CN205883255U - A wiener filtering system for high -speed light pulse amplitude modulation - Google Patents
A wiener filtering system for high -speed light pulse amplitude modulation Download PDFInfo
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- CN205883255U CN205883255U CN201620809418.1U CN201620809418U CN205883255U CN 205883255 U CN205883255 U CN 205883255U CN 201620809418 U CN201620809418 U CN 201620809418U CN 205883255 U CN205883255 U CN 205883255U
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- wiener filtering
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- amplitude modulation
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Abstract
The utility model provides a wiener filtering system for high -speed light pulse amplitude modulation, includes: mach ceng deer modulator and the carrier wave that links to each other with it respectively take place the end with PAM4 signal generation end, be used for the signal reception who transmits modulating signal's single mode fiber and have photoelectric detector to hold. The utility model is suitable for a high -speed PAM4 transmission platform adopts wiener filtering ware technique to carry out filtering to the signal, compares the LMS algorithm and has a fast advantage of processing speed, is receiving the luminous power when being 3dBm, can reduce the bit error rate of a magnitude of PAM4 signal under the same experiment condition to effectively reduce the algorithm complexity when improving transmission performance.
Description
Technical field
The utility model relates to the technology of a kind of optical communication field, specifically a kind of for 80Gbps light pulse amplitude
The low algorithm complex Wiener filtering system of modulation (PAM4).
Background technology
Digital Signal Processing (Digitalsignalprocessing, DSP) has in short distance light network is applied
The biggest advantage.Along with data center and the fast development of supercomputer, for research and the work of light network technology at a high speed
Cheng Kaifa is also faced with great opportunities and challenges.The Digital Signal Processing wherein used in transceiver can significantly improve
Signal quality, optimizes link transmission characteristic.
Through finding the retrieval of prior art, HenningB ü low etc. exists
" Electronicdispersioncompensation. " (" Journaloflightwavetechnology ", 2008,26
(1) discuss the existing Digital Signal Processing that can be used in optical communication system in: 158 167), equalize including forward direction,
Decision feedback equalization, maximal possibility estimation etc..On the other hand, decision-directed minimum based on lowest mean square root optimization method
Root-mean-square value algorithm (Leastmeansquareanddisciondirection) is also employed " 40Gb/ in optical communication system
sCAP32systemwithDD‐LMSequalizerforshortreachopticaltransmissions."
(" PhotonicsTe chnologyLetters ", 2013: 2,346 2349).But there are some defects in LMS DD algorithm, bag
Including optimization process complicated, filter effect is unstable.
Utility model content
This utility model for deficiencies of the prior art, proposes a kind of for high-speed optical pulse amplitude modulation(PAM)
Wiener filtering system, it is adaptable to high speed PAM4 transmission platform, uses Wiener filter technique to be filtered signal, compares LMS
Algorithm has the advantage that processing speed is fast, when received optical power is 3dBm, can reduce PAM4 signal under same experimental conditions
The bit error rate of one magnitude.
This utility model is achieved through the following technical solutions:
This utility model relates to a kind of Wiener filtering system for high-speed optical pulse amplitude modulation(PAM), including: Mach Zeng De
Your manipulator and the carrier wave generation end being attached thereto respectively and PAM4 signal generation end, for transmitting the single-mode optics of modulated signal
Fibre and the signal receiving end with photodetector.
Described carrier wave generation end be operation wavelength be the continuous light light source at 1.5 microns.
The detection by photodetector with for interpolation reconstruction, resampling and Wiener filtering of the described signal receiving end fills
Put composition.
Preferably, described Wiener filtering system farther includes Polarization Controller, and this Polarization Controller is arranged at Mach
Between Zeng Deer manipulator and single-mode fiber.
Preferably, described Wiener filtering system farther includes linear amplifier, and this linear amplifier is arranged at PAM4
Between signal generation end and single-mode fiber.
Preferably, described Wiener filtering system farther includes for docking the numeral that the collection of letters number carries out sampling and storing
Memory oscilloscope, this digital storage oscilloscope is arranged between photodetector and detection device.
