CN107094049A - The system and method for DD PON downlink processings - Google Patents
The system and method for DD PON downlink processings Download PDFInfo
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- CN107094049A CN107094049A CN201710240778.3A CN201710240778A CN107094049A CN 107094049 A CN107094049 A CN 107094049A CN 201710240778 A CN201710240778 A CN 201710240778A CN 107094049 A CN107094049 A CN 107094049A
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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
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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
- H04B10/2507—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
Abstract
The present invention provides a kind of system and method for DD PON downlink processings, wherein, the system includes：Transmitting terminal, power splitter and multiple receiving terminals, power splitter are connected between transmitting terminal and each receiving terminal；Transmitting terminal includes baseband signal emitter, semiconductor laser, optical modulator, image intensifer and the first single-mode fiber；There is the second single-mode fiber in each receiving terminal respectively, the second single-mode fiber is connected with power splitter；Optical signal after optical modulator generation modulation；Image intensifer amplifies the power of the optical signal after modulation according to preset formula A=B+C D*E F；Power splitter receives the optical signal after the power amplification that image intensifer is sent by the first single-mode fiber, and the optical signal after each road power amplification is sent into each receiving terminal by individual second single-mode fiber；Each receiving terminal is according to the optical signal demodulation downlink data after power amplification.The performance number of useful signal is avoided to be faded to zero, the available frequency range of first transmission sideband of increase system.
Description
Technical field
The present invention relates to network technique field, more particularly to a kind of system and method for DD-PON downlink processings.
Background technology
With the development of Technology of Light Access Network, direct detection passive optical-fiber network (Direct Detection Passive
Optical Network, abbreviation DD-PON) downlink system has been widely applied in Technology of Light Access Network.For example, DD-PON
Include a kind of direct detection OFDM (Direct Detection Orthogonal in downlink system
Frequency Division Multiplexing, DD-OFDM) technology, it is a kind of novel multi-carrier modulation demodulation skill
Art, has the advantages that spectrum efficiency is high, anti-channel dispersion ability is strong, is conducive to improving passive optical-fiber network (Passive
Optical Network, abbreviation PON) power system capacity and transmission performance.But in DD-PON downlink systems, it may appear that by
The problem of dispersion causes power fading.
In the prior art, the influence of power fading is caused in order to suppress dispersion, generally using following several Restrain measurements.The
Such as one kind, reduces the mode of modulator chirp value, for conventional modulator, positive chirp is in the case of positive dispersion transmission, meeting
Power fading is aggravated, therefore size is biased to reduce modulator chirp by optimizing modulator, slows down the influence of power fading.
Second, the mode of high frequency preemphasis algorithm, because power fading has the similar form of expression with the high frequency fading characteristic of device,
Therefore the purpose of suppression power fading can be reached by improving the power of high frequency subcarriers.The third, the side of many sideband transmissions
Formula, the power with frequency that power fading shows as subcarrier on frequency spectrum rises and falls, so by being loaded in the high subcarrier of power
The method of the low subcarrier zero filling of data, power can avoid the influence of power fading.
But in the prior art, the mode of the first reduction modulator chirp value, or cause the Bandwidth-Constrained of signal, it is adjustable
Scope diminishes, and then it is poor to suppress the effect of power fading；The mode of second of high frequency preemphasis algorithm, algorithm complex compared with
Height, and then cost is higher；The mode of the third many sideband transmission, can make it that the utilization rate of signal bandwidth is not high, and then suppress work(
The effect of rate decline is poor.
The content of the invention
The present invention provides a kind of system and method for DD-PON downlink processings, to solve signal bandwidth in the prior art
Utilization rate is not high, the problem of effect of suppression power fading is poor.
It is an aspect of the present invention to provide a kind of system of DD-PON downlink processings, including：
Transmitting terminal, power splitter and at least one receiving terminal, wherein, the power splitter is connected to the transmission
Between end and each receiving terminal；
The transmitting terminal includes baseband signal emitter, semiconductor laser, optical modulator, image intensifer and first
Single-mode fiber, the baseband signal emitter, the semiconductor laser are connected with the optical modulator respectively, the light modulation
Device is connected with the image intensifer, and the image intensifer is connected with first single-mode fiber；
Include second single-mode fiber, second single-mode fiber and the power in each described receiving terminal respectively
Beam splitter is connected；
The optical modulator, for receiving the electric signal under the default modulation format that the baseband signal emitter is sent,
And the light carrier that the semiconductor laser is sent is received, and the electric signal under the default modulation format is modulated to light load
On ripple, the optical signal after generation modulation；
The image intensifer, the optical signal after the modulation for receiving the optical modulator transmission, according to default
Formula amplifies the power of the optical signal after the modulation, the optical signal after generation power amplification；Wherein, preset formula is A=B
+ C-D*E-F, A are the power of light carrier, and B is default power budget, and C is the sensitivity of receiving terminal, and D is transmission range, and E is
Optical fiber loss factor, F is device loss value；
The power splitter, for receiving the power that the image intensifer is sent by first single-mode fiber
Optical signal after amplification, according to the optical signal after the power amplification, the optical signal after generation at least two-way power amplification, and pin
To per the optical signal after power amplification all the way, the optical signal after power amplification all the way is sent to by second single-mode fiber
One receiving terminal；
Each receiving terminal, for receiving the optical signal after the power amplification, believes according to the light after the power amplification
Number demodulation downlink data.
Another aspect of the present invention is to provide a kind of method of DD-PON downlink processings, including：
Optical modulator receives the electric signal under the default modulation format that baseband signal emitter is sent, and receives semiconductor
The light carrier that laser is sent, and the electric signal under the default modulation format is modulated on light carrier, after generation modulation
Optical signal；
Image intensifer receives the optical signal after the modulation that the optical modulator is sent, and institute is amplified according to preset formula
State the power of the optical signal after modulating, the optical signal after generation power amplification；Wherein, preset formula is A=B+C-D*E-F, A
For the power of light carrier, B is default power budget, and C is the sensitivity of receiving terminal, and D is transmission range, and E is fibre loss system
Number, F is device loss value；
Power splitter is received after the power amplification that the image intensifer is sent by first single-mode fiber
Optical signal, according to the optical signal after the power amplification, the optical signal after generation at least two-way power amplification, and for per all the way
Optical signal after power amplification, a reception is sent to by the optical signal after power amplification all the way by the second single-mode fiber
End；
Each receiving terminal receives the optical signal after the power amplification, descending according to the optical signal demodulation after the power amplification
Data.
