CN106788738A - Passive optical network based on 2DcodedPAM4 modulation systems - Google Patents
Passive optical network based on 2DcodedPAM4 modulation systems Download PDFInfo
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- CN106788738A CN106788738A CN201611260205.9A CN201611260205A CN106788738A CN 106788738 A CN106788738 A CN 106788738A CN 201611260205 A CN201611260205 A CN 201611260205A CN 106788738 A CN106788738 A CN 106788738A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
-
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
-
- 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
- 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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
Abstract
The invention provides a kind of passive optical network based on 2D coded PAM4 modulation systems, including：Optical line terminal, branched system optical fiber, optical branching device, distribution type fiber-optic and some optical network units, the optical line terminal include 2D coded PAM4 data signal transmissions module, erbium-doped fiber amplifier and optical filter, wherein：The modulation system that data signal transmission module is used to initial data sequence is 2D coded PAM4.System in the present invention uses 2D coded PAM4 modulation systems, and the modulation system is by increasing the Euclidean distance between constellation point, so as to reduce the bit error rate.Passive optical network based on 2D coded PAM4 lifting system power budget to a certain extent.
Description
Technical field
The present invention relates to technical field of photo communication, in particular it relates to be based on the passive light of 2D coded PAM4 modulation systems
Network system.
Background technology
In recent years, with the continuous growth of user bandwidth demand, the capacity crisis of optical access network is extremely urgent.It is of future generation
PON system increasingly pays close attention to capacity higher, because bandwidth demand can considerably beyond existing GPON and EPON system
With the capacity for providing.In order to solve this problem, ITU-FSAN and IEEE is investigating high speed passive optical network always recently
Middle problem of the Single wavelength transmission more than 10Gbps.At present, some have spectrum efficiency higher advanced modulation formats
Everybody has been attracted widely to note, these modulation formats include：optical duobinary,electrical duobinary
And PAM4.Research shows, using these modulation formats the bandwidth that low bandwidth optical device brings can be overcome to limit.
Duobinary modulation gradually causes everybody concern, and this modulated signal spectral width is very narrow, only NRZ
The half of signal bandwidth, there is tolerance higher to dispersion.This characteristic causes that it is more suitable for High Speed Modulation and Transmission system.
Additionally, duobinary signals can be to luminous intensity direct detection, it is not necessary to which be concerned with decoding as DPSK, therefore cost is very big
Reduce.Y.Lim et al. had been published in article " the Evaluation of of Optical Fiber Technology in 2004
transmission performance in cost-effective optical duobinary transmission
utilizing modulator’s bandwidth or low-pass filter implemented by a single
Optical duobinary are successfully realized in capacitor ".Compared to traditional duobinary modulation schemes, the side of author
Case can reach similar Self-phase modulation (SPM) tolerance.
Usual electrical duobinary signals are postponed by low pass filter or by the data sequence that prelists
Obtained after being added filtering.Correlative study shows, the bandwidth of low pass filter only need to reach signal bandwidth 0.25 by effectively
Realize the conversion of NRZ to duobinary.Zhengxuan Li be published in Optics Express in 2015 in entitled " 28Gb/
s duobinary signal transmission over 40km based on 10GHz DML and PIN for
100Gb/s PON " are successfully realized the biography of 28Gbps electrical duobinary signals using 10GHz DML and PIN
It is defeated.
PAM4 is compared to optical duobinary, two kinds of modulation systems of electrical duobinary only by increasing
Plus amplitude leyel number increases spectrum efficiency, implementation is gradually ripe.PAM4 has great potentiality to support that two-forty is passed
It is defeated while improve cost efficiency, be strong Alternative modulation mode in NG-PON2.Therefore the present invention is absorbed on the basis of PAM4
Research.Recently, Zhengxuan Li are published in entitled " 100-Gb/s TWDM-PON in Optics Express in 2016
The three kinds of modulation systems that compared for hot topic of based on 10G optical devices "：NRZ、duobinary、PAM4.Text
Chapter points out modulation format of the PAM4 forms with respect to low order, and (such as OOK and duobinary) its remolding sensitivity is relatively low.25Gbps
How PAM4 then keeps high spectral efficiency and hoisting power budget compared to the small 10dB of PAM4 power budgets of identical bit
As problem demanding prompt solution.The alternative of one hoisting power budget is multidimensional coding modulation.J.Renaudier is published in
Entitled " Multi- in Optical Fiber Communication Conference and Exhibition in 2016
Dimension Coded PAM4Signaling for 100Gb/s Short-Reach Transceivers " are successfully realized
Short-distance transmission based on 100Gbps transceiver multidimensional coded PAM4.By this scheme, the input power of receiver end
0.8dB can be reduced.Therefore, the lifting of power budget causes that multidimensional coded PAM4 are modulated at great attraction in short-distance transmission
Power.
