CN106301577B - Transmitter and receiver, transceiver and system for TWDM-PON - Google Patents
Transmitter and receiver, transceiver and system for TWDM-PON Download PDFInfo
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Abstract
The present invention provides a kind of systems for the transmitter of TWDM-PON, receiver, transceiver and RF video superposition TWDM-PON.The transmitter is used in the system of RF video superposition TWDM-PON, and the transmitter includes: MDB encoder, is configured as carrying out shaping to TWDM-PON signal, to reduce the PSD of the low frequency part of the TWDM-PON signal；Switch unit, it is configured as when in the system including RF vision signal, the MDB encoder is connected to carry out MDB coding to the TWDM-PON signal, and when not including RF vision signal in the system, the MDB encoder is disconnected so that the TWDM-PON signal bypasses the MDB encoder.
Description
Technical field
The present invention is generally related to passive optical network (PON), more specifically, is related to the transmitter for TWDM-PON
With receiver, the transceiver comprising such transmitter and receiver and the overlapping system comprising this transceiver.
Background technique
Recently, time-division wavelength division multiplexed optical network (Time and Wavelength Division Multiplexed
Passive Optical Network, TWDM-PON) by full service access network (Full Service Access
Network, FSAN) it is selected as the main bandwidth solution of next-generation passive optical network (NG-PON2), it is characterised in that it is logical
Cross the uplink aggregate capacity for combining multipair wavelength and downlink aggregate capacity and 10Gb/s at least 40Gb/s.In order to tradition
PON system is compatible, and the downlink and uplink wavelength of TWDM-PON system is respectively allocated at L+ frequency band (1596nm-1603nm wavelength)
In C- frequency band (1524nm-1544nm wavelength).As additional demand, TWDM-PON system is also needed with work in 1550nm
Conventional radio frequency (RF) video system and deposit.
It is non-linear between RF vision signal and TWDM-PON signal in the system of this RF video superposition TWDM-PON
Interaction can generate the influence that can not ignore to system.In the influence of all nonlinear fibers, the Raman scattering be excited
(stimulated Raman scattering, SRS) is a problem of most serious.In general, SRS gain is with wavelength interval
(wavelength spacing) is increased and is increased, and until wavelength interval about 110nm, this corresponds to maximum SRS efficiency.?
RF video is superimposed in the system of TWDM-PON, and the wavelength interval between RF vision signal and TWDM-PON signal is about 46-
53nm, this falls into SRS gain spectrum area.Therefore, SRS has dominated the nonlinear fiber damage in the system.Since SRS can make
Power is transferred to longer wavelength from shorter wavelength, therefore the performance of RF vision signal will greatly deteriorate, especially RF view
The low frequency component of the carrying analog video signal of frequency signal, due to very sensitive for distortion by more due to SRS's
Deteriorate.
The damage that some schemes to inhibit in the system that RF video is superimposed TWDM-PON Raman scattering currently has been proposed
Evil, including optical means and electronic method.
For optical means, a kind of typical scheme is using polarizing control.Since SRS is that high polarization relies on,
SRS gain can be minimized by making polarization and the TWDM-PON signal in orthogonal of RF vision signal, to greatly reduce
SRS crosstalk.However, for this scheme, in practice, since the polarization of RF vision signal changes at random along transmission link
Become, therefore is difficult that it is made to keep orthogonal relative to TWDM-PON signal always.Another typical optical plan is auxiliary transmission
Compensation scheme.The program is suggested by Huawei Company, which introduce the thermal compensation signal of Bandwidth-Constrained, i.e., the negative of all downlink signals
With.Pass through the modulation using each jamming transmitter and the phase between the complex modulated for applying on balanced device laser transmitter
Disappear interference, and harmful Raman crosstalk noise can be effectively eliminated in interested frequency and restores transmitted video information
Integrality.However, executing the benefit due to needing additional optical transmitter and wavelength channel for this scheme
It repays, therefore with high costs, it is difficult to receive.