The solution have the advantages that：The DD-PON being made up of by providing transmitting terminal and at least one receiving terminal is descending
The system of processing, transmitting terminal is connected by power splitter with each receiving terminal；Transmitting terminal includes baseband signal emitter, semiconductor
Laser, optical modulator, image intensifer and the first single-mode fiber, baseband signal emitter, semiconductor laser respectively with light
Modulator is connected, and optical modulator is connected with image intensifer, and image intensifer is connected with the first single-mode fiber；Divide in each receiving terminal
Not Bao Kuo second single-mode fiber, the second single-mode fiber is connected with power splitter；Optical modulator, for receiving baseband signal
Electric signal under the default modulation format that emitter is sent, and the light carrier that semiconductor laser is sent is received, and will be default
Electric signal under modulation format is modulated on light carrier, the optical signal after generation modulation；Image intensifer, for receiving light modulation
Optical signal after the modulation that device is sent, amplifies the power of the optical signal after modulation according to preset formula, generates power amplification
Optical signal afterwards；Wherein, preset formula is A=B+C-D*E-F, and A is the power of light carrier, and B is default power budget, and C is
The sensitivity of receiving terminal, D is transmission range, and E is optical fiber loss factor, and F is device loss value；Power splitter, for receiving
Optical signal after the power amplification that image intensifer is sent by the first single-mode fiber, according to the optical signal after power amplification, generation
Optical signal at least after two-way power amplification, and for per the optical signal after power amplification all the way, after power amplification all the way
Optical signal is sent to a receiving terminal by the second single-mode fiber；Each receiving terminal, the optical signal after amplifying for receiving power, root
According to the optical signal demodulation downlink data after power amplification.So as to which the performance number that effectively prevent useful signal is faded to zero, indirectly
The available frequency range for adding the transmission sideband of system first, the available bandwidth of Transmission system is being added to a certain degree,
Increase orthogonal frequency division multiplexing passive fiber optic network (Orthogonal Frequency Division Multiplexing-
Passive Optical Network, OFDM-PON) system capacity；Also, the high emission luminous power of OLT transmitting terminals weakens
Demand of the signal in transmitting procedure to line amplifier and power amplifier, and algorithm complex is low, and then effective drop
Low system cost.
Brief description of the drawings
Fig. 1 is the structural representation of the system for the DD-PON downlink processings that the embodiment of the present invention one is provided；
Fig. 2 is the structural representation of the system for the DD-PON downlink processings that the embodiment of the present invention two is provided；
Fig. 3 is the flow chart of the method for the DD-PON downlink processings that the embodiment of the present invention three is provided；
Fig. 4 is the flow chart of the method for the DD-PON downlink processings that the embodiment of the present invention four is provided.
Reference：
| 1- transmitting terminals | 2- receiving terminals |
| 3- baseband signal emitters | 4- semiconductor lasers |
| 5- optical modulators | 6- image intensifers |
| The single-mode fibers of 7- first | 8- power splitters |
| 9- photodetectors | 10-DSP units |
| 11- low pass filters | 12-Volterra wave filter balance modules |
| 13-OFDM symbol de-maps modules | The single-mode fibers of 14- second |
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of the system for the DD-PON downlink processings that the embodiment of the present invention one is provided, as shown in figure 1,
The system of the present embodiment, including：Transmitting terminal 1, power splitter 8 and at least one receiving terminal 2, wherein, power splitter 8 connects
It is connected between transmitting terminal 1 and each receiving terminal 2；
Transmitting terminal 1 includes baseband signal emitter 3, semiconductor laser 4, optical modulator 5, image intensifer 6 and first
Single-mode fiber 7, baseband signal emitter 3, semiconductor laser 4 are connected with optical modulator 5 respectively, optical modulator 5 and light amplification
Device 6 is connected, and image intensifer 6 is connected with the first single-mode fiber 7；
Include second single-mode fiber 14, the second single-mode fiber 14 and power splitter 8 in each receiving terminal 2 respectively
Connection；
Optical modulator 5, the electric signal under default modulation format for receiving the transmission of baseband signal emitter 3, Yi Jijie
The light carrier that semiconductor laser 4 is sent is received, and the electric signal under default modulation format is modulated on light carrier, generation modulation
Optical signal afterwards；
Image intensifer 6, the optical signal after modulation for receiving the transmission of optical modulator 5, amplifies according to preset formula and adjusts
The power of optical signal after system, the optical signal after generation power amplification；Wherein, preset formula is A=B+C-D*E-F, and A is light
The power of signal, B is default power budget, and C is the sensitivity of receiving terminal 2, and D is transmission range, and E is optical fiber loss factor, F
For device loss value；
Power splitter 8, believes for receiving the light after the power amplification that image intensifer 6 is sent by the first single-mode fiber 7
Number, according to the optical signal after power amplification, the optical signal after generation at least two-way power amplification, and for per power amplification all the way
Optical signal afterwards, a receiving terminal 2 is sent to by the optical signal after power amplification all the way by the second single-mode fiber 14；
Each receiving terminal 2, the optical signal after amplifying for receiving power, according to line number under the optical signal demodulation after power amplification
According to.
In the present embodiment, specifically, providing a kind of system of downlink processing, the system of the downlink processing is a kind of great Rong
Measure high branching ratio OFDM-PON downlink systems.The system includes a transmitting terminal 1 and at least one receiving terminal 2, wherein, hair
Sending end 1 is optical line terminal (Optical Line Terminal, abbreviation OLT) transmitting terminal 1, and receiving terminal 2 is optical network unit
(Optical Network Unit, abbreviation ONU) receiving terminal 2.
