CN209250650U - Communication system is directly detected based on the received dual-polarization QAM modulation of K-K - Google Patents
Communication system is directly detected based on the received dual-polarization QAM modulation of K-K Download PDFInfo
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- CN209250650U CN209250650U CN201920121603.5U CN201920121603U CN209250650U CN 209250650 U CN209250650 U CN 209250650U CN 201920121603 U CN201920121603 U CN 201920121603U CN 209250650 U CN209250650 U CN 209250650U
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Abstract
The utility model provides one kind and directly detects 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 beneficial effects of the utility model 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 utility model relates to short distance optical communication fields, more particularly to one kind to be based on the received dual-polarization QAM modulation of K-K
Directly detect communication system.
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 2020 DC are up to 15 Zbit, 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
Component is learned 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, by combine Stokes receive and Kramers-Kronig(K-K) receive, 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(photodetectors), 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, the utility model provides a kind of based on the received dual-polarization QAM tune of K-K
System directly detects communication system.
The utility model provides one kind and directly detects communication system, including letter based on the received dual-polarization QAM modulation of K-K
Number receiving end and signal transmitting terminal, the signal receiving end are connect with the signal transmitting terminal by transmission link, the signal
Receiving end includes laser, beam splitter, frequency shifter, the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2, the first photoelectricity
Detector PD1, the second photoelectric detector PD 2, the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and number
According to decision unit and first annular device C1, the output end of the laser is connect with the input terminal of the beam splitter, the beam splitting
The local oscillator light output end of device is connect with the input terminal of the frequency shifter, the output end of the frequency shifter and first polarization beam splitting
The input terminal of device PBS1 connects, the X polarization light output end of the first polarization beam apparatus PBS1 and first photodetector
The input terminal of PD1 connects, the Y polarization light output end of the first polarization beam apparatus PBS1 and second photoelectric detector PD 2
Input terminal 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 beam combiner PBC, the signal carrier output end of the beam splitter are connect with 1 port of the first annular device C1, and described
2 ports of one circulator C1 are connect by the transmission link with the Polarization Controller PC, the Polarization Controller PC and institute
The 2 ports connection of the second circulator C2 is stated, 3 ports of the second circulator C2 are defeated with the third polarization beam apparatus PBS3's
Enter end connection, the input terminal of X the polarization light output end and the first I/Q modulator IQM1 of the third polarization beam apparatus PBS3
Connection, the output end of the first I/Q modulator IQM1 is connect with the input terminal of the first faraday rotation mirror FRM1, described
The output end of first faraday rotation mirror FRM1 is connect with the input terminal of the polarization beam combiner PBC, the third polarization beam splitting
The Y polarization light output end of device PBS3 is connect with the input terminal of the second I/Q modulator IQM2, the second I/Q modulator IQM2
Output end connect with the input terminal of the second faraday rotation mirror FRM2, the output of the second faraday rotation mirror FRM2
End is connect with the input terminal of the polarization beam combiner PBC, the output end of the polarization beam combiner PBC and the second circulator C2
1 port connection, 3 ports of the first annular device C1 are connect with the input terminal of the second polarization beam apparatus PBS2, described
The X polarization light output end of second polarization beam apparatus PBS2 is connect with the input terminal of first photoelectric detector PD 1, and described second
The Y polarization light output end of polarization beam apparatus PBS2 is connect with the input terminal of second photoelectric detector PD 2, first photoelectricity
The output end of detector PD1 is connect with the input terminal of the first KK converting unit KK1, second photoelectric detector PD 2
Output end is connect with the input terminal of the 2nd KK converting unit KK2, and the first KK converting unit KK1, the 2nd KK conversion are single
The output end of first KK2 is connect with the input terminal of the carrier auxiliary and data decision unit respectively.
The transmission link is single mode optical fiber as a further improvement of the utility model,.