For electronic method, a kind of typical scheme is to eliminate Raman by reducing the low frequency component of digital modulation signals
Crosstalk.Because of the power spectral density (power spectral density, PSD) of non-linear Raman crosstalk and digital modulation signals
It is strong correlation, and low frequency power is lower, Raman crosstalk will be lower.NEC Corporation suggested one in 2014 meeting of OFC
The method (referring to bibliography 1) that kind is filtered using RF, but Raman crosstalk may only be reduced about 5dB by this method.It is another
Kind method is Miller code (Miller coding) method that Huawei Company suggests in 2014 meeting of OFC, it is recommended that using
The Miller code (also referred to as delay modulation) of TWDM-PON signal reduces Raman crosstalk (referring to bibliography 2).This electronics
Coding method does not need additional optical module and is widely noticed.However, the bandwidth of Miller code consumption is traditional non-return to zero code
Twice of (Non Return Zero, NRZ) data, this makes optoelectronic device cost very high.In addition, according in bibliography 2
It is being reported as a result, Raman crosstalk can only at most be reduced about 10dB by Miller code, this is for inhibiting Raman crosstalk and increasing
It is inadequate for the transmission performance of strong RF vision signal.
Bibliography:
[1]Tanaka,et al.,“Beyond 5dB Nonlinear Raman Crosstalk Reduction via
PSD Control of 10Gb/s OOK in RF-Video Coexistence Scenarios for Next-
Generation PON”,OFC 2014,M31.3.
[2]Cheng Ning,et al.,“Delay modulation for TWDM-PON”,OFC 2014,W1D.3.
Summary of the invention
In view of the above problems, the main object of the present invention be to provide it is a kind of RF video superposition TWDM-PON system in subtract
The method of light Raman scattering.
According to an aspect of the invention, there is provided a kind of transmitter for TWDM-PON, the transmitter is used in RF
Video be superimposed TWDM-PON system in, the transmitter includes: MDB encoder, be configured as to TWDM-PON signal into
Row shaping, to reduce the PSD of the low frequency part of the TWDM-PON signal；Switch unit is configured as when in the system
When comprising RF vision signal, the MDB encoder is connected to carry out MDB coding to the TWDM-PON signal, and when described
When not including RF vision signal in system, the MDB encoder is disconnected so that the TWDM-PON signal is around MDB volume
Code device.
According to the second aspect of the invention, a kind of receiver for TWDM-PON is provided, the receiver is used in
RF video is superimposed in the system of TWDM-PON, and the receiver includes: MDB decoder, is configured as to received TWDM-
PON signal carries out shaping, to restore the PSD of the low frequency part of the TWDM-PON signal；CDR unit is configured as docking
The TWDM-PON signal of receipts executes clock and data recovery, to restore initial data；And switch unit, it is configured as working as institute
When stating in system comprising RF vision signal, the MDB decoder is connected to carry out MDB decoding to received TWDM-PON signal,
And when not including RF vision signal in the system, the CDR unit is connected so that the CDR unit is to received
TWDM-PON signal is restored, and bypasses the MDB decoder.
According to the third aspect of the present invention, provide it is a kind of comprising above-mentioned transmitter and receiver for TWDM-PON
Transceiver.
According to the fourth aspect of the present invention, the system of RF video superposition TWDM-PON a kind of is provided, comprising: RF video
Transceiver, for transmitting and receiving RF vision signal；One or more transceivers for being used for TWDM-PON as described above, each
Transceiver is for a wavelength in the TWDM-PON；And wavelength division multiplexer, for the RF video receiving machine will to be directed to
RF vision signal and be multiplexed and demultiplexed for the TWDM-PON signal of the transceiver for TWDM-PON.
Using the solution of the present invention, in the case where not improving the complexity of TWDM-PON system, RF view is significantly reduced
Raman crosstalk in the system of frequency superposition TWDM-PON, and save cost.
