data decision unit 14, the carrier auxiliary and data decision unit 14 are carrying
Wave carries out data decision after restoring.
This programme uses dual-polarization modulation format, in transmission process, due to random birefringence effect, inevitably
Polarization aliasing is introduced, the present invention proposes that link scheme as shown in Figure 1 realizes the self compensation of polarization aliasing.As shown in Figure 1, laser
Device is located at receiving end, the signal carrier of transmitting after transmission link to transmitting terminal, by farad after the modulation of dual-polarization I/Q modulator
Revolving mirror reflection returns to former transmission link through polarization maintaining optical fibre.In stable optical fiber link, introduced due to random birefringence
The polarization state speed of rotation is generally in 10krad/s-200krad/s, and in data center's internal communication link (500m-10km),
Time needed for round-trip light passes through optical fiber same point is up toIn the so short time
It is interior, it is believed that the Jones matrix of optical fiber link does not change, under this condition, document Yamashita S, Hotate
K,Ito M.Polarization properties of a reflective fiber amplifier employing a
circulator and a Faraday rotator mirror[J].Lightwave Technology Journal of,
1996,14 (3): 385-390 is it has been proved that the polarization state by the light of some transmitting and the light after faraday rotation mirror return is changed the time
Polarization state it is vertical.Therefore, the design of the link realizes the self-complementary of polarization aliasing to lose the small part power of signal carrier
It repays.In addition, nonlinear effect and polarization mode dispersion can be ignored in short haul connection.
As shown in Figure 1, the light splitting ratio of the beam splitter 12 is adjustable, splitting ratio guarantees that the local oscillator light strength ratio is reflected back
The big 7-9dB of signal light intensity come, the power that the Polarization Controller PC is used to control two polarization state lights are equal.
As shown in Figure 1, the isolated local oscillator light of the beam splitter 12 is after the 13 shift frequency Δ f of frequency shifter, Δ f=baud
Rate/2 are loaded into respectively in X, Y polarization signal, are obtained after the first photoelectric detector PD 1, the detection of the second photoelectric detector PD 2
Photoelectric current IXWith photoelectric current IY, the amplitude and phase information of X polarization signal is obtained by the first KK converting unit KK1, is turned by the 2nd KK
It changes unit KK2 and obtains the amplitude and phase information of Y polarization signal.
As shown in Figure 1, the Kramers- that the first KK converting unit KK1 and the 2nd KK converting unit KK2 is executed
Kronig algorithm is as follows:
Wherein, φX(t)、φY(t) phase of gained X, Y polarized light field after local oscillator light Wei not be loaded, p.v. is Cauchy's principal value
Integral, Δ f are the shift frequency amount of intrinsic light, ELO-X、ELO-YThe amplitude of respectively local oscillator light X, Y polarization is fixed constant.
A kind of received dual-polarization QAM modulation of K-K that is based on provided by the invention directly detects communication system and method, is one
Kind apply the direct detection communication party of low-power consumption in data center's internal communication, the dual-polarization QAM modulation of low DSP complexity
Case goes to replace complicated DSP module by using the design of reasonable structure and optical component, to reduce power consumption.In conjunction with
Kramers-Kronig algorithm realizes that QAM signal transmits in a manner of directly detecting.
