CN209250652U - The coherent reception communication system of the dual-polarization QAM modulation of DSP-free - Google Patents
The coherent reception communication system of the dual-polarization QAM modulation of DSP-free Download PDFInfo
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- CN209250652U CN209250652U CN201920074363.8U CN201920074363U CN209250652U CN 209250652 U CN209250652 U CN 209250652U CN 201920074363 U CN201920074363 U CN 201920074363U CN 209250652 U CN209250652 U CN 209250652U
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Abstract
The utility model provides a kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free, it is characterized by comprising signal receiving ends and signal transmitting terminal, the signal receiving end includes laser, beam splitter, circulator C1, frequency mixer, balanced detector, clock recovery and data judging module, the signal transmitting terminal includes Polarization Controller PC, circulator C2, polarization beam apparatus PBS, I/Q modulator IQM1, faraday rotation mirror FRM1, I/Q modulator IQM2, faraday rotation mirror FRM2, polarization beam combiner PBC, the light that the laser projects is after the beam splitter beam splitting, enter the frequency mixer as local oscillator light emission all the way；1 port of the circulator C1 is injected as signal carrier all the way and is exported by 2 ports of circulator C1.The beneficial effects of the utility model are: frequency shift (FS) and phase difference is not present in local oscillator light and signal carrier, it is therefore not necessary to carry out carrier auxiliary.
Description
Technical field
The utility model relates to the relevant of the dual-polarization QAM modulation of short distance optic communication more particularly to a kind of DSP-free
Receive communication system.
Background technique
With flourishing for the business such as data center, 5G and big data, the demand of global communication flow is presented fast
Fast growth trend.In order to meet the communicating requirement of the technologies such as cloud computing and Internet of Things, data center interconnects (data center
Interconnect, DCI) having become short distance transmission system is mainly directed towards target at present.According to Cisco's global cloud exponential forecasting,
The information interaction amount of 2020 DCI is up to 15 Zbit, increases twice compared to 2017.Among these, nearly 77% communication
It is interacted inside data center, the behaviors such as main generation, storage, processing and verifying including data.It is mutual in data center
Join in communication system, high transfer rate, big transmission capacity and lower power consumption are design communication systems firstly the need of consideration.
Traditional data center, most of straight inspections combined using pulse amplitude modulated signal and direct detection mode are logical
Letter system.The main advantage of this communication plan essentially consists in that transmission capacity is big, and system structure is simple, and cost is relatively low.With logical
From 400Gbit/s to Tbit/s when magnitude leap, traditional direct detection mode will be extremely limited letter system velocity, limit
System tradition directly detects the reason of communication system key factor in the modulated signal of bandwidth of a device and low frequency spectrum efficiency.
The coherent communication side that relevant detection, the advanced modulation format of spectral efficient and digital signal processing module combine
Case has become preferred option of the middle length away from communication system, and major advantage is that the modulation of various dimensions signal can be achieved, lower
Receiver sensitivity.In coherent optical communication system, the main power consumption of system is at the subsequent digital signal in receiving end
It manages module (DSP).Specifically, for the coherent optical communication system of palarization multiplexing, the main power consumption of system is mended from dispersion
It repays, the modules such as polarization recovery and phase recovery.
If the above-mentioned damage in coherent optical communication system, this DSP-free can be compensated by other means
The coherent optical communication system of (no DSP) will play an increasingly important role in the internet of further generation data center.
For the compensation for realizing above-mentioned effect, it is mainly the following technical solution at present.First of all for elimination dispersion to letter
Number influence, the central wavelength of carrier wave, makes it work in O wave band in adjustable system.In O wave band, the dispersion of optical fiber is 0,
So as to eliminate influence of the dispersion for system.For local oscillator light and signal light because of frequency caused by phase and frequency is inconsistent
Exactly emitting laser is divided into two bundles by photo-coupler with phase noise, most direct mode partially, it is a branch of for signal
Modulation and transmission, in addition it is a branch of by accurately delay line come the phase of adjustment signal.Then in optical receiving end, two-beam is mixed
Frequency device carries out mixing and beat frequency, to eliminate the influence of frequency deviation and phase noise for signal.