Detailed description of the invention
It, will be more preferable geographical after the description below with reference to a specific embodiment of the invention given by following drawings
The solution present invention, and other objects of the present invention, details, features and advantages will become apparent.In the accompanying drawings:
Fig. 1 shows duobinary system (the Modified Duo- comprising modification of embodiment according to the present invention
Binary, MDB) encoder the transmitter for TWDM-PON schematic diagram；
Fig. 2 shows the receivers for TWDM-PON comprising MDB decoder of embodiment according to the present invention
Schematic diagram；
Fig. 3 shows the schematic diagram of the structure of MDB encoder according to an embodiment of the present invention；
Fig. 4 shows the schematic diagram of the structure of MDB decoder according to an embodiment of the present invention；
Fig. 5 (a) -5 (c) respectively illustrates the TWDM-PON signal after original TWDM-PON signal, precoding and MDB coding
The schematic diagram of the waveform of TWDM-PON signal afterwards；
Fig. 6 shows the PSD's of MDB coding method according to the present invention and known nrz encoding and Miller code method
Compare figure；
Fig. 7 show comprising it is proposed that the RF video of the transceiver for TWDM-PON be superimposed TWDM-PON and be
The schematic diagram of the framework of system.
Specific embodiment
The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here
Formula is limited.On the contrary, these embodiments are provided so that this disclosure will be more thorough and complete, and can be by the disclosure
Range is fully disclosed to those skilled in the art.
The invention discloses a kind of to mitigate the novel side of Raman scattering crosstalk in the system of RF video superposition TWDM-PON
Method and device, basic thought are as follows: by TWDM-PON system introduce the new dual binary encoding method modified with
Shaping is carried out to the PSD of TWDM-PON signal, so that TWDM-PON signal is significantly reduced in the PSD of low frequency range, without changing
Become traditional RF video receiving machine.
Fig. 1 shows duobinary system (the Modified Duo- comprising modification of embodiment according to the present invention
Binary, MDB) encoder the transmitter 10 for TWDM-PON schematic diagram.
In the present invention, it is contemplated that the presence of RF vision signal can support conventional NRZ to modulate and proposed MDB
Modulate both modulation formats.Therefore commonly used in traditional transmitter and receiver front-end circuit of NRZ transceiver (as emitted
Laser driver (laser driver 140 as shown in Figure 1) and laser emitter (the laser hair as shown in Figure 1 of pusher side
Emitter 150), the trans-impedance amplifier (TIA, TIA 260 as shown in Figure 2) and limiting amplifier (LA, such as Fig. 2 of receiver side
Shown in LA 270)) also can be reused for MDB coding and decoding methods in the present invention.
It as shown in fig. 1, include MDB encoder 100 for the transmitter of TWDM-PON 10.MDB encoder 100 is configured
To carry out shaping to the TWDM-PON signal of input, to reduce the PSD of the low frequency part of TWDM-PON signal.
For the system of RF video superposition TWDM-PON, the TWDM-PON signal commonly entered is the data of NRZ modulation.
Transmitter 10 further includes switch unit, switch 110 and switch 120 as shown in Figure 1.The switch list of transmitter 10
Member is configured as when in the overlapping system including RF vision signal (such as when operator is other than sending TWDM-PON signal
Will also by the overlapping system send RF vision signal when), be connected MDB encoder 100 with the TWDM-PON signal to input into
Row coding.In addition, the switch unit of transmitter 10 is additionally configured to when not including RF vision signal in system, disconnects MDB and compile
Code device 100 is so that the TWDM-PON signal of input bypasses MDB encoder 100.
In Fig. 1, the switch unit of transmitter 10 be shown as include two 1x2 electronic switch, i.e., switch 110 and open
Close 120, however the present invention is not limited thereto, the switch unit in transmitter 10 may include other kinds of switch or its
The switch of his number.For example, switch unit can be only comprising one in switch 110 or switch 120.