In this application, Large Copacity refers to the transmission capacity of system；In general, transmission capacity=number of channel * often believes
The transmission rate in road.With reference to OFDM-PON scenes signified in the application, the ONU that can be supported in the Large Copacity=PON
The each ONU of number * can support to transmit signal rate.
The system provided in the present embodiment includes an OLT transmitting terminal 1, a power splitter 8, n OUN receiving terminal
2.Specifically, being connected between OLT transmitting terminals 1 and n OUN receiving terminal 2 by a power splitter 8；OLT transmitting terminals 1 are launched
Machine includes baseband signal emitter 3, semiconductor laser 4, optical modulator 5, the single-mode fiber 7 of image intensifer 6 and first,
Baseband signal emitter 3, semiconductor laser 4 are connected with optical modulator 5 respectively, and optical modulator 5 is connected with image intensifer 6, light
Amplifier 6 is connected with the first single-mode fiber 7.Wherein, optical modulator 5 can use electroabsorption modulator (Electro
Absorption Modulator, abbreviation EAM).Include second single-mode fiber 14 in each receiving terminal 2 respectively, each the
Two single-mode fibers 14 are connected with power splitter 8 respectively.
Electric signal under default modulation format is sent to optical modulator 5 by baseband signal emitter 3.Semiconductor laser 4
Generate semiconductor laser 4 in light carrier, the present embodiment and produce the light carrier that wavelength is 1550nm, frequency is 193.1THz；Half
Conductor laser 4 is by optical carrier to optical modulator 5.
Optical modulator 5 is according to the electric signal and light carrier under default modulation format, by the telecommunications under default modulation format
Number it is modulated on light carrier, and then generates the optical signal after modulation；Then, optical modulator 5 sends out the optical signal after modulation
Give image intensifer 6.
Image intensifer 6 amplifies the power of the optical signal after modulation according to preset formula, the light letter after generation power amplification
Number；Wherein, preset formula is：A=B+C-D*E-F, A are the power of light carrier, and B is default power budget, and C is receiving terminal 2
Sensitivity, D is transmission range, and E is optical fiber loss factor, and F is device loss value；Power budget B value is default, its root
Determined according to the transmission range of system with carrying ONU numbers are thought；The sensitivity C of receiving terminal 2 is determined according to system self character
's.And then according to OFDM (Orthogonal Frequency Division Multiplexing, OFDM) telecommunications
Number watt level, power budget size, transmission range, loss value size, regulation light EDFA increase incident optical powers, will light letter
Number power amplification, for example, in embodiments of the present invention, the power of optical signal can be amplified to 20dBm.
Optical signal after power amplification is sent to power splitter 8 by image intensifer 6 by the first single-mode fiber 7；Its
In, from 60km G.652 (B1) first single-mode fiber 7, fibre-optical dispersion is 16ps/ (km*nm), and nonlinear fiber coefficient is
2.6e-20m2/w。
Power splitter 8 receives the optical signal after the power amplification that image intensifer 6 is sent by the first single-mode fiber 7, so
Afterwards, power splitter 8 is according to the optical signal after power amplification, the optical signal after generation n road power amplifications, then, power beam splitting
Device 8 is directed to per the optical signal after power amplification all the way, is sent out the optical signal after power amplification all the way by the second single-mode fiber 14
The photodetector 9 in an ONU receiving terminal 2 is given, wherein, photodetector 9 uses the photodetection with a width of 12.6GHz
Device 9.
And then, the optical signal after power amplification is sent to each OUN receiving terminals 2 by transmitting terminal 1, and then, each OUN connects
Receiving end 2 is received after the optical signal after power amplification, according to the optical signal demodulation downlink data after power amplification.
In the present embodiment, by after the power amplification of optical signal so that OLT transmitting terminals by increase transmitting luminous power come
Cause fiber nonlinear effect, fiber nonlinear effect here refers mainly to self phase modulation, promotes caused by dispersion
The valley point position of power fading is moved to high frequency direction, and the available bandwidth of Transmission system is being added to a certain degree；Also, OLT
The high emission luminous power of transmitting terminal reduces demand of the signal to line amplifier and power amplifier in transmitting procedure, and then
Effectively reduce system cost.
The present embodiment is by provide the DD-PON downlink processings being made up of transmitting terminal 1 and at least one receiving terminal 2
System, transmitting terminal 1 is connected by power splitter 8 with each receiving terminal 2；Transmitting terminal 1 includes baseband signal emitter 3, semiconductor and swashed
Light device 4, optical modulator 5, the single-mode fiber 7 of image intensifer 6 and first, baseband signal emitter 3, semiconductor laser 4 are distinguished
It is connected with optical modulator 5, optical modulator 5 is connected with image intensifer 6, image intensifer 6 is connected with the first single-mode fiber 7；Each
Include second single-mode fiber 14 in receiving terminal 2 respectively, the second single-mode fiber 14 is connected with power splitter 8；Optical modulator
5, the electric signal under default modulation format for receiving the transmission of baseband signal emitter 3, and reception semiconductor laser 4 are sent out
The light carrier sent, and the electric signal under default modulation format is modulated on light carrier, the optical signal after generation modulation；Light is put
Big device 6, the optical signal after modulation for receiving the transmission of optical modulator 5 amplifies the light after modulation according to preset formula and believed
Number power, generation power amplification after optical signal；Wherein, preset formula is A=B+C-D*E-F, and A is the power of light carrier, B
For default power budget, C is the sensitivity of receiving terminal 2, and D is transmission range, and E is optical fiber loss factor, and F is device loss
Value；Power splitter 8, the optical signal after the power amplification sent for receiving image intensifer 6 by the first single-mode fiber 7, root
According to the optical signal after power amplification, the optical signal after generation at least two-way power amplification, and be directed to per after power amplification all the way
Optical signal, a receiving terminal 2 is sent to by the optical signal after power amplification all the way by the second single-mode fiber 14；Each receiving terminal 2,
Optical signal after amplifying for receiving power, according to the optical signal demodulation downlink data after power amplification.So as to effectively prevent
The performance number of useful signal is faded to zero, the available frequency range of first transmission sideband of system is indirectly added, certain
Degree adds the available bandwidth of Transmission system, increases the capacity of OFDM-PON systems；Also, the high emission of OLT transmitting terminals
Luminous power reduces demand of the signal to line amplifier and power amplifier in transmitting procedure, and algorithm complex is low, enters
And effectively reduce system cost.