A kind of received dual-polarization QAM modulation of K-K that is based on provided by the invention directly detects communication system and method, a side
Face realizes dual-polarization QAM signal and transmits in a manner of directly detecting, relatively traditional amplitude modulation-direct detection scheme,
Greatly improve spectrum efficiency.On the other hand, it is designed, can be removed multiple in partially coherent reception by reasonable optical fiber link
Miscellaneous DSP module, including dispersion compensation and polarization Aliasing compensation, significantly reduce power consumption, so that should be suitable for short distance
Communication.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. one kind directly detects communication system based on the received dual-polarization QAM modulation of K-K, it is characterised in that: received including signal
End and signal transmitting terminal, the signal receiving end are connect with the signal transmitting terminal by transmission link, the signal receiving end
Including laser, beam splitter, frequency shifter, the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2, the first photodetector
PD1, the second photoelectric detector PD 2, the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and data decision
Unit and first annular device C1, the output end of the laser are connect with the input terminal of the beam splitter, the sheet of the beam splitter
Vibration light output end is connect with the input terminal of the frequency shifter, the output end of the frequency shifter and the first polarization beam apparatus PBS1
Input terminal connection, X polarization light output end and first photoelectric detector PD 1 of the first polarization beam apparatus PBS1 it is defeated
Enter end connection, the input terminal of Y the polarization light output end and second photoelectric detector PD 2 of the first polarization beam apparatus PBS1
Connection, the signal transmitting terminal includes Polarization Controller PC, the second circulator C2, third polarization beam apparatus PBS3, the first IQ tune
Device IQM1, the first faraday rotation mirror FRM1, the second I/Q modulator IQM2, the second faraday rotation mirror FRM2 and polarization coupling processed
Device PBC, the signal carrier output end of the beam splitter are connect with 1 port of the first annular device C1, the first annular device
2 ports of C1 are connect by the transmission link with the Polarization Controller PC, the Polarization Controller PC and second ring
2 ports of shape device C2 connect, and the input terminal of 3 ports of the second circulator C2 and the third polarization beam apparatus PBS3 connect
It connects, the X polarization light output end of the third polarization beam apparatus PBS3 is connect with the input terminal of the first I/Q modulator IQM1, institute
The output end for stating the first I/Q modulator IQM1 is connect with the input terminal of the first faraday rotation mirror FRM1, and described first farad
The output end of revolving mirror FRM1 is connect with the input terminal of the polarization beam combiner PBC, the Y of the third polarization beam apparatus PBS3
Polarization light output end connect with the input terminal of the second I/Q modulator IQM2, the output end of the second I/Q modulator IQM2 and
The input terminal of the second faraday rotation mirror FRM2 connects, the output end of the second faraday rotation mirror FRM2 and it is described partially
1 port of the input terminal connection of vibration bundling device PBC, the output end of the polarization beam combiner PBC and the second circulator C2 connect
It connects, 3 ports of the first annular device C1 are connect with the input terminal of the second polarization beam apparatus PBS2, second polarization point
The X polarization light output end of beam device PBS2 is connect with the input terminal of first photoelectric detector PD 1, second polarization beam apparatus
The Y polarization light output end of PBS2 is connect with the input terminal of second photoelectric detector PD 2, first photoelectric detector PD 1
Output end connect with the input terminal of the first KK converting unit KK1, the output end of second photoelectric detector PD 2 and institute
State the input terminal connection of the 2nd KK converting unit KK2, the output of the first KK the converting unit KK1, the 2nd KK converting unit KK2
End is connect with the input terminal of the carrier auxiliary and data decision unit respectively.
2. according to claim 1 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: the transmission link is single mode optical fiber.
3. according to claim 1 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: the signal transmitting terminal further include third circulator C3 and fourth annular device C4,1 port of the third circulator C3 and institute
State the output end connection of the second I/Q modulator IQM2,2 ports of the third circulator C3 and second faraday rotation mirror
3 ports of FRM2 connection, the third circulator C3 are connect with the input terminal of the polarization beam combiner PBC；The fourth annular
1 port of device C4 is connect with the output end of the first I/Q modulator IQM1,2 ports of the fourth annular device C4 and described the
One faraday rotation mirror FRM2 connection, 3 ports of the fourth annular device C4 and the input terminal of the polarization beam combiner PBC connect
It connects.
4. according to claim 3 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: it is connected between the third polarization beam apparatus PBS3, the first I/Q modulator IQM1 by polarization maintaining optical fibre, the first IQ modulation
Device IQM1, fourth annular device C4 1 port 1 between pass through polarization maintaining optical fibre connect, 2 ports of the fourth annular device C4, first
Connected between faraday rotation mirror FRM2 by polarization maintaining optical fibre, 3 ports of the fourth annular device C4, polarization beam combiner PBC it
Between by polarization maintaining optical fibre connect, between the third polarization beam apparatus PBS3, the second I/Q modulator IQM2 by polarization maintaining optical fibre company
Connect, the second I/Q modulator I QM2, third circulator C3 1 port 1 between pass through polarization maintaining optical fibre connect, the third ring
It is connected between 2 ports of shape device C3, the second faraday rotation mirror FRM2 by polarization maintaining optical fibre, 3 ends of the third circulator C3
Pass through polarization maintaining optical fibre between mouth, polarization beam combiner PBC to connect.
5. according to claim 1 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: it is connected between the beam splitter, frequency shifter by polarization maintaining optical fibre, 3 ports of the first annular device C1, the second polarization beam splitting
It is connected between device PBS2 by polarization maintaining optical fibre.