In addition, transmitter 10 further includes coding controller 130, it is configured as according to whether sending RF video in systems
Signal and by coding selection control trigger signal switch unit.Specifically, if in system comprising RF vision signal (that is,
Need to send RF vision signal together with TWDM-PON signal in the overlapping system), then 130 control switch of coding controller
MDB encoder 100 is connected in unit.In this case, such as coding controller 130 can select control signal will by coding
The input port of switch 110 is connected with the output port for being connected to MDB encoder 100, is enable to the TWDM- to input
PON signal carries out MDB coding.
On the other hand, if not including RF vision signal (i.e., it is only necessary to send TWDM- in the overlapping system in system
PON signal is without sending RF vision signal), then coding controller 130 controls switch unit MDB encoder 100.?
In this case, for example, coding controller 130 can by coding select control signal by the input port of switch 110 with bypass
The output port of MDB encoder 100 is connected, so that not carrying out MDB coding to the TWDM-PON signal of input.In other words
It says, when not including RF vision signal in system, not to the TWDM-PON signal execution of input MDB coding of the present invention
Conventional nrz encoding is only executed to it.
Data after performing the coding of MDB coding or nrz encoding are input into laser driver 140 to drive laser
Transmitter 150 emits laser.
Fig. 3 shows the schematic diagram of the structure of MDB encoder 100 according to an embodiment of the present invention.
As shown in Figure 3, MDB encoder 100 includes precoding unit 101 and MDB coding unit 102.Precoding unit
101 are configured as executing difference precoding, MDB coding unit 102 to the TWDM-PON signal (such as original NRZ data) of input
It is configured as executing the TWDM-PON signal after precoding MDB coding to reduce the PSD of the low frequency part of TWDM-PON signal.
As being further shown specifically in Fig. 3, in one implementation, precoding unit 101 includes the first delay line
1011 and first logic gate 1012.TWDM-PON signal (Bn) after precoding is postponed a bit by the first delay line 1011,
After first logic gate 1012 is by original TWDM-PON signal (An) and by the precoding after the delay of the first delay line 1011
TWDM-PON signal (Bn after postponing) executes mould 2 plus operation (or XOR operation), to generate the TWDM- after precoding
PON signal.For example, it is assumed that TWDM-PON signal (initial data of the nrz encoding) An of input is " 0101101101001100 ",
Then generated difference precoded signal Bn is " 0110110110001000 ".Pay attention to, it is assumed here that the first bit of Bn is 0.
TWDM-PON signal Bn after precoding is introduced in MDB coding unit 102 and carries out MDB coding.Such as institute in Fig. 3
Show, MDB coding unit 102 includes the second delay line 1021 and the second logic gate 1022.Second delay line 1021 is used for will
Two bits of TWDM-PON signal delay after precoding, the second logic gate 1022 by the second delay line 1021 for that will be postponed
TWDM-PON signal afterwards and the TWDM-PON signal subtraction after precoding, to generate the TWDM-PON signal after MDB coding.Example
Such as, it is assumed that difference precoded signal Bn is " 0110110110001000 ", then the signal Cn after MDB coding is " 011-101-
101-1-1010-10”。
Fig. 5 (a) -5 (c) respectively illustrates the signal (Bn) after original TWDM-PON signal (An), precoding and MDB coding
The schematic diagram of the waveform of signal (Cn) afterwards.
For the TWDM-PON signal for using MDB according to the present invention to encode, receiver side can be held it
The corresponding decoding operate of row.
Fig. 2 shows the receivers 20 for TWDM-PON comprising MDB decoder of embodiment according to the present invention
Schematic diagram.
As shown in Figure 2, receiver 20 includes photoelectric detector 250, TIA 260 and LA270, for respectively to being received
To TWDM-PON signal pre-processed, such as Photoelectric Detection and amplification.Photoelectric detector 250, TIA 260 and LA 270 with
It is in the prior art same or like, therefore repeat no more.