The content of the invention
For defect of the prior art, 2D coded PAM4 modulation systems are based on it is an object of the invention to provide one kind
Passive optical network.
According to the passive optical network based on 2D coded PAM4 modulation systems that the present invention is provided, including：Optical link
Terminal, branched system optical fiber, shunt, distribution type fiber-optic and some optical network units；The optical line terminal passes through feeder line light
Fibre is connected to optical branching device, and each optical network unit is connected to by distribution type fiber-optic after carrying out power branch by optical branching device.Number
The modulation system used to initial data sequence according to signal emission module is 2D coded PAM4.
Preferably, the optical line terminal includes 2D coded PAM4 data signal transmissions module, erbium-doped fiber amplifier
And optical filter, wherein：
The 2D coded PAM4 data signal transmissions modules are made up of data signal generator and optical modulator, are used for
Electric signals pending are produced, and optical signal is converted into optical modulator；
The erbium-doped fiber amplifier is used to carry out power amplification to optical modulator output optical signal；
The optical filter is used for frequency domain equalization, that is, carry out chirp management, and specifically the optical filter is equivalent to trap
Wave filter and frequency equalizer, for mitigating the dispersive influence that frequency chirp is caused.
Preferably, branched system optical fiber and distribution type fiber-optic total length can reach 40Km.
Preferably, the optical network unit includes：Photodetector and sampled data signal processing unit, wherein：
The photodetector, for receiving optical signal, and the optical signal that will be received is converted to electric signal；
The sampled data signal processing unit, for reverting to transmission information and transmitting the data-signal that sampling is obtained
To user terminal.
Preferably, the data signal generator feature in the 2D coded PAM4 data signal transmission modules is as follows：It is logical
16 constellation points that the combination of two dimension PAM4 constellations obtains in the case of two dimensional constellation are crossed, 16 will be mapped as per 3bits by mapping
One of 8 big constellations of spacing distance in individual constellation so that each constellation symbol is made up of two continuous PAM4 symbols, i.e. 2D
Coded PAM4 are equivalent to uncoded PAM4.
Preferably, the optical modulator in the 2D coded PAM4 data signal transmission modules is used：Directly modulated lasers,
Or externally modulated laser；The directly modulated lasers include using：Distributed feedback laser DFB, vertical cavity surface-emitting laser
Any one in device VSCEL, Distributed Bragg Reflection laser DBR.
Preferably, the optical filter in optical line terminal is used：Delay interferometer.
Preferably, the photodetector is used：Photodiode, or avalanche diode APD.
Preferably, the sampled data signal processing unit in optical network unit can adjudicate each 2D coded PAM4's
Constellation point；Assuming that the judgement domain area of each constellation point is then changed into for the judgement domain area of 1,2D coded PAM4 in 2D PAM4
2；2D coded PAM4 can be adjudicated by the judgement domain, and the thresholding refers to each 2D coded PAM4 constellation points institute
Judgement domain be 2 rhombus.
Compared with prior art, the present invention has following beneficial effect：
The present invention effectively realizes transmission of the 2D coded PAM4 data-signals in EPON, compared to tradition
The experimental system of PAM4 modulation systems, implementation of the present invention is simple, and the lower bit error rate can be realized under identical receiving power；
Compared to the passive optical network modulated based on PAM4, equalized data signal is transmitted, it is pre- that the present invention can obtain power higher
Calculate.Specifically, by contrasting discovery in passive optical network, 2D coded PAM4 show more preferable property compared to PAM4
Energy；When light BtB is transmitted, it is compared traditional PAM4 and can obtain the power ascension of 1.1dB, in standard single-mode fiber 20Km transmission
When, it is compared traditional PAM4 and can obtain the power ascension of 1.4dB.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the structured flowchart based on 2D coded PAM4 modulation systems provided by the present invention；
Fig. 2 (a) is the planisphere of 2D PAM4；
Fig. 2 (b) is the planisphere of 2D coded PAM4；
Fig. 3 (a) be system in light BtB transmit when, 18.75Gbps PAM4 signal eye diagrams；
Fig. 3 (b) be system in light BtB transmit when, 18.75Gbps 2D coded PAM4 signal eye diagrams；
Fig. 4 be Matlab analogue systems in, the comparison diagram of the PAM4 and 2D coded PAM4 bit error rates；
Fig. 5 be experimental system in, the comparison diagram of the bit error rates of the PAM4 and 2D coded PAM4 in the case of BtB and 20Km.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, some changes and improvements can also be made.These belong to the present invention
Protection domain.