In data center's interconnection, optical signal is mainly influenced by the random birefringence of optical fiber.The random birefringence of optical fiber
It will cause two orthogonal polarisation states transmitting aliasing of transmission.In order to eliminate influence of the polarization effect for signal, generally by
Emit signal end and a radiofrequency signal is added, by detecting the value of radiofrequency signal come feedback control Polarization Controller, realizes polarization
The compensation of aliasing.But feedback control amount up to three of Aliasing compensation are polarized in above scheme, are realized complex.It is same herein
When, the effect of polarization recovery is influenced by the IQ imbalance of radio-frequency power, detector sensitivity and optical transceiver.
Therefore, in order to guarantee system stability and superperformance, providing a kind of simple and effective polarization recovery scheme is very
It is necessary to.
Summary of the invention
In order to solve the problems in the prior art, the utility model provides the dual-polarization QAM modulation of DSP-free a kind of
Coherent reception communication system.
The utility model provides a kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free, including letter
Number receiving end and signal transmitting terminal, the signal receiving end includes laser, beam splitter, circulator C1, frequency mixer, balance detection
Device, clock recovery and data judging module, the signal transmitting terminal include Polarization Controller PC, circulator C2, polarization beam apparatus
PBS, I/Q modulator IQM1, faraday rotation mirror FRM1, I/Q modulator IQM2, faraday rotation mirror FRM2, polarization beam combiner
PBC, the light that the laser projects enter the frequency mixer as local oscillator light emission all the way after the beam splitter beam splitting；Make all the way
1 port of the circulator C1 is injected for signal carrier and is exported by 2 ports of circulator C1, after the Polarization Controller PC
It into circulator C2, is inputted by 2 ports of circulator C2, the output of 3 ports is X, Y polarised light by polarization beam apparatus PBS points, partially
The effect of vibration controller PC is in order to which the power for controlling two polarization state lights is equal, and X polarised light is modulated through the I/Q modulator IQM1
Afterwards by entering the polarization beam combiner PBC after faraday rotation mirror FRM1 reflection, Y polarised light is through the I/Q modulator IQM2
By entering the polarization beam combiner PBC after faraday rotation mirror FRM2 reflection after modulation, ring is returned to by polarization maintaining optical fibre later
1 port of shape device C2, the 2 ports output through circulator C2 is back to 2 ports of circulator C1 by original optical path, by circulator C1's
The output of 3 ports enters frequency mixer, coherent detection is carried out with local oscillator light, finally, the output after the balanced detector balance detection
Clock information is extracted by clock recovery and data judging module and is made decisions.
The signal receiving end further includes phase delay device, beam splitter beam splitting as a further improvement of the utility model,
Local oscillator light afterwards injects the frequency mixer after phase delay device.
The signal receiving end and the signal transmitting terminal pass through single mode optical fiber as a further improvement of the utility model,
Connection, signal carrier is after the output of 2 ports of circulator C1, the polarization of arriving signal transmitting terminal after single mode optical fiber transmission
Controller PC, X, Y polarised light is returned to 1 port of circulator C2 by polarization maintaining optical fibre, through annular after polarization beam combiner PBC closes beam
The 2 ports output of device C2 is back to 2 ports of circulator C1 by Polarization Controller PC, single mode optical fiber.
The signal transmitting terminal further includes circulator C4 and circulator C3, X inclined as a further improvement of the utility model,
Light shake after I/Q modulator IQM1 modulation, the 1 port input through circulator C4,2 ports are exported to the Faraday rotation
Mirror FRM1, after faraday rotation mirror FRM1 reflection, the 2 ports input through circulator C4,3 ports are exported to the polarization
Bundling device PBC；Y polarised light is after I/Q modulator IQM2 modulation, and the 1 port input through circulator C3,2 ports are exported to institute
Faraday rotation mirror FRM2 is stated, after faraday rotation mirror FRM2 reflection, 2 ports through circulator C3 are inputted, and 3 ports are defeated
Out to the polarization beam combiner PBC.