6. according to claim 1 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: it is described directly to detect communication system based on the received dual-polarization QAM modulation of K-K and work in O wave band, wavelength 1260-
1360nm。
7. one kind directly detects communication means based on the received dual-polarization QAM modulation of K-K, it is characterised in that: be based on claim 1
Following procedure is carried out to communication system is directly detected based on the received dual-polarization QAM modulation of K-K described in any one of 6: described
The light that laser projects is divided into signal carrier and local oscillator light through the beam splitter, and the local oscillator light that the beam splitter separates is through the shifting
After frequency device shift frequency, by the first polarization beam apparatus PBS1 beam splitting；The signal carrier that the beam splitter separates is through first ring
1 port of shape device C1 inputs, 2 port of the port output through the first annular device C1, through transmission link transmission arriving signal hair
The Polarization Controller PC for penetrating end enters the second circulator C2 through the Polarization Controller PC, by the second circulator C2
The input of 2 ports, 3 ports export to third polarization beam apparatus PBS3, are X polarised light by the third polarization beam apparatus PBS3 points
With Y polarised light, the X polarised light of third polarization beam apparatus PBS3 output is after the first I/Q modulator IQM1 modulation, by first farad
Revolving mirror FRM1 reflection, into polarization beam combiner PBC, the Y polarised light of third polarization beam apparatus PBS3 output is through the 2nd IQ tune
It after device IQM2 modulation processed, is reflected by the second faraday rotation mirror FRM2, into polarization beam combiner PBC, is closed in polarization beam combiner PBC
1 port for returning to the second circulator C2 after beam by polarization maintaining optical fibre, the 2 ports output through the second circulator C2, through described inclined
Vibration controller PC, transmission link are transferred to 2 ports of the first annular device C1, the 3 ports output through first annular device C1, warp
Second polarization beam apparatus PBS2 beam splitting, the X polarization after the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2 beam splitting
Light injects first photoelectric detector PD 1 respectively and carries out photoelectric conversion, obtains output light electric current IXAnd it is input to the first KK and turns
Unit KK1 is changed, is exported through the first KK converting unit KK1 to the carrier auxiliary and data decision unit, described first partially
Vibration beam splitter PBS1, the Y polarised light after the second polarization beam apparatus PBS2 beam splitting inject respectively second photoelectric detector PD 2 into
Row photoelectric conversion obtains output light electric current IY, and it is input to the 2nd KK converting unit KK2, through the 2nd KK converting unit KK2
Output is to the carrier auxiliary and data decision unit, and the carrier auxiliary and data decision unit are in the laggard line number of carrier auxiliary
According to judgement.
8. according to claim 7 directly detect communication means based on the received dual-polarization QAM modulation of K-K, feature exists
In: the light splitting ratio of the beam splitter is adjustable, and splitting ratio guarantees that the reflected signal light intensity of local oscillator light strength ratio is big
The power that 7-9dB, the Polarization Controller PC are used to control two polarization state lights is equal.
9. according to claim 7 directly detect communication means based on the received dual-polarization QAM modulation of K-K, feature exists
In: for the local oscillator light of the beam splitter separation after the frequency shifter shift frequency Δ f, it is inclined to be loaded into X, Y respectively for baud rate/2 Δ f=
It shakes in signal, obtains photoelectric current I after the first photoelectric detector PD 1, the detection of the second photoelectric detector PD 2XWith photoelectric current IY, by
First KK converting unit KK1 obtains the amplitude and phase information of X polarization signal, obtains Y polarization letter by the 2nd KK converting unit KK2
Number amplitude and phase information.
10. according to claim 9 directly detect communication means based on the received dual-polarization QAM modulation of K-K, feature exists
In: the Kramers-Kronig algorithm that the first KK converting unit KK1 and the 2nd KK converting unit KK2 is executed is as follows:
Wherein, φX(t)、φY(t) phase of gained X, Y polarized light field after local oscillator light Wei not be loaded, p.v. is that Cauchy's principal value is accumulated
Point, Δ f is the shift frequency amount of intrinsic light, ELO-X、ELO-YThe amplitude of respectively local oscillator light X, Y polarization is fixed constant.