The signal transmitting terminal further includes third circulator C3 and fourth annular as a further improvement of the utility model,
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
2 ports of C3 are connect with the second faraday rotation mirror FRM2,3 ports of the third circulator C3 and the polarization coupling
The input terminal of device PBC connects；1 port of the fourth annular device C4 is connect with the output end of the first I/Q modulator IQM1,
2 ports of the fourth annular device C4 are connect with the first faraday rotation mirror FRM2,3 ports of the fourth annular device C4
It is connect with the input terminal of the polarization beam combiner PBC.
As a further improvement of the utility model, the third polarization beam apparatus PBS3, the first I/Q modulator IQM1 it
Between 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
Connection, by polarization maintaining optical fibre connection between 2 ports of the fourth annular device C4, the first faraday rotation mirror FRM2, described the
It is connected between 3 ports of four circulator C4, polarization beam combiner PBC by polarization maintaining optical fibre, the third polarization beam apparatus PBS3, the
It is connected between two I/Q modulator IQM2 by polarization maintaining optical fibre, 1 port 1 of the second I/Q modulator IQM2, third circulator C3
Between connected by polarization maintaining optical fibre, pass through polarization-maintaining between 2 ports of the third circulator C3, the second faraday rotation mirror FRM2
Optical fiber connection passes through polarization maintaining optical fibre connection between 3 ports of the third circulator C3, polarization beam combiner PBC.
It is connected between the beam splitter, frequency shifter by polarization maintaining optical fibre as a further improvement of the utility model, it is described
It is connected between 3 ports of first annular device C1, the second polarization beam apparatus PBS2 by polarization maintaining optical fibre.
It is described as a further improvement of the utility model, that communication is directly detected based on the received dual-polarization QAM modulation of K-K
System works in O wave band, wavelength 1260-1360nm.
The first KK converting unit KK1, the 2nd KK converting unit KK2, load as a further improvement of the utility model,
Wave restores and data decision unit is digital signal processor.
The beneficial effects of the utility model are: on the one hand, in a manner of directly detecting, realizing dual-polarization QAM signal biography
Defeated, relatively traditional amplitude modulation-direct detection scheme, greatly improves spectrum efficiency；On the other hand, pass through reasonable light
Fine link design can remove DSP module complicated in partially coherent reception, including dispersion compensation and polarization Aliasing compensation,
Power consumption is significantly reduced, so that short haul connection should be suitable for.
Detailed description of the invention
Fig. 1 is a kind of signal that communication system is directly detected based on the received dual-polarization QAM modulation of K-K of the utility model
Figure.
Specific embodiment
The utility model is described in further detail 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 be all made of digital signal processor (DSP) Lai Shixian of low-power consumption, low complex degree, can pass through low-power consumption, low complex degree
Digital signal processor (DSP) realizes the Kramers- of the first KK converting unit KK1, the 2nd KK converting unit KK2 respectively
Kronig is received, and can realize carrier auxiliary and data decision by the digital signal processor (DSP) of low-power consumption, low complex degree
The carrier auxiliary and data decision of unit 14.