The beam splitter is connected by polarization maintaining optical fibre and the phase delay device as a further improvement of the utility model,
It connects, the beam splitter is connect by polarization maintaining optical fibre with 1 port of the circulator C1, and the phase delay device passes through polarization maintaining optical fibre
It is connect with the frequency mixer, 3 ports of the circulator C2 are connect by polarization maintaining optical fibre with the polarization beam apparatus PBS, described
Polarization beam apparatus PBS passes through polarization maintaining optical fibre respectively and connect with the I/Q modulator IQM1, I/Q modulator IQM2, the I/Q modulator
IQM1 is connect by polarization maintaining optical fibre with 1 port of the circulator C4, and 2 ports of the circulator C4 pass through polarization maintaining optical fibre and institute
Faraday rotation mirror FRM1 connection is stated, 3 ports of the circulator C4 are connected by polarization maintaining optical fibre and the polarization beam combiner PBC
It connects, the I/Q modulator IQM2 is connect by polarization maintaining optical fibre with 1 port of the circulator C3,2 ports of the circulator C3
Connect by polarization maintaining optical fibre with the faraday rotation mirror FRM2,3 ports of the circulator C3 by polarization maintaining optical fibre with it is described
Polarization beam combiner PBC connection, the polarization beam combiner PBC are connect by polarization maintaining optical fibre with 1 port of the circulator C2.
The coherent reception communication system completely works in O wave band as a further improvement of the utility model,.
The beneficial effects of the utility model are: through the above scheme, local oscillator light and signal carrier there is no frequency shift (FS) and
Phase difference, it is therefore not necessary to carry out carrier auxiliary.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the coherent reception communication system of the dual-polarization QAM modulation of DSP-free of the utility model.
Specific embodiment
The utility model is described in further detail for explanation and specific embodiment with reference to the accompanying drawing.
As shown in Figure 1, the utility model provides a kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free
System, in order to reduce the influence of effect of dispersion, which works in O wave band (1260-1360), and the wave band is in SMF zero-dispersion wavelength
Near.Therefore, the effect of dispersion of optical fiber can be ignored substantially, without carrying out the dispersion compensation of numeric field.In fact, counting quotient at present
It is also O wave with the standard operation window that 100GBASE-LR4 makees the system of transmitting module in data center's communication link
Section, under this condition, the dispersion that signal transmission 10km is introduced can be ignored.
As shown in Figure 1, in order to remove the carrier recovery block in DSP algorithm, using from by the way of zero-difference detection.Laser
The light carrier of 11 transmittings is after 12 beam splitting of beam splitter, wherein being used as signal carrier all the way, another way is as local oscillator light and receives letter
Number carry out beat frequency.Meanwhile the phase matched that phase delay device 13 has realized local oscillator light and signal light, phase are introduced in local oscillator optical path
Delay can be by being directly added into one section of optical fiber or utilizing the realization of the means such as electrooptic effect.By the above-mentioned means, intrinsic light and signal
Frequency shift (FS) and phase difference is not present in carrier wave, it is therefore not necessary to carry out carrier auxiliary.
In order to eliminate influence of the polarization aliasing to signal, the utility model proposes link schemes as shown in Figure 1 to realize partially
The self compensation of vibration aliasing.As shown in Figure 1, laser 11 is located at signal receiving end 1, the signal carrier of transmitting after transmission link extremely
Signal transmitting terminal 2 is reflected after the modulation of dual-polarization I/Q modulator by faraday rotation mirror, returns to former chain through polarization maintaining optical fibre
Road.In stable optical fiber link, since the polarization state speed of rotation of random birefringence introducing is generally in 10krad/s-
200krad/s, and in data center's internal communication link (500m-10km), when round-trip light passes through needed for optical fiber same point
Between up to, within the so short time, it is believed that the Jones matrix of optical fiber link is simultaneously
Do not change, under this condition, by some transmitting light polarization state and through faraday rotation mirror return change the time after light it is inclined
Polarization state is vertical.Therefore, the design of the link realizes the self compensation of polarization aliasing to lose the small part power of signal carrier.