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|---|---|---|---|---|
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040125374A1 (en) * | 2002-08-07 | 2004-07-01 | Berger Jill D. | Tunable optical filter, optical apparatus for use therewith and method utilizing same |
| US20080138070A1 (en) * | 2006-12-06 | 2008-06-12 | General Photonics Corporation | Optical Polarization Division Multiplexing In Optical Communication |
| CN102629887A (en) * | 2012-05-09 | 2012-08-08 | 电子科技大学 | Full-duplex radio-over-fiber (RoF) access device |
| WO2013023425A1 (en) * | 2011-08-18 | 2013-02-21 | 天津大学 | Polarization sensitive distributed optical frequency domain reflection turbulence sensing device and demodulation method |
| CN103441808A (en) * | 2013-08-26 | 2013-12-11 | 哈尔滨工业大学深圳研究生院 | High-speed pseudorandom binary sequence generating device based on photovoltaic conversion |
| CN106357312A (en) * | 2016-09-12 | 2017-01-25 | 南京信息工程大学 | Lattice reduction assisted breadth-first tree searching MIMO detecting method |
| WO2017212492A1 (en) * | 2016-06-08 | 2017-12-14 | Ramot At Tel-Aviv University Ltd. | Kramers-kronig receiver |
| CN108736978A (en) * | 2018-08-07 | 2018-11-02 | 电子科技大学 | A kind of reflective coherent optical communication system transmitting terminal |
| CN109186644A (en) * | 2018-08-29 | 2019-01-11 | 北京航天控制仪器研究所 | Spectrum splices probe beam deflation type distributed fiberoptic sensor and signal demodulating method |
| CN109257109A (en) * | 2018-12-07 | 2019-01-22 | 中国人民解放军国防科技大学 | Quantum secret communication light path |
| CN209250650U (en) * | 2019-01-24 | 2019-08-13 | 哈尔滨工业大学（深圳） | Communication system is directly detected based on the received dual-polarization QAM modulation of K-K |
-
2019
- 2019-01-24 CN CN201910067785.7A patent/CN109560877B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040125374A1 (en) * | 2002-08-07 | 2004-07-01 | Berger Jill D. | Tunable optical filter, optical apparatus for use therewith and method utilizing same |
| US20080138070A1 (en) * | 2006-12-06 | 2008-06-12 | General Photonics Corporation | Optical Polarization Division Multiplexing In Optical Communication |
| WO2013023425A1 (en) * | 2011-08-18 | 2013-02-21 | 天津大学 | Polarization sensitive distributed optical frequency domain reflection turbulence sensing device and demodulation method |
| CN102629887A (en) * | 2012-05-09 | 2012-08-08 | 电子科技大学 | Full-duplex radio-over-fiber (RoF) access device |
| CN103441808A (en) * | 2013-08-26 | 2013-12-11 | 哈尔滨工业大学深圳研究生院 | High-speed pseudorandom binary sequence generating device based on photovoltaic conversion |
| WO2017212492A1 (en) * | 2016-06-08 | 2017-12-14 | Ramot At Tel-Aviv University Ltd. | Kramers-kronig receiver |
| CN106357312A (en) * | 2016-09-12 | 2017-01-25 | 南京信息工程大学 | Lattice reduction assisted breadth-first tree searching MIMO detecting method |
| CN108736978A (en) * | 2018-08-07 | 2018-11-02 | 电子科技大学 | A kind of reflective coherent optical communication system transmitting terminal |
| CN109186644A (en) * | 2018-08-29 | 2019-01-11 | 北京航天控制仪器研究所 | Spectrum splices probe beam deflation type distributed fiberoptic sensor and signal demodulating method |
| CN109257109A (en) * | 2018-12-07 | 2019-01-22 | 中国人民解放军国防科技大学 | Quantum secret communication light path |
| CN209250650U (en) * | 2019-01-24 | 2019-08-13 | 哈尔滨工业大学（深圳） | Communication system is directly detected based on the received dual-polarization QAM modulation of K-K |
Non-Patent Citations (2)
| Title |
|---|
| I. B. BREZEANU: "《Applications of Kramers-Kronig Relations 》", 《2017 IEEE 23RD INTERNATIONAL SYMPOSIUM FOR DESIGN AND TECHNOLOGY IN ELECTRONIC PACKAGING (SIITME)》 * |
| 宋秋衡;贾波;周鹏威;陈永超;艾鑫;肖倩;: "一种基于保偏光纤干涉结构的稳定光谱测量方法", 复旦学报(自然科学版), no. 06 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855365A (en) * | 2019-09-25 | 2020-02-28 | 国家电网公司西北分部 | Relay-less optical fiber transmission system and relay-less optical fiber transmission method |
| CN110855365B (en) * | 2019-09-25 | 2024-03-29 | 国家电网公司西北分部 | Relay-free optical fiber transmission system and relay-free optical fiber transmission method |
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