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 system, working principle based on the received dual-polarization QAM modulation of K-K
Are as follows: light that the laser 11 projects divides through the beam splitter 12 to be separated for signal carrier and local oscillator light, the beam splitter 12
Local oscillator light is after 13 shift frequency of frequency shifter, by the first polarization beam apparatus PBS1 beam splitting；The letter that the beam splitter 12 separates
Number carrier wave is inputted through 1 port of the first annular device C1,2 port of the port output through the first annular device C1, through transmitting
Link 30 transmits the Polarization Controller PC of arriving signal transmitting terminal 20, enters second circulator through the Polarization Controller PC
C2 is inputted by 2 ports of the second circulator C2, and 3 ports export to third polarization beam apparatus PBS3, polarized by the third
Beam splitter PBS3 points are X polarised light and Y polarised light, and the X polarised light of third polarization beam apparatus PBS3 output is through the first I/Q modulator
After IQM1 modulation, reflected by the first faraday rotation mirror FRM1, into polarization beam combiner PBC, third polarization beam apparatus PBS3 is defeated
Y polarised light out is reflected, into polarization beam combiner after the second I/Q modulator IQM2 modulation by the second faraday rotation mirror FRM2
PBC is returned to 1 port of the second circulator C2, through the second circulator C2 after polarization beam combiner PBC closes beam by polarization maintaining optical fibre
2 ports output, 2 ports of the first annular device C1 are transferred to through the Polarization Controller PC, transmission link 30, through first
3 ports of circulator C1 export, through the second polarization beam apparatus PBS2 beam splitting, the first polarization beam apparatus PBS1, the second polarization
X polarised light after beam splitter PBS2 beam splitting 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 converting unit KK1, it exports through the first KK converting unit KK1 to the carrier auxiliary and number
According to decision unit, the Y polarised light after the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2 beam splitting injects institute respectively
It states the second photoelectric detector PD 2 and carries out photoelectric conversion, obtain output light electric current IY, and it is input to the 2nd KK converting unit KK2, it passes through
The 2nd KK converting unit KK2 is exported to the carrier auxiliary and data decision unit 14, and the carrier auxiliary and data are sentenced
Certainly unit 14 carries out data decision after carrier auxiliary.
This programme uses dual-polarization modulation format, in transmission process, due to random birefringence effect, inevitably
Polarization aliasing is introduced, the utility model proposes the self compensations that link scheme as shown in Figure 1 realizes polarization aliasing.As shown in Figure 1,
Laser is located at receiving end, the signal carrier of transmitting after transmission link to transmitting terminal, after the modulation of dual-polarization I/Q modulator by
Faraday rotation mirror reflection returns to former transmission link through polarization maintaining optical fibre.In stable optical fiber link, since random birefringence is drawn
The polarization state speed of rotation entered is generally in 10krad/s-200krad/s, and (the 500m- in data center's internal communication link
10km), the time needed for round-trip light passes through optical fiber same point is up to, so short
In time, 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 by the polarization state of the light of some transmitting and through Faraday rotation
The polarization state of light is vertical after mirror return is changed the time.Therefore, the design of the link is realized with losing the small part power of signal carrier
Polarize the self compensation of aliasing.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 through 13 shift frequency of frequency shifterAfterwards,=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.
A kind of received dual-polarization QAM modulation of K-K that is based on provided by the utility model directly detects communication system, is a kind of
The direct detection communication plan of low-power consumption in data center's internal communication, the dual-polarization QAM modulation of low DSP complexity is applied,
It 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 is received, and 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 utility model directly detects communication system, 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.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (7)
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 IQM2, third circulator C3 1 port 1 between pass through polarization maintaining optical fibre and connect, third annular
It is connected between 2 ports of device C3, the second faraday rotation mirror FRM2 by polarization maintaining optical fibre, 3 ports of the third circulator C3,
It is connected between polarization beam combiner PBC by polarization maintaining optical fibre.
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. according to claim 1 directly detect communication system based on the received dual-polarization QAM modulation of K-K, feature exists
In: the first KK converting unit KK1, the 2nd KK converting unit KK2, carrier auxiliary and data decision unit are digital signal
Processor.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560877A (en) * | 2019-01-24 | 2019-04-02 | 哈尔滨工业大学（深圳） | Communication system and method are directly detected based on the received dual-polarization QAM modulation of K-K |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560877A (en) * | 2019-01-24 | 2019-04-02 | 哈尔滨工业大学（深圳） | Communication system and method are directly detected based on the received dual-polarization QAM modulation of K-K |
| CN109560877B (en) * | 2019-01-24 | 2024-02-06 | 哈尔滨工业大学（深圳） | K-K receiving-based dual-polarization QAM modulation direct detection communication system and method |
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