Passive optical network based on 2D coded PAM4 provided by the present invention, as shown in figure 1, a kind of be based on 2D
The passive optical network structure of the straight straightening inspection of coded PAM4 modulation systems includes successively：2D coded PAM4 data are believed
Number transmitter module, erbium-doped fiber amplifier, optical filter, branched system optical fiber, optical branching, photodetector and sampled data signal
Processing unit.Initial signal sequence obtains modulation sequence by 2D coded PAM4 modules.The work of 2D coded PAM4 modules
Make principle as described above：2D coded PAM4 are represented and obtained by the combination of two-dimentional PAM4 constellations.Continuous two PAM4 symbols
Number combination 16 constellation points can obtaining in the case of two dimensional constellation.In this process, will be per 3bits by a mapping
It is mapped as one of 8 constellations in larger distance in 16 constellations.Each constellation symbol is made up of two continuous PAM4 symbols
Mean that 2D coded PAM4 equivalent to uncoded PAM4.As the 2D coded PAM4 and PAM4 that compare identical bit
During two kinds of modulation systems, 2D coded PAM4 need higher than PAM4 1/3 baud.This also show 2D coded PAM4 transmissions
Efficiency is 1.5bits/symbol.Under the cost of additional bandwidth, minimum Eustachian distance can increase to 2 times of original √, and Europe
The increase of formula distance can bring the reduction of BER.
Signal enters light directly modulated lasers after being modulated through 2D coded PAM4 modules, and directly modulated lasers can be by electric signal
It is changed into optical signal.Because transmitted signal bandwidth is higher than system bandwidth, transmission signal is had impaired by signal after bandwidth efficient channel.This
Outward, directly modulated lasers inevitably bring the frequency chirp, optical signal spectrum broadening can occur.Light make use of to filter in the present invention
Ripple device come eliminate the above influence.Only need to the relevant parameter by optical filter is adjusted, you can effectively recover signal.In this process
In, optical filter serves as a notch filter to mitigate the dispersive influence that frequency chirp is caused, while it is equal to simulate a frequency
Weighing apparatus.
Optical signal is turned by entering system photoelectric conversion module after attenuator by the optical signal after standard single-mode fiber
It is changed to electric signal.Electric signal is into carrying out after data sampling module being calculated under simple line.PAM4 can by three level come
Judgement.2D PAM4 can form 16 constellations of two-dimensional space, 2D coded PAM4 by have chosen in 16 constellations distance compared with
8 big constellation points are obtained.Assuming that the judgement domain area of each constellation point is the judgement of 1,2D coded PAM4 in 2D PAM4
Domain area is then changed into 2.Similarly, 2D coded PAM4 can also be adjudicated by thresholding, and only decision threshold here is
Judgement domain where each 2D coded PAM4 constellation point is 2 rhombus.
In order to confirm the feasibility of the system, instantiation explanation is next combined.
Signal transmitter uses directly modulation distributed feedback laser (DFB), the laser bandwidth in optical line terminal
It is 10GHz.Output wavelength 1550nm.The 2D coded PAM4 modulated signals speed loaded on laser is 18.75Gbps.
Optical fiber is standard single-mode fiber, and length is 40Km.
Light network unit end photodetector uses photoelectric diode (PIN) detector, with a width of 10GHz.
Fig. 2 (a), Fig. 2 (b) are respectively the planisphere of 2D PAM4 and 2D coded PAM4.Can be clear from seeing, 2D
16 constellation points are had in PAM4 planispheres, 8 constellation points are had in 2D coded PAM4 planispheres.2D coded PAM4 stars
Distance is more bigger than distance between PAM4 constellation point between seat point.
Fig. 3 (a), Fig. 3 (b) are respectively the corresponding eye pattern of 2D coded PAM4 optical signals and the corresponding eye of PAM4 optical signals
Figure.It is can be found that from eye pattern：There is a cycle for two code elements in 2D coded PAM4 eye patterns.
Fig. 4 is the comparison diagram of PAM4 and 2D coded PAM4 in system emulation.Contrast PAM4 and 2D coded PAM4's
Transmission performance finds that 2D coded PAM4 can lift the power gain of 2.3dB compared to PAM4 under same bit error rate.
Fig. 5 is Experimental comparison 18.75Gbps PAM4,18.75Gbps coded PAM4 and 25Gbps PAM4 in light BtB
With the transmission error rates figure after 20Km.From ber curve it can be found that：Compared to the passive optical network modulated based on PAM4,
Transmission equalized data signal, the present invention can obtain power budget higher.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make a variety of changes or change, this not shadow
Sound substance of the invention.In the case where not conflicting, feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (9)
1. a kind of passive optical network based on 2DcodedPAM4 modulation systems, it is characterised in that including：Optical line terminal,
Branched system optical fiber, shunt, distribution type fiber-optic and some optical network units；The optical line terminal is connected by feeder fiber
To optical branching device, each optical network unit is connected to by distribution type fiber-optic after carrying out power branch by optical branching device.Data-signal
The modulation system that transmitter module is used to initial data sequence is 2D coded PAM4.