Preferably, described detection device is connected with PAM4 signal generation end.
Technique effect
Compared with prior art, this utility model achieves PAM4 signal 80Gbps's on the transmission wave band of 1.5 microns
Total transmission capacity, and total transmission range of 9 kilometers, compare lowest mean square root filtering algorithm, have processing speed fast, it is achieved
The advantage such as simple.
Accompanying drawing explanation
Fig. 1 is Wiener filter schematic diagram used by this utility model；
Fig. 2 is this utility model system structure schematic diagram；
In figure: continuous light light source 1, Polarization Controller 2, MZ Mach-Zehnder 3, arbitrarily signal generating device 4, linearly put
Big device 5, standard single-mode fiber 6, photodetector 7, digital storage oscilloscope 8, direct current biasing 9, detection device 10；
Fig. 3 is the signal eye diagram that PAM4 transmission system obtains；
In figure: (a) is the eye pattern of electricity PAM4 signal, and (b) is the eye pattern of light back-to-back PAM4 signal, and (c) is 5 km transmission
After PAM4 signal eye diagram, (d) is the PAM4 signal eye diagram after 9 km transmission；
Fig. 4 is the PAM4 spectrogram that system obtains；
In figure: (a) is the PAM4 signal spectrum figure collected, (b) is the spectrogram of preferable PAM4 signal, and (c) is
The spectrogram of the PAM4 signal after LMS DD processes, (d) is the spectrogram of the PAM4 signal after LMS DD processes；
Fig. 5 is the comparison diagram of the Wiener filter used by this utility model and the filtering of lowest mean square root；
In figure: (a) is the relation of filter length and the bit error rate, (b) is the relation of running software time and the bit error rate, as
In the case of the visible same bit error rate of figure, Wiener filter processing speed is better than LMS DD.
Fig. 6 is the ber curve of PAM4 system transfers.
Detailed description of the invention
As it is shown in figure 1, the present embodiment includes: sampling process, autocorrelation matrix solution procedure, cross-correlation matrix solved
Journey, filter tap coefficients solution procedure.
The sample rate of described sampling process have to be larger than the twice of signal rate；Wherein filter tap coefficients solved
Journey employs matrix inversion and matrix multiple calculates.
As in figure 2 it is shown, described Wiener filtering system includes: continuous print radiant 1, for controlling the polarization state of continuous light
Polarization Controller 2, MZ Mach-Zehnder 3, for producing the arbitrarily signal generating device 4 of electric PAM4 signal at a high speed, using
The linear amplifier 5 of MZ Mach-Zehnder 3, standard single-mode fiber 6, photodetector 7 is driven in amplifying signal amplitude
With for docking the digital storage oscilloscope 8 number carrying out sampling and storing of collecting mail.
Described continuous light light source 1 peak power output is 20dBm, and operation wavelength is at 1.5 microns.
The effective bandwidth of described MZ Mach-Zehnder 3 is 17GHz, and extinction ratio is 25dB.
Described AWG (Arbitrary Waveform Generator) 4 is as PAM4 signal generation end, and its effective bandwidth is 25GHz, maximum sample rate
Being 64GSa/s, the sample rate used in the present embodiment is 40GSa/s.
Described photodetector 7 effective bandwidth is 25GHz, and responsiveness is 0.8A/W.
Described digital storage oscilloscope 8 effective bandwidth is 59GHz, and sample rate is 160GSa/s.
PAM4 signal eye diagram that the present embodiment is obtained by above technology is as it is shown on figure 3, in figure: (a) is electricity PAM4 signal
Eye pattern, (b) is the eye pattern of light back-to-back PAM4 signal, and (c) is the PAM4 signal eye diagram after 5 km transmission, and (d) is 9 kilometers
PAM4 signal eye diagram after transmission；
The PAM4 signal spectrum figure that the present embodiment is obtained by above technology, and the Wiener filtering skill that the present embodiment uses
Art, the signal spectrum obtained, as shown in Figure 4, in figure: (a) is the PAM4 signal spectrum figure collected, (b) is preferable
The spectrogram of PAM4 signal, (c) is the spectrogram of the PAM4 signal after LMS DD processes, and (d) is through LMS DD process
After the spectrogram of PAM4 signal；
As it is shown in figure 5, in figure: (a) is the relation of filter length and the bit error rate, and (b) is running software time and error code
The relation of rate, as can be seen in the case of same bit error rate, Wiener filter processing speed is better than LMS DD.