Receiver 20 according to the present invention for TWDM-PON includes MDB decoder 200 and clock and data recovery
(clock and data recovery, CDR) unit 240.MDB decoder 200 executes and 100 phase of MDB encoder in Fig. 1
Anti- operation.Specifically, MDB decoder 200 is configured as carrying out shaping to received TWDM-PON signal, to restore
The PSD of the low frequency part of TWDM-PON signal.CDR unit 240 be configured as to received TWDM-PON signal execute clock and
Data are restored, to restore received initial data.
Receiver 20 further includes switch unit, switch 210 and switch 220 as shown in Figure 2.The switch list of receiver 20
Member is configured as when in the overlapping system including RF vision signal for example when operator is other than sending TWDM-PON signal
When also having sent RF vision signal by the overlapping system), be connected MDB decoder 200 with to received TWDM-PON signal into
Row decoding.In addition, the switch unit of receiver 20 is additionally configured to the conducting when not including RF vision signal in the overlapping system
The CDR unit 240 is so that restore received TWDM-PON signal by CDR unit 240, and bypass MDB decoder
200。
In Fig. 2, the switch unit of receiver 20 be shown as include two 1x2 electronic switch, i.e., switch 210 and open
Close 220, however the present invention is not limited thereto, the switch unit in receiver 20 may include other kinds of switch or its
The switch of his number.For example, switch unit can be only comprising one in switch 210 or switch 220.
In addition, receiver 20 further includes coding controller 230, it is configured as according to whether sending RF video in systems
Signal and trigger switch unit.Specifically, if comprising RF vision signal (that is, regarding RF in the overlapping system in system
Frequency signal is sent together with TWDM-PON signal), then MDB decoder 200 is connected in 230 control switch unit of coding controller.?
In this case, such as coding controller 230 can select control signal by the input port of switch 210 and connection by coding
Output port to MDB decoder 200 is connected, and is enable to carry out MDB decoding to received TWDM-PON signal.
On the other hand, if not including RF vision signal in system (that is, only having sent TWDM-PON in the overlapping system
Signal and not sent RF vision signal), then coding controller 230 controls switch unit MDB decoder 100 and CDR is connected
Unit 240.In this case, such as coding controller 230 can select control signal by the input of switch 210 by coding
Port is connected with the output port of conducting CDR unit 240, so that carrying out routine CDR behaviour to received TWDM-PON signal
Make and is decoded without MDB.In other words, when not including RF vision signal in system, not to received TWDM-PON signal
It executes MDB decoding of the present invention and only executes conventional NRZ decoding to it.
Fig. 4 shows the schematic diagram of the structure of MDB decoder 200 according to an embodiment of the present invention.
As shown in Figure 4, MDB decoder 200 includes differential decoding unit 201 and MDB decoding unit 202.Differential decoding
Unit 201 is configured as carrying out differential decoding to received TWDM-PON signal to restore the low frequency part of TWDM-PON signal
PSD, MDB decoding unit 202 is configured as executing the TWDM-PON signal after differential decoding MDB decoding.
As being further shown specifically in Fig. 4, in one implementation, differential decoding unit 201 includes the first delay line
2011 and first logic gate 2012.First delay line 2011 by received TWDM-PON signal (Cn) postpone two bits, first
After logic gate 2012 is by received TWDM-PON signal (Cn) and by the differential decoding after the delay of the first delay line 2011
TWDM-PON signal (Bn after postponing) executes mould 2 plus operation (or XOR operation), to generate the TWDM- of differential decoding
PON signal.For example, it is assumed that received TWDM-PON signal Cn is " 011-101-101-1-1010-10 ", then after differential decoding
TWDM-PON signal Bn is " 0110110110001000 ".Pay attention to, it is assumed here that the first bit of Bn is 0.