In addition, nonlinear effect and polarization mode dispersion can be ignored in short haul connection.
As shown in Figure 1, a kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free, specifically includes signal
Receiving end 1 and signal transmitting terminal 2, the signal receiving end 1 include laser 11, beam splitter 12, circulator C1, frequency mixer 14,
Balanced detector 15, clock recovery and data judging module 16, the signal transmitting terminal 2 include Polarization Controller PC, circulator
C2, polarization beam apparatus PBS, I/Q modulator IQM1, faraday rotation mirror FRM1, I/Q modulator IQM2, faraday rotation mirror FRM2,
Polarization beam combiner PBC, the light that the laser 11 projects enter as local oscillator light emission described all the way after 12 beam splitting of beam splitter
Frequency mixer 14；1 port of the circulator C1 is injected as signal carrier all the way and is exported by 2 ports of circulator C1, through institute
Enter circulator C2 after stating Polarization Controller PC, is inputted by 2 ports of circulator C2,3 ports output, by polarization beam apparatus PBS
It is divided into X, Y polarised light, the effect of Polarization Controller PC is in order to which the power for controlling two polarization state lights is equal, described in X polarised light warp
By entering the polarization beam combiner PBC, Y polarised light warp after faraday rotation mirror FRM1 reflection after I/Q modulator IQM1 modulation
By entering the polarization beam combiner PBC after faraday rotation mirror FRM2 reflection after the I/Q modulator IQM2 modulation, later
1 port that circulator C2 is returned by polarization maintaining optical fibre, 2 ports through circulator C2, which are exported, is back to the 2 of circulator C1 by original optical path
Port enters frequency mixer 14 by the 3 ports output of circulator C1, coherent detection is carried out with local oscillator light, finally, the balance detection
Output after 15 balance detection of device is extracted clock information by clock recovery and data judging module 16 and is made decisions.
As shown in Figure 1, the signal receiving end 1 further includes phase delay device 13, the local oscillator light warp after 12 beam splitting of beam splitter
The frequency mixer 14 is injected after phase delay device 13.
As shown in Figure 1, the signal receiving end 1 is connect with the signal transmitting terminal 2 by single mode optical fiber 3, signal carrier
Through circulator C1 2 ports output after, through the single mode optical fiber 3 transmission after arriving signal transmitting terminal 2 Polarization Controller PC, X,
Y polarised light is returned to 1 port of circulator C2,2 ports through circulator C2 by polarization maintaining optical fibre after polarization beam combiner PBC closes beam
Output is back to 2 ports of circulator C1 by Polarization Controller PC, single mode optical fiber.
As shown in Figure 1, the signal transmitting terminal 2 further includes that circulator C4 and circulator C3, X polarised light are modulated through the IQ
After device IQM1 modulation, the 1 port input through circulator C4,2 ports are exported to the faraday rotation mirror FRM1, through the farad
After revolving mirror FRM1 reflection, the 2 ports input through circulator C4,3 ports are exported to the polarization beam combiner PBC；Y polarised light
After I/Q modulator IQM2 modulation, the 1 port input through circulator C3,2 ports are exported to the faraday rotation mirror
FRM2, after faraday rotation mirror FRM2 reflection, the 2 ports input through circulator C3,3 ports export to the polarization and close
Beam device PBC.