Fig. 2 is the structural representation of the system for the DD-PON downlink processings that the embodiment of the present invention two is provided, in embodiment one
On the basis of, as shown in Fig. 2 the system of the present embodiment,
Receiving terminal 2, including：Photodetector 9 and Digital Signal Processing (Digital Signal Processing, DSP)
Unit 10, wherein, photodetector 9 is connected with DSP unit 10；Photodetector 9, is passed through for receiving power beam splitter 8
Optical signal after the power amplification all the way that two single-mode fibers 14 are sent, telecommunications is converted to by the optical signal after power amplification all the way
Number；DSP unit 10, for demodulating downlink data according to electric signal.
Receiving terminal 2, in addition to：Low pass filter 11, wherein, it is mono- that low pass filter 11 is connected to photodetector 9 and DSP
Between member 10；Low pass filter 11, the electric signal for receiving the transmission of photodetector 9, and low pass filtered is generated according to electric signal
Electric signal after ripple processing, DSP unit 10 is sent to by the electric signal after low-pass filtering treatment.
DSP unit 10, including：Volterra wave filters balance module 12 and OFDM symbol De-mapping module 13,
Volterra wave filters balance module 12 is connected with OFDM symbol De-mapping module 13；Volterra wave filters balance module 12,
For carrying out the electric signal after damage equilibrium treatment, generation damage equilibrium treatment to the electric signal after low-pass filtering treatment, and will
Electric signal after damage equilibrium treatment is sent to OFDM symbol De-mapping module 13；OFDM symbol De-mapping module 13, for pair
The electric signal damaged after equilibrium treatment carries out Digital Signal Processing, demodulates downlink data.
Baseband signal emitter 3, specifically for：Random generation serial signal；Signal transacting is carried out to serial signal, with life
Electric signal under default modulation format.
In the present embodiment, specifically, including an OLT transmitting terminal 1 in the system that the present embodiment is provided, n OUN connects
Receiving end 2.Specifically, the emitter of OLT transmitting terminals 1 includes baseband signal emitter 3, semiconductor laser 4, optical modulator 5, light
The single-mode fiber 7 of amplifier 6 and first, baseband signal emitter 3, semiconductor laser 4 are connected with optical modulator 5 respectively, light
Modulator 5 is connected with image intensifer 6, and image intensifer 6 is connected with the first single-mode fiber 7.One ONU receiving terminal 2 includes photoelectricity
Detector 9, low pass filter 11, DSP unit 10；Low pass filter 11 is connected between photodetector 9 and DSP unit 10；
DSP unit 10 includes Volterra wave filters balance module 12 and OFDM symbol De-mapping module 13, Volterra filtering
Device balance module 12 is connected with OFDM symbol De-mapping module 13.Wherein, pass through between OLT transmitting terminals 1 and n OUN receiving terminal 2
One power splitter 8 is connected.
First, baseband signal emitter 3 generates serial signal at random, and then baseband signal emitter 3 enters to serial signal
Row signal transacting, to generate the electric signal under default modulation format.Wherein, by taking ofdm signal as an example, 3 pairs of baseband signal emitter
Serial signal carry out signal transacting process be：The modulation format of quadrature amplitude modulation is set, the electric signal generated at random is entered
The quadrature amplitude modulation processing of row 16- quadrature amplitude modulations (Quadrature Amplitude Modulation, abbreviation QAM),
Generate the electric signal after quadrature amplitude modulation processing；FFT scales and effective sub-carrier number are determined, after orthogonal amplitude modulation process
Electric signal carry out serioparallel exchange processing, generation serioparallel exchange after electric signal, for example, determine FFT step-length be 256, effectively
Sub-carrier number is 106, and the signal after then being modulated to 16-QAM carries out serioparallel exchange；Pre- is set to the electric signal after serioparallel exchange
If the cyclic prefix of length, electric signal of the generation with cyclic prefix, for example, setting the length of cyclic prefix to be FFT step-lengths
1/16；Parallel-serial conversion processing is carried out to the electric signal with cyclic prefix, OFDM electric signals are generated.
For example, QAM modulation form, effective sub-carrier number, FFT scales, cyclic prefix are set respectively to serial signal
Length etc., generates the ofdm signal with a width of 10.0GHz.
Then, the electric signal under default modulation format is sent to optical modulator 5 by baseband signal emitter 3, also, is partly led
Body laser 4 generates light carrier and by optical carrier to optical modulator 5.
Then, optical modulator 5 is according to the electric signal and light carrier under default modulation format, by under default modulation format
Electric signal is modulated on light carrier, the optical signal after generation modulation, and then, optical modulator 5 sends out the optical signal after modulation
Give image intensifer 6.
Image intensifer 6, by the power of the optical signal after amplifying modulation, generates the light after power amplification according to preset formula
Signal；Wherein, preset formula is A=B+C-D*E-F, and A is the power of light carrier, and B is default power budget, and C is receiving terminal 2
Sensitivity, D is transmission range, and E is optical fiber loss factor, and F is device loss value.
Optical signal after power amplification is sent to power splitter 8 by image intensifer 6 by the first single-mode fiber 7；Its
In, from 60km G.652 (B1) first single-mode fiber 7, fibre-optical dispersion is 16ps/ (km*nm), and nonlinear fiber coefficient is
2.6e-20m2/w。
Power splitter 8 receives the optical signal after the power amplification that image intensifer 6 is sent by the first single-mode fiber 7, so
Afterwards, power splitter 8 is according to the optical signal after power amplification, the optical signal after generation n road power amplifications, then, power beam splitting
Device 8 is directed to per the optical signal after power amplification all the way, is sent out the optical signal after power amplification all the way by the second single-mode fiber 14
The photodetector 9 in an ONU receiving terminal 2 is given, wherein, photodetector 9 uses the photodetection with a width of 12.6GHz
Device 9.