TWDM-PON signal Bn after differential decoding is introduced in MDB decoding unit 202 and carries out MDB decoding.Such as institute in Fig. 4
Show, MDB decoding unit 202 includes the second delay line 2021 and the second logic gate 2022.Second delay line 2021 is used for will
One bit of TWDM-PON signal delay after differential decoding, the second logic gate 2022 by the second delay line 2021 for that will be prolonged
TWDM-PON signal subtraction after the TWDM-PON signal and differential decoding that lag, to generate the decoded TWDM-PON letter of MDB
Number.
In addition, MDB decoder 200 further includes the unit 203 that takes absolute value, it is used for the decoded TWDM-PON letter of MDB
It number executes and to take absolute value operation.Here, level 1 and level -1 are both corresponded to binary one by the unit 203 that takes absolute value, and level 0
Corresponding to Binary Zero, to restore initial data An.
For example, it is assumed that signal Bn after differential decoding is " 0110110110001000 ", then the decoded signal of final MDB
(i.e. original TWDM-PON signal) An is " 0101101101001100 ".
Fig. 6 shows the PSD's of MDB coding method according to the present invention and known nrz encoding and Miller code method
Compare figure.
Since Raman crosstalk depends on power spectrum, especially low frequency component, so reducing the function of the frequency point in modulated signal
Rate will reduce the crosstalk levels at identical frequency.It is shown in Fig. 6 for the crosstalk NRZ data of 10Gb/s signal and proposed
MDB method between power spectral density compare.Obviously, proposed MDB coding method has TWDM-PON signal aobvious
Reduced power spectral density is write, especially in low frequency range.In the frequency of 50MHz, power is reduced about compared with NRZ data
25dB, this indicates that the Raman scattering crosstalk in RF vision signal can reduce 25dB, far superior to traditional scheme.Meanwhile it being built
MDB coding method in the TWDM-PON of the view bandwidth compared with known Miller code method is narrower, as shown in Figure 6.Therefore,
Which raises the robustness of dispersion and bandwidth demand is also reduced, to save cost.
Fig. 7 show comprising it is proposed that the transceiver (transmitter and receiver) for TWDM-PON RF video
It is superimposed the schematic diagram of the framework of the system of TWDM-PON.
As shown in Figure 7, for each wavelength channel (λ of TWDM-PON signal1,λ2,λ3,λ4...), using proposed
The optical transceiver of MDB coding method restrained effectively Raman crosstalk, while not needing RF video receiving machine and carrying out any change.
Encoded multi-wavelength TWDM-PON signal can be multiplexed by coexisting filter and RF vision signal, then be distributed to long-range light
Network unit (ONU).
Particular advantages of the invention include:
Shaping is carried out by PSD to TWDM-PON signal distribution, greatly reduces the Raman crosstalk of low frequency range, such as
About 25dB is significantly reduced in emulation, this ability considerably beyond conventional method (Miller code, RF filtering etc.)；
It suggested the new MDB coding method for executing PSD shaping；
Enable RF vision signal and TWDM-PON signal in same ODN network and deposits；
The robustness enhanced to dispersion is encoded by introducing MDB；
MDB coding methods different from the existing occupancy Miller code method of 2 times of Bit rate bandwidths, suggesting in the present invention
Bandwidth is narrower, therefore can reduce the optoelectronic device for transceiver to avoid broadband photoelectric equipment is used in a transceiver
Bandwidth requirement.
In one or more exemplary designs, this can be realized with hardware, software, firmware or their any combination
The application function.If realized with software, can be stored the function as one or more instruction or code
On a computer-readable medium, or as on computer-readable medium one or more instructions or code transmit.It calculates
Machine readable medium includes computer storage media and communication media, and wherein communication media includes facilitating computer program from one
Place is transmitted to the arbitrary medium of another place.Storage medium can be general or specialized computer-accessible any available
Medium.This computer-readable medium may include, such as, but not limited to, RAM, ROM, EEPROM, CD-ROM or other CDs
Store equipment, disk storage equipment or other magnetic storage apparatus, either can be used for general or specialized computer or it is general or
The form of the addressable instruction of application specific processor or data structure come code modules desired by carrying or store it is any its
Its medium.Also, it is any to connect the computer-readable medium that be known as.For example, if software be using coaxial cable,
The wireless technology of optical fiber cable, twisted pair, Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave etc is come from net
It stands, server or other remote sources transmission, then coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless
The wireless technology of electricity and microwave etc is also included in the definition of medium.