As shown in Figure 1, the beam splitter 12 is connect by polarization maintaining optical fibre with the phase delay device 13, the beam splitter 12
It is connect by polarization maintaining optical fibre with 1 port of the circulator C1, the phase delay device 13 is mixed by polarization maintaining optical fibre with described
Device 14 connects, and 3 ports of the circulator C2 are connect by polarization maintaining optical fibre with the polarization beam apparatus PBS, the polarization beam splitting
Device PBS passes through polarization maintaining optical fibre respectively and connect with the I/Q modulator IQM1, I/Q modulator IQM2, and the I/Q modulator IQM1 passes through
Polarization maintaining optical fibre is connect with 1 port of the circulator C4, and 2 ports of the circulator C4 pass through polarization maintaining optical fibre and the faraday
3 ports of revolving mirror FRM1 connection, the circulator C4 are connect by polarization maintaining optical fibre with the polarization beam combiner PBC, the IQ
Modulator IQM2 is connect by polarization maintaining optical fibre with 1 port of the circulator C3, and 2 ports of the circulator C3 pass through polarization-maintaining light
Fine to connect with the faraday rotation mirror FRM2,3 ports of the circulator C3 pass through polarization maintaining optical fibre and the polarization beam combiner
PBC connection, the polarization beam combiner PBC are connect by polarization maintaining optical fibre with 1 port of the circulator C2.
A kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free provided by the utility model, belongs to short
Apart from optical communication field, the low-power consumption in data center's internal communication, the dual-polarization without Digital Signal Processing (DSP) are applied
The homodyne coherent reception communication plan of QAM modulation.
A kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free provided by the utility model, on the one hand,
By the way of coherent reception, therefore, the modulation of four dimensions can be carried out to signal, relatively traditional amplitude modulation-is directly
Detection scheme greatly improves spectrum efficiency and receiving sensitivity.On the other hand, it is designed by reasonable optical fiber link, it can
To remove DSP module complicated in partially coherent reception, including dispersion compensation, carrier auxiliary and polarization Aliasing compensation, greatly
Ground reduces power consumption, so that coherent reception scheme is suitable for short haul connection.
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 (6)
1. a kind of coherent reception communication system of the dual-polarization QAM modulation of DSP-free, it is characterised in that: including signal receiving end
With signal transmitting terminal, the signal receiving end includes laser, beam splitter, circulator C1, frequency mixer, balanced detector, clock
Recovery and data judging module, the signal transmitting terminal includes Polarization Controller PC, circulator C2, polarization beam apparatus PBS, IQ tune
Device IQM1 processed, faraday rotation mirror FRM1, I/Q modulator IQM2, faraday rotation mirror FRM2, polarization beam combiner PBC, it is described to swash
The light that light device projects enters the frequency mixer as local oscillator light emission all the way after the beam splitter beam splitting；It is used as signal carrier all the way
It injects 1 port of the circulator C1 and is exported by 2 ports of circulator C1, circulator is entered after the Polarization Controller PC
C2 is inputted by 2 ports of circulator C2, and the output of 3 ports is X, Y polarised light, Polarization Controller PC by polarization beam apparatus PBS points
Effect be in order to which the power for controlling two polarization state lights is equal, X polarised light through the I/Q modulator IQM1 modulation after by the method
Enter the polarization beam combiner PBC after drawing revolving mirror FRM1 to reflect, Y polarised light is after I/Q modulator IQM2 modulation by institute
Enter the polarization beam combiner PBC after stating faraday rotation mirror FRM2 reflection, returns to 1 end of circulator C2 by polarization maintaining optical fibre later
Mouthful, the output of 2 ports through circulator C2 is back to 2 ports of circulator C1 by original optical path, by 3 ports of circulator C1 export into
Enter frequency mixer, carry out coherent detection with local oscillator light, finally, output after the balanced detector balance detection by clock recovery and
Data decision module is extracted clock information and is made decisions.
2. the coherent reception communication system of the dual-polarization QAM modulation of DSP-free according to claim 1, feature exist
In: the signal receiving end further includes phase delay device, described in the local oscillator light after beam splitter beam splitting is injected after phase delay device
Frequency mixer.