As shown in Figure 6, for the ber curve of PAM4 system transfers, as can be seen by using Wiener filter,
80Gbps PAM4 signal bit error rate after 9km fiber-optic transfer is less than the lower limit of forward error correction.
Above-mentioned be embodied as can by those skilled in the art on the premise of without departing substantially from this utility model principle and objective with
Different modes carries out local directed complete set to it, protection domain of the present utility model be as the criterion with claims and not by above-mentioned specifically
Implementing to be limited, each implementation in the range of it is all by the constraint of this utility model.
Claims (7)
1. the Wiener filtering system for high-speed optical pulse amplitude modulation(PAM), it is characterised in that including: mach zhender is modulated
Device and the carrier wave generation end being attached thereto respectively and PAM4 signal generation end, for transmit modulated signal single-mode fiber and
Signal receiving end with photodetector.
Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) the most according to claim 1, is characterized in that, described
Carrier wave generation end be operation wavelength be the continuous light light source at 1.5 microns.
Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) the most according to claim 1, is characterized in that, described
The signal receiving end detection device by photodetector with for interpolation reconstruction, resampling and Wiener filtering forms.
Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) the most according to claim 1, is characterized in that, described
Wiener filtering system farther includes Polarization Controller, and this Polarization Controller is arranged at MZ Mach-Zehnder and single-mode fiber
Between.
Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) the most according to claim 1, is characterized in that, described
Wiener filtering system farther includes linear amplifier, this linear amplifier be arranged at PAM4 signal generation end and single-mode fiber it
Between.
Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) the most according to claim 3, is characterized in that, described
Wiener filtering system farther includes for docking the digital storage oscilloscope that the collection of letters number carries out sampling and storing, this stored digital
Oscillograph is arranged between photodetector and detection device.
7., according to the Wiener filtering system for high-speed optical pulse amplitude modulation(PAM) described in claim 3 or 6, it is characterized in that, institute
The detection device stated is connected with PAM4 signal generation end.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585660A (en) * | 2020-04-20 | 2020-08-25 | 复旦大学 | Terahertz wave signal generator based on dual-polarization MZM modulator and communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585660A (en) * | 2020-04-20 | 2020-08-25 | 复旦大学 | Terahertz wave signal generator based on dual-polarization MZM modulator and communication system |
| CN111585660B (en) * | 2020-04-20 | 2022-12-16 | 复旦大学 | Terahertz wave signal generator based on dual-polarization MZM modulator and communication system |
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Effective date of registration: 20191118 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee after: Ma Lin Address before: 4, No. 555, Lane 3111, 201401 West Ring Road, Shanghai, Fengxian District, -590 Patentee before: SHANGHAI NET MILES TECHNOLOGY CO.,LTD. Effective date of registration: 20191118 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Co-patentee after: Du Jiangbing Patentee after: Ma Lin Co-patentee after: Zhang Wenjia Co-patentee after: Bai Linbin Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Ma Lin |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200311 Address after: 200240 Shanghai city Minhang District Jianchuan Road No. 951 Building 5 layer 1 Patentee after: Shanghai Guangzhi Technology Co.,Ltd. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Co-patentee before: Du Jiangbing Patentee before: Ma Lin Co-patentee before: Zhang Wenjia Co-patentee before: Bai Linbin |
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Effective date of registration: 20200713 Address after: 518000 office building 201, Yuyang building, No. 13, Gaoxin North 4th Road, songpingshan community, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Taibikang Communication Technology Co.,Ltd. Address before: 200240 Shanghai city Minhang District Jianchuan Road No. 951 Building 5 layer 1 Patentee before: Shanghai Guangzhi Technology Co.,Ltd. |
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