Photodetector 9 in each ONU receiving terminal 2 is received after the optical signal after power amplification all the way, by one
Optical signal after the power amplification of road is converted to electric signal.Due in each ONU receiving terminal 2, in photodetector 9 and DSP
A low pass filter 11 is connected between unit 10, so that the photodetector 9 in each ONU receiving terminal 2 sends out electric signal
Low pass filter 11 is given, low pass filter 11 filters out high-frequency signal and carried out after analog to digital conversion, after generation low-pass filtering treatment
Electric signal, the electric signal after low-pass filtering treatment issued DSP unit 10 by low pass filter 11.
Then, the Volterra wave filters balance module 12 in the DSP unit 10 in each ONU receiving terminal 2 is received
Electric signal after low-pass filtering treatment, then Volterra wave filters balance module 12 electric signal after low-pass filtering treatment is entered
Electric signal after row damage equilibrium treatment, generation damage equilibrium treatment, now, Volterra wave filters balance module 12 can be right
Distracter in the electric signal changed by the optical signal after power amplification is handled, meanwhile, to directly being examined due to receiver
The square-law characteristic received is surveyed, causes to receive the non-linear SSII distracters produced containing beat frequency in signal, is also handled；
Wherein, Volterra wave filters balance module 12 uses three ranks " sparse type " time domain Volterra wave filters.
Then, the Volterra wave filters balance module 12 in the DSP unit 10 in each ONU receiving terminal 2 will be damaged
Electric signal after equilibrium treatment is sent to the OFDM symbol De-mapping module 13 in DSP unit 10, OFDM symbol De-mapping module
Electric signal after 13 pairs of damage equilibrium treatments is carried out after Digital Signal Processing, demodulates downlink data；Wherein, Digital Signal Processing
Process include serioparallel exchange, cyclic prefix, Fast Fourier Transform (FFT) processing and symbol de-maps removed, for example, going here and there and turning
The process changed is that baseband signal is carried out into serioparallel exchange, removes 1/16 cyclic prefix that length is equal to FFT step-lengths.Then, often
One ONU receiving terminal 2 can be just handled downlink data.
By above procedure, when for the power of the optical signal of OLT transmitting terminals being 4dBm, 20dBm, transmission range is
60km, the power spectrum signal of the optical signal generated to OLT transmitting terminals is analyzed；According to experimental result, it can obtain due to color
The effect such as scattered, modulator chirp causes signal power to decline, and decline valley point is located at 6GHz, when transmission power increases to 20dBm,
Because dispersion causes first decline valley point position of power fading to be moved to beyond 10GHz scopes, useful signal effectively prevent
Performance number is faded to zero, indirectly adds the available frequency range of first transmission sideband of system, increases OFDM-PON systems
The capacity of system.
Also, the Volterra wave filters balance module 12 of the present embodiment can be to being turned by the optical signal after power amplification
Distracter in the electric signal of change is handled, meanwhile, the square-law characteristic to directly detecting reception due to receiver causes to connect
The non-linear SSII distracters produced in the collection of letters number containing beat frequency, are also handled.
In the present embodiment, second order time domain Volterra filtering can be respectively adopted in Volterra wave filters balance module 12
Device, three ranks " complete " time domain Volterra wave filters, three ranks " sparse type " time domain Volterra wave filters carry out com-parison and analysis, can be with
The signal to noise ratio snr raising curve of three is analyzed, can be obtained, the signal to noise ratio snr relative to first-order linear wave filter is carried
High curve, three ranks " sparse type " time domain Volterra wave filters can improve system SNR improvement, when it is to three ranks " complete "
The tap coefficient of domain Volterra wave filters is optimized, and extracts the tap coefficient played the role of a nucleus to balanced nonlinear impairments
Wave filter so that filter construction is simpler；And three ranks " sparse type " time domain Volterra wave filters and three ranks " complete "
The portfolio effect that time domain Volterra wave filters are damaged to mission nonlinear is suitable, but three ranks " sparse type " time domain Volterra is filtered
Ripple device system complexity is reduced.
The index table of the Volterra wave filters of table 1
Table 1 is from transmitting optical power, receiver sensitivity, power budget, transmission range and receiving terminal 2
The tap coefficient scales of Volterra wave filters, complexity angularly, to suppressing a variety of non-linear based on Volterra wave filters
The feasibility of the high branching ratio OFDM-PON downlink system schemes of Large Copacity of damage carries out systematic analysis technique, it can be seen that reduce
Filter tap coefficients, can reduce the complexity of receiving terminal 2.
System of the present embodiment by providing a DD-PON downlink processing, including an OLT transmitting terminal 1, n OUN connect
Receiving end 2, the emitter of OLT transmitting terminals 1 includes baseband signal emitter 3, semiconductor laser 4, optical modulator 5, image intensifer
6th, the first single-mode fiber 7；Baseband signal emitter 3, semiconductor laser 4 are connected with optical modulator 5 respectively, optical modulator 5 with
Image intensifer 6 is connected, and image intensifer 6 is connected with the first single-mode fiber 7.Baseband signal emitter 3 carries out signal to serial signal
Processing, to generate the electric signal under default modulation format.Baseband signal emitter 3 sends the electric signal under default modulation format
To optical modulator 5, also, semiconductor laser 4 generates light carrier and by optical carrier to optical modulator 5.Optical modulator 5
According to the electric signal under default modulation format, light carrier, the electric signal under default modulation format is modulated on light carrier, generation is adjusted
Optical signal after modulation is sent to image intensifer 6 by the optical signal after system, then, optical modulator 5.The basis of image intensifer 6
Preset formula is by the power of the optical signal after amplifying modulation, the optical signal after generation power amplification；Wherein, preset formula is：
Power=power budget+receiver sensitivity-transmission range * optical fiber loss factors-device loss value of optical signal.Image intensifer
Optical signal after power amplification, by the first single-mode fiber 7, is sent to power splitter 8 by 6.Power splitter 8 is according to power
Optical signal after amplification, the optical signal after generation n road power amplifications, then, for the optical signal after power amplification all the way, by one
Optical signal after the power amplification of road is sent to an ONU end, then, and ONU end is descending according to the optical signal demodulation after power amplification
Data.So as to which the performance number that effectively prevent useful signal is faded to zero, indirectly adds first transmission sideband of system
Available frequency range, increases the capacity of OFDM-PON systems.Also, the photodetector 9 in each ONU end receives work(
, will be all the way after power amplification after optical signal after the power amplification all the way that rate beam splitter 8 is sent by the second single-mode fiber 14
Optical signal be converted to electric signal；Electric signal is sent to low pass filter 11 by the photodetector 9 in each ONU end, low
Bandpass filter 11 filters out high-frequency signal and carried out after analog to digital conversion, the electric signal after generation low-pass filtering treatment, low pass filter
Electric signal after low-pass filtering treatment is issued DSP unit 10 by 11；Volterra wave filters balance module 12 in DSP unit 10
The electric signal after low-pass filtering treatment is received, then Volterra wave filters balance module 12 is to the electricity after low-pass filtering treatment
Signal carries out the electric signal after damage equilibrium treatment, generation damage equilibrium treatment, now, Volterra wave filters balance module 12
Distracter in the electric signal that is changed by the optical signal after power amplification can be handled, meanwhile, to due to receiver
The square-law characteristic that directly detection is received, causes to receive the non-linear SSII distracters produced containing beat frequency in signal, also carries out
Processing.