2. the passive optical network based on 2D coded PAM4 modulation systems according to claim 1, its feature exists
In the optical line terminal includes the filtering of 2D coded PAM4 data signal transmissions module, erbium-doped fiber amplifier and light
Device, wherein：
The 2D coded PAM4 data signal transmissions modules are made up of data signal generator and optical modulator, for producing
Electric signals pending, and be converted to optical signal into optical modulator；
The erbium-doped fiber amplifier is used to carry out power amplification to optical modulator output optical signal；
The optical filter is used for frequency domain equalization, that is, carry out chirp management, and specifically the optical filter is equivalent to notch filter
Device and frequency equalizer, for mitigating the dispersive influence that frequency chirp is caused.
3. the passive optical network based on 2D coded PAM4 modulation systems according to claim 1, its feature exists
In branched system optical fiber and distribution type fiber-optic total length can reach 40Km.
4. the passive optical network based on 2D coded PAM4 modulation systems according to claim 1, its feature exists
In the optical network unit includes：Photodetector and sampled data signal processing unit, wherein：
The photodetector, for receiving optical signal, and the optical signal that will be received is converted to electric signal；
The sampled data signal processing unit, for the data-signal that obtains of sampling revert to transmission information and transmit to
Family end.
5. the passive optical network based on 2D coded PAM4 modulation systems according to claim 2, its feature exists
In the data signal generator feature in the 2D coded PAM4 data signal transmission modules is as follows：By two-dimentional PAM4 stars
The combination of seat obtains 16 constellation points in the case of two dimensional constellation, will be mapped as being spaced in 16 constellations per 3bits by mapping
One in preceding 8 constellations when distance is arranged from big to small so that each constellation symbol is by two continuous PAM4 set of symbols
Into that is, 2D coded PAM4 are equivalent to uncoded PAM4.
6. the passive optical network based on 2D coded PAM4 modulation systems according to claim 2, its feature exists
In the optical modulator in the 2D coded PAM4 data signal transmission modules is used：Directly modulated lasers, or external modulation swashs
Light device；The directly modulated lasers include using：Distributed feedback laser DFB, vertical cavity surface emitting laser VSCEL, distribution
Any one in formula Bragg reflection laser DBR.
7. the passive optical network based on 2D coded PAM4 modulation systems according to claim 2, its feature exists
In the optical filter in optical line terminal is used：Delay interferometer.
8. the passive optical network based on 2D coded PAM4 modulation systems according to claim 3, its feature exists
In the photodetector is used：Photodiode, or avalanche diode APD.
9. the passive optical network based on 2D coded PAM4 modulation systems according to claim 3, its feature exists
In the sampled data signal processing unit in optical network unit can adjudicate the constellation point of each 2D coded PAM4；Assuming that 2D
The judgement domain area of each constellation point is then changed into 2 for the judgement domain area of 1,2D coded PAM4 in PAM4；2D coded
PAM4 can be adjudicated by the judgement domain, and the thresholding refers to the judgement domain where each 2D coded PAM4 constellation point
It is 2 rhombus.
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| CN109347782A (en) * | 2018-09-26 | 2019-02-15 | 南京信息工程大学 | Probability manufacturing process based on asymmetric polygon modulation and bit-level ontology label |
| WO2019184225A1 (en) * | 2018-03-30 | 2019-10-03 | 烽火通信科技股份有限公司 | Method and system for extracting constellation diagram on optical module |
| CN114339490A (en) * | 2021-12-30 | 2022-04-12 | 杭州电子科技大学 | System and method for upgrading passive optical network based on PAM4 complement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019184225A1 (en) * | 2018-03-30 | 2019-10-03 | 烽火通信科技股份有限公司 | Method and system for extracting constellation diagram on optical module |
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| CN108989253A (en) * | 2018-09-26 | 2018-12-11 | 南京信息工程大学 | Light probability manufacturing process based on Rhombic modulation Yu symbol level part mark mode |
| CN109347782A (en) * | 2018-09-26 | 2019-02-15 | 南京信息工程大学 | Probability manufacturing process based on asymmetric polygon modulation and bit-level ontology label |
| CN108989253B (en) * | 2018-09-26 | 2020-11-10 | 南京信息工程大学 | Optical probability shaping method based on diamond modulation and symbol-level partial marking mode |
| CN109347782B (en) * | 2018-09-26 | 2020-12-29 | 南京信息工程大学 | Probability forming method based on asymmetric polygon modulation and bit-level body label |
| CN114339490A (en) * | 2021-12-30 | 2022-04-12 | 杭州电子科技大学 | System and method for upgrading passive optical network based on PAM4 complement |
| CN114339490B (en) * | 2021-12-30 | 2024-02-02 | 杭州电子科技大学 | PAM4 complement upgrade passive optical network based system and method |
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Application publication date: 20170531 |