3. the coherent reception communication system of the dual-polarization QAM modulation of DSP-free according to claim 2, feature exist
In: the signal receiving end is connect with the signal transmitting terminal by single mode optical fiber, and signal carrier is defeated through 2 ports of circulator C1
After out, Polarization Controller PC, X, Y polarised light of arriving signal transmitting terminal is through polarization beam combiner after single mode optical fiber transmission
PBC close beam after, by polarization maintaining optical fibre return circulator C2 1 port, through circulator C2 2 ports output by Polarization Controller PC,
Single mode optical fiber is back to 2 ports of circulator C1.
4. the coherent reception communication system of the dual-polarization QAM modulation of DSP-free according to claim 3, feature exist
In: the signal transmitting terminal further includes circulator C4 and circulator C3, X polarised light after I/Q modulator IQM1 modulation, warp
1 port of circulator C4 inputs, and 2 ports are exported to the faraday rotation mirror FRM1, anti-through the faraday rotation mirror FRM1
After penetrating, the 2 ports input through circulator C4,3 ports are exported to the polarization beam combiner PBC；Y polarised light is through the I/Q modulator
After IQM2 modulation, the 1 port input through circulator C3,2 ports are exported to the faraday rotation mirror FRM2, through the faraday
After revolving mirror FRM2 reflection, the 2 ports input through circulator C3,3 ports are exported to the polarization beam combiner PBC.
5. the coherent reception communication system of the dual-polarization QAM modulation of DSP-free according to claim 4, feature exist
In: the beam splitter is connect by polarization maintaining optical fibre with the phase delay device, and the beam splitter passes through polarization maintaining optical fibre and the ring
1 port of shape device C1 connects, and the phase delay device is connect by polarization maintaining optical fibre with the frequency mixer, and the 3 of the circulator C2
Port is connect by polarization maintaining optical fibre with the polarization beam apparatus PBS, and the polarization beam apparatus PBS passes through polarization maintaining optical fibre and institute respectively
I/Q modulator IQM1, I/Q modulator IQM2 connection are stated, the I/Q modulator IQM1 passes through polarization maintaining optical fibre and the 1 of the circulator C4
2 ports of port connection, the circulator C4 are connect by polarization maintaining optical fibre with the faraday rotation mirror FRM1, the circulator
3 ports of C4 are connect by polarization maintaining optical fibre with the polarization beam combiner PBC, and the I/Q modulator IQM2 passes through polarization maintaining optical fibre and institute
The 1 port connection of circulator C3 is stated, 2 ports of the circulator C3 are connected by polarization maintaining optical fibre and the faraday rotation mirror FRM2
It connects, 3 ports of the circulator C3 are connect by polarization maintaining optical fibre with the polarization beam combiner PBC, and the polarization beam combiner PBC is logical
Polarization maintaining optical fibre is crossed to connect with 1 port of the circulator C2.
6. the coherent reception communication system of the dual-polarization QAM modulation of DSP-free according to claim 1, feature exist
In: the coherent reception communication system completely works in O wave band.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510669A (en) * | 2019-01-15 | 2019-03-22 | 哈尔滨工业大学（深圳） | The coherent reception communication means and system of the dual-polarization QAM modulation of DSP-free |
| CN110768729A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Medium-far infrared band grating and optical fiber coupling multi-beam coherent receiving system |
-
2019
- 2019-01-15 CN CN201920074363.8U patent/CN209250652U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510669A (en) * | 2019-01-15 | 2019-03-22 | 哈尔滨工业大学（深圳） | The coherent reception communication means and system of the dual-polarization QAM modulation of DSP-free |
| CN109510669B (en) * | 2019-01-15 | 2023-10-31 | 哈尔滨工业大学（深圳） | Method and system for coherent reception communication of double-polarization QAM modulation of DSP-free |
| CN110768729A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Medium-far infrared band grating and optical fiber coupling multi-beam coherent receiving system |
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