Fig. 3 is the flow chart of the method for the DD-PON downlink processings that the embodiment of the present invention three is provided, as shown in figure 3, this reality
The method for applying example, including：
Step 501, optical modulator receive the electric signal under the default modulation format that baseband signal emitter is sent, Yi Jijie
The light carrier that semiconductor laser is sent is received, and the electric signal under default modulation format is modulated on light carrier, generation modulation
Optical signal afterwards；
Step 502, image intensifer receive the optical signal after the modulation that optical modulator is sent, and are amplified according to preset formula and adjusted
The power of optical signal after system, the optical signal after generation power amplification；Wherein, preset formula is A=B+C-D*E-F, and A is light
The power of carrier wave, B is default power budget, and C is the sensitivity of receiving terminal, and D is transmission range, and E is optical fiber loss factor, F
For device loss value；
The light that step 503, power splitter receive after the power amplification that image intensifer is sent by the first single-mode fiber is believed
Number, according to the optical signal after power amplification, the optical signal after generation at least two-way power amplification, and for per power amplification all the way
Optical signal afterwards, a receiving terminal is sent to by the optical signal after power amplification all the way by the second single-mode fiber；
Optical signal after step 504, the amplification of each receiving terminal receiving power, it is descending according to the optical signal demodulation after power amplification
Data.
The method of the DD-PON downlink processings of the present embodiment can perform the descending places of DD-PON that the embodiment of the present invention one is provided
The system of reason, its realization principle is similar, and here is omitted.
System of the present embodiment by providing the DD-PON downlink processings being made up of transmitting terminal and at least one receiving terminal,
Transmitting terminal is connected by power splitter with each receiving terminal；Transmitting terminal includes baseband signal emitter, semiconductor laser, light and adjusted
Device processed, image intensifer and the first single-mode fiber, baseband signal emitter, semiconductor laser are connected with optical modulator respectively,
Optical modulator is connected with image intensifer, and image intensifer is connected with the first single-mode fiber；Include one in each receiving terminal respectively
Second single-mode fiber, the second single-mode fiber is connected with power splitter；Optical modulator, sends for receiving baseband signal emitter
Default modulation format under electric signal, and the light carrier that semiconductor laser is sent is received, and by under default modulation format
Electric signal be modulated on light carrier, generation modulation after optical signal；Image intensifer, the tune for receiving optical modulator transmission
Optical signal after system, amplifies the power of the optical signal after modulation, the optical signal after generation power amplification according to preset formula；
Wherein, preset formula is A=B+C-D*E-F, and A is the power of light carrier, and B is default power budget, and C is sensitive for receiving terminal
Degree, D is transmission range, and E is optical fiber loss factor, and F is device loss value；Power splitter, passes through for receiving image intensifer
Optical signal after the power amplification that first single-mode fiber is sent, according to the optical signal after power amplification, generation at least two-way power
Optical signal after amplification, and for the optical signal after per power amplification all the way, the is passed through by the optical signal after power amplification all the way
Two single-mode fibers are sent to a receiving terminal；Each receiving terminal, the optical signal after amplifying for receiving power, after power amplification
Optical signal demodulation downlink data.So as to which the performance number that effectively prevent useful signal is faded to zero, indirectly adds system
The available frequency range of first transmission sideband, is adding the available bandwidth of Transmission system, is increasing OFDM- to a certain degree
The capacity of PON system；Also, the high emission luminous power of OLT transmitting terminals reduces signal in transmitting procedure to line amplifier
With the demand of power amplifier, and algorithm complex is low, and then effectively reduces system cost.
Fig. 4 is the flow chart of the method for the DD-PON downlink processings that the embodiment of the present invention four is provided, in the base of embodiment three
On plinth, as shown in figure 4, the method for the present embodiment,
Step 504, including：
Step 5041, the photodetector receiving power beam splitter being directed in each receiving terminal, receiving terminal pass through
Optical signal after the power amplification all the way that two single-mode fibers are sent, electric signal is converted to by the optical signal after power amplification all the way；
Step 5042, the low pass filter being directed in each receiving terminal, receiving terminal receive what photodetector was sent
Electric signal, and the electric signal after low-pass filtering treatment is generated according to electric signal, the electric signal after low-pass filtering treatment is sent to
DSP unit.
Step 5043, the DSP unit being directed in each receiving terminal, receiving terminal demodulate downlink data according to electric signal.
Wherein, step 5043, specifically include：
The Volterra wave filter balance modules for the DSP unit being directed in each receiving terminal, receiving terminal are to low pass filtered
Electric signal after ripple processing carries out the electric signal after damage equilibrium treatment, generation damage equilibrium treatment, and will damage equilibrium treatment
Electric signal afterwards is sent to the OFDM symbol De-mapping module of DSP unit；
At the OFDM symbol De-mapping module for the DSP unit being directed in each receiving terminal, receiving terminal is balanced to damage
Electric signal after reason carries out Digital Signal Processing, demodulates downlink data.