General processor, digital signal processor (DSP), specific integrated circuit (ASIC), field programmable gate can be used
Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or for executing sheet
Any combination of function described in text come realize or execute combine the disclosure described in various illustrative logical blocks, module and
Circuit.General processor can be microprocessor, alternatively, processor is also possible to any conventional processor, controller, micro-control
Device or state machine processed.Processor also can be implemented as calculating the combination of equipment, for example, the combination of DSP and microprocessor, multiple
The combination or any other such structure of microprocessor, one or more microprocessors and DSP core.
Those of ordinary skill in the art should also understand that, the various illustrative logics described in conjunction with embodiments herein
The combination of electronic hardware, computer software or both may be implemented into block, module, circuit and algorithm steps.In order to understand earth's surface
Show this interchangeability between hardware and software, various illustrative components, block, module, circuit and step are enclosed above
General description has been carried out around its function.Hardware is implemented as this function and is also implemented as software, is depended on specific
Using and apply design constraint over the whole system.Those skilled in the art can be directed to every kind of specific application, to become
Logical mode realizes described function, and still, this realization decision should not be interpreted as causing a departure from the scope of this disclosure.
The above description of the disclosure is for can be realized any those of ordinary skill of this field or using the present invention.It is right
For those of ordinary skill in the art, the various modifications of the disclosure be will be apparent from, and generality defined herein
Principle can also be applied to other deformations in the case where without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention is simultaneously
It is not limited to example and design as described herein, but it is consistent with the widest scope of principle disclosed herein and novel features.
Claims (14)
1. a kind of transmitter for time-division wavelength division multiplexed optical network TWDM-PON, the transmitter is superimposed used in radio frequency video
In the system of TWDM-PON, the transmitter includes:
The duobinary system MDB encoder of modification is configured as carrying out shaping to TWDM-PON signal, to reduce the TWDM-
The power spectral density PSD of the low frequency part of PON signal；
Switch unit is configured as that the MDB encoder is connected to described when in the system including RF vision signal
TWDM-PON signal carries out MDB coding, and when not including RF vision signal in the system, disconnects the MDB encoder
So that the TWDM-PON signal bypasses the MDB encoder.
2. transmitter as described in claim 1, wherein the TWDM-PON signal is the data of non-return-to-zero NRZ modulation.
3. transmitter as described in claim 1, wherein the MDB encoder further comprises:
Precoding unit is configured as executing difference precoding to the TWDM-PON signal；And
MDB coding unit is configured as executing the TWDM-PON signal after precoding MDB coding to reduce the TWDM-
The PSD of the low frequency part of PON signal.
4. transmitter as claimed in claim 3, wherein the precoding unit includes the first delay line and the first logic gate
Unit, first delay line are used for one bit of TWDM-PON signal delay after precoding, first logic gate
Unit is used to add the TWDM-PON signal with by the TWDM-PON signal execution mould 2 after first delay line delay,
To generate the TWDM-PON signal after the precoding.
5. transmitter as claimed in claim 3, wherein the MDB coding unit includes the second delay line and the second logic gate
Unit, second delay line are used for two bits of TWDM-PON signal delay after precoding, second logic gate
Unit is used for the TWDM-PON signal after being postponed by second delay line and the TWDM-PON signal subtraction after precoding,
To generate the TWDM-PON signal after MDB coding.