Before step 501, in addition to：
Step 601, baseband signal emitter generate serial signal at random, and carry out signal transacting to serial signal, with life
Electric signal under default modulation format.
The method of the DD-PON downlink processings of the present embodiment can perform the descending places of DD-PON that the embodiment of the present invention two is provided
The system of reason, its realization principle is similar, and here is omitted.
System of the present embodiment by providing a DD-PON downlink processing, including an OLT transmitting terminal, n OUN are received
End, OLT transmitting terminal emitters include baseband signal emitter, semiconductor laser, optical modulator, image intensifer, the first list
Mode fiber；Baseband signal emitter, semiconductor laser are connected with optical modulator respectively, and optical modulator is connected with image intensifer,
Image intensifer is connected with the first single-mode fiber.Baseband signal emitter carries out signal transacting to serial signal, to generate default tune
Electric signal under form processed.Electric signal under default modulation format is sent to optical modulator, also, half by baseband signal emitter
Conductor laser generates light carrier and by optical carrier to optical modulator.Optical modulator is according to the telecommunications under default modulation format
Number, light carrier, the electric signal under default modulation format is modulated on light carrier, generation modulation after optical signal, then, light
Optical signal after modulation is sent to image intensifer by modulator.Image intensifer according to preset formula by amplify modulation after light
The power of signal, the optical signal after generation power amplification；Wherein, preset formula is：Power=power budget+reception of optical signal
Clever sensitivity-transmission range * optical fiber loss factors-device loss value.Image intensifer is by the first single-mode fiber, by power amplification
Optical signal afterwards is sent to power splitter.Power splitter is according to the optical signal after power amplification, after generation n road power amplifications
Optical signal, then, for the optical signal after power amplification all the way, the optical signal after power amplification all the way is sent to one
ONU end, then, ONU end is according to the optical signal demodulation downlink data after power amplification.So as to effectively prevent useful signal
Performance number is faded to zero, indirectly adds the available frequency range of first transmission sideband of system, increases OFDM-PON systems
The capacity of system.Also, the photodetector in each ONU end receives what power splitter was sent by the second single-mode fiber
All the way after the optical signal after power amplification, the optical signal after power amplification all the way is converted into electric signal；In each ONU end
Photodetector electric signal is sent to low pass filter, low pass filter filters out high-frequency signal and carried out after analog to digital conversion,
The electric signal after low-pass filtering treatment is generated, the electric signal after low-pass filtering treatment is issued DSP unit by low pass filter；DSP
Volterra wave filter balance modules in unit receive the electric signal after low-pass filtering treatment, then Volterra wave filters
Balance module carries out the electric signal after damage equilibrium treatment, generation damage equilibrium treatment to the electric signal after low-pass filtering treatment,
Now, Volterra wave filters balance module can be to the distracter in the electric signal that is changed by the optical signal after power amplification
Handled, meanwhile, the square-law characteristic to directly being detected reception due to receiver is caused to receive in signal containing beat frequency generation
Non-linear SSII distracters, also handled.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of system of DD-PON downlink processings, it is characterised in that including：
Transmitting terminal, power splitter and at least one receiving terminal, wherein, the power splitter be connected to the transmitting terminal with
Between each receiving terminal；
The transmitting terminal includes baseband signal emitter, semiconductor laser, optical modulator, image intensifer and the first single mode
Optical fiber, the baseband signal emitter, the semiconductor laser are connected with the optical modulator respectively, the optical modulator with
The image intensifer connection, the image intensifer is connected with first single-mode fiber；
Include second single-mode fiber, second single-mode fiber and the power beam splitting in each described receiving terminal respectively
Device is connected；
The optical modulator, for receiving the electric signal under the default modulation format that the baseband signal emitter is sent, and
The light carrier that the semiconductor laser is sent is received, and the electric signal under the default modulation format is modulated to light carrier
On, the optical signal after generation modulation；
The image intensifer, the optical signal after the modulation for receiving the optical modulator transmission, according to preset formula
Amplify the power of the optical signal after the modulation, the optical signal after generation power amplification；Wherein, preset formula is A=B+C-
D*E-F, A are the power of light carrier, and B is default power budget, and C is the sensitivity of receiving terminal, and D is transmission range, and E is optical fiber
Loss factor, F is device loss value；
The power splitter, for receiving the power amplification that the image intensifer is sent by first single-mode fiber
Optical signal afterwards, according to the optical signal after the power amplification, the optical signal after generation at least two-way power amplification, and for every
The optical signal after power amplification, one is sent to by the optical signal after power amplification all the way by second single-mode fiber all the way
The receiving terminal；
Each receiving terminal, for receiving the optical signal after the power amplification, according to the optical signal solution after the power amplification
Adjust downlink data.
2. system according to claim 1, it is characterised in that the receiving terminal, including：Photodetector and data signal
DSP unit is handled, wherein, the photodetector is connected with the DSP unit；
The photodetector, puts for receiving the power all the way that the power splitter is sent by second single-mode fiber
Optical signal after big, electric signal is converted to by the optical signal after power amplification all the way；
The DSP unit, for demodulating the downlink data according to the electric signal.
3. system according to claim 2, it is characterised in that the receiving terminal, in addition to：Low pass filter, wherein, institute
Low pass filter is stated to be connected between the photodetector and the DSP unit；
The low pass filter, gives birth to for receiving the electric signal that the photodetector is sent, and according to the electric signal
Into the electric signal after low-pass filtering treatment, the electric signal after the low-pass filtering treatment is sent to the DSP unit.
4. system according to claim 3, it is characterised in that the DSP unit, including：
Volterra wave filters balance module and orthogonal frequency division multiplex OFDM symbol de-maps module, the Volterra wave filters
Balance module is connected with OFDM symbol De-mapping module；
The Volterra wave filters balance module, for being carried out to the electric signal after the low-pass filtering treatment at damage equilibrium
Electric signal after reason, generation damage equilibrium treatment, and the electric signal after the damage equilibrium treatment is sent to the OFDM symbols
Number De-mapping module；
The OFDM symbol De-mapping module, for carrying out Digital Signal Processing to the electric signal after the damage equilibrium treatment,
Demodulate downlink data.
5. the system according to claim any one of 1-4, it is characterised in that the baseband signal emitter, specifically for：
Random generation serial signal；
Signal transacting is carried out to serial signal, to generate the electric signal under default modulation format.
6. a kind of method of DD-PON downlink processings, it is characterised in that including：
Optical modulator receives the electric signal under the default modulation format that baseband signal emitter is sent, and receives semiconductor laser
The light carrier that device is sent, and the electric signal under the default modulation format is modulated on light carrier, the light after generation modulation
Signal；
Image intensifer receives the optical signal after the modulation that the optical modulator is sent, and is adjusted according to preset formula amplification is described
The power of optical signal after system, the optical signal after generation power amplification；Wherein, preset formula is A=B+C-D*E-F, and A is light
The power of carrier wave, B is default power budget, and C is the sensitivity of receiving terminal, and D is transmission range, and E is optical fiber loss factor, F
For device loss value；
The light that power splitter receives after the power amplification that the image intensifer is sent by first single-mode fiber is believed
Number, according to the optical signal after the power amplification, the optical signal after generation at least two-way power amplification, and for per power all the way
Optical signal after amplification, a receiving terminal is sent to by the optical signal after power amplification all the way by the second single-mode fiber；
Each receiving terminal receives the optical signal after the power amplification, according to line number under the optical signal demodulation after the power amplification
According to.
7. method according to claim 6, it is characterised in that each receiving terminal receives the light letter after the power amplification
Number, according to the optical signal demodulation downlink data after the power amplification, including：
The photodetector being directed in each receiving terminal, receiving terminal receives the power splitter and passes through second single mode
Optical signal after the power amplification all the way that optical fiber is sent, electric signal is converted to by the optical signal after power amplification all the way；
The DSP unit being directed in each receiving terminal, receiving terminal demodulates the downlink data according to the electric signal.
8. method according to claim 7, it is characterised in that be directed to described in each receiving terminal, receiving terminal
DSP unit is demodulated according to the electric signal before the downlink data, in addition to：
The low pass filter being directed in each receiving terminal, receiving terminal receives the telecommunications that the photodetector is sent
Number, and the electric signal after low-pass filtering treatment is generated according to the electric signal, the electric signal after the low-pass filtering treatment is sent out
Give the DSP unit.
9. method according to claim 8, it is characterised in that the DSP being directed in each receiving terminal, receiving terminal
Unit demodulates the downlink data according to the electric signal, including：
The Volterra wave filters balance module for the DSP unit being directed in each receiving terminal, receiving terminal is to the low pass filtered
Electric signal after ripple processing carries out the electric signal after damage equilibrium treatment, generation damage equilibrium treatment, and the damage is balanced
Electric signal after processing is sent to the OFDM symbol De-mapping module of DSP unit；
At the OFDM symbol De-mapping module for the DSP unit being directed in each receiving terminal, receiving terminal is balanced to the damage
Electric signal after reason carries out Digital Signal Processing, demodulates downlink data.
10. the method according to claim any one of 6-9, it is characterised in that receive baseband signal in the optical modulator
Before electric signal under the default modulation format that emitter is sent, in addition to：
Baseband signal emitter generates serial signal at random, and carries out signal transacting to serial signal, to generate default modulation lattice
Electric signal under formula.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112699995A (en) * | 2020-12-24 | 2021-04-23 | 中国科学院半导体研究所 | Optical activation device based on semiconductor optical amplifier |
| CN114710208A (en) * | 2022-03-31 | 2022-07-05 | 中国人民解放军国防科技大学 | Digital signal distribution device and related assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6621625B1 (en) * | 2000-12-13 | 2003-09-16 | Avanex Corporation | Optical node including three-stage optical amplifier with automatic gain and level control |
| CN1992563A (en) * | 2005-12-20 | 2007-07-04 | 阿尔卡特朗讯公司 | System and method for automatic tuning of chromatic dispersion compensation for a WDM transmission system |
-
2017
- 2017-04-13 CN CN201710240778.3A patent/CN107094049A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6621625B1 (en) * | 2000-12-13 | 2003-09-16 | Avanex Corporation | Optical node including three-stage optical amplifier with automatic gain and level control |
| CN1992563A (en) * | 2005-12-20 | 2007-07-04 | 阿尔卡特朗讯公司 | System and method for automatic tuning of chromatic dispersion compensation for a WDM transmission system |
Non-Patent Citations (5)
| Title |
|---|
| CHANG KUO-CHUN等: ""Negative-Chirped EAM-SOA for Distance-Insensitive Optical OFDM Transmission in Long-Reach OFDMA PONs"", 《OPTICAL FIBER COMMUNICATION CONFERENCE (OFC), 2014》 * |
| CHENG JU等: ""SSBI Mitigation in A-RF-Tone-Based VSSB-OFDM System With a Frequency-Domain Volterra Series Equalizer"", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
| HSING-YU CHEN等: ""52.5% Data rate improvement by employing Volterra filtering and exponential companding in a high loss budget and high-capacity OFDM long-reach PON"", 《OFC 2016》 * |
| NAN LIU等: ""Experimental Demonstration of Sub-Line-Rate ONU Receiving Scheme in IMDD-OFDM-PON"", 《ACP 2014》 * |
| NUNO SEQUEIRA ANDRÉ等: ""33% Capacity improvement of a direct-modulation direct-detection OFDM link using adaptive Volterra equalization"", 《ECOC 2014》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112699995A (en) * | 2020-12-24 | 2021-04-23 | 中国科学院半导体研究所 | Optical activation device based on semiconductor optical amplifier |
| CN112699995B (en) * | 2020-12-24 | 2024-02-02 | 中国科学院半导体研究所 | Optical activating device based on semiconductor optical amplifier |
| CN114710208A (en) * | 2022-03-31 | 2022-07-05 | 中国人民解放军国防科技大学 | Digital signal distribution device and related assembly |
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Application publication date: 20170825 |