6. transmitter as described in claim 1, further includes:
Coding controller is configured as controlling described in the switching means conductive when in the system including RF vision signal
MDB encoder, and control the switch unit when not including RF vision signal in the system and disconnect the MDB coding
Device.
7. a kind of receiver for time-division wavelength division multiplexed optical network TWDM-PON, the receiver is superimposed used in RF video
In the system of TWDM-PON, the receiver includes:
The duobinary system MDB decoder of modification is configured as carrying out shaping to received TWDM-PON signal, described in restoring
The power spectral density PSD of the low frequency part of TWDM-PON signal；
Clock and data recovery CDR unit is configured as executing clock and data recovery to received TWDM-PON signal, with
Restore initial data；And
Switch unit is configured as that the MDB decoder is connected with right when in the system including radio frequency vision signal
Received TWDM-PON signal carries out MDB decoding, and when not including RF vision signal in the system, the CDR is connected
Unit is so that the CDR unit restores received TWDM-PON signal, and bypasses the MDB decoder.
8. receiver as claimed in claim 7, wherein the TWDM-PON signal is the data of non-return-to-zero NRZ modulation.
9. receiver as claimed in claim 7, wherein the MDB decoder further comprises:
Differential decoding unit is configured as executing differential decoding to the TWDM-PON signal；And
MDB decoding unit is configured as executing the TWDM-PON signal after differential decoding MDB decoding to restore described
The PSD of the low frequency part of TWDM-PON signal.
10. receiver as claimed in claim 9, wherein the differential decoding unit includes the first delay line and the first logic
Gate cell, first delay line are used for two bits of received TWDM-PON signal delay, the first logic gate list
Member is for believing received TWDM-PON signal with by the TWDM-PON after the differential decoding after first delay line delay
Number execute mould 2 plus, to generate the TWDM-PON signal after differential decoding.
11. receiver as claimed in claim 9, wherein the MDB decoding unit includes the second delay line and the second logic
Gate cell, second delay line are used for one bit of TWDM-PON signal delay after differential decoding, and described second patrols
Gate cell is collected to be used to be believed by the TWDM-PON after the TWDM-PON signal and differential decoding after second delay line delay
Number subtract each other, to generate the decoded TWDM-PON signal of MDB.
12. receiver as claimed in claim 7, further includes:
Coding controller is configured as controlling described in the switching means conductive when in the system including RF vision signal
MDB encoder, and when not including RF vision signal in the system control CDR unit described in the switching means conductive and
Disconnect the MDB decoder.
13. a kind of transceiver for time-division wavelength division multiplexed optical network TWDM-PON, the transceiver is folded used in radio frequency video
Add in the system of TWDM-PON, the transceiver includes such as transmitter of any of claims 1-6 and as right is wanted
Seek receiver described in any one of 7-12.
14. a kind of system of radio frequency video superposition time-division wavelength division multiplexed optical network TWDM-PON, comprising:
RF video receiving machine, for transmitting and receiving RF vision signal；
One or more transceivers for being used for TWDM-PON as claimed in claim 13, each transceiver are directed to the TWDM-
A wavelength in PON；And
Wavelength division multiplexer, for the RF vision signal for being directed to the RF video receiving machine to be used for TWDM-PON's with for described
The TWDM-PON signal of transceiver is multiplexed and is demultiplexed.
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| CN103634066A (en) * | 2012-08-28 | 2014-03-12 | 上海贝尔股份有限公司 | Optical line terminal and optical network unit |
| CN104378171A (en) * | 2013-08-14 | 2015-02-25 | 上海贝尔股份有限公司 | Optical line terminal, optical network unit and optical communication system |
| CN104426599A (en) * | 2013-09-06 | 2015-03-18 | 上海贝尔股份有限公司 | Communication system for time-division and wavelength-division multiplexing optical network |
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|---|---|---|---|---|
| CN103634066A (en) * | 2012-08-28 | 2014-03-12 | 上海贝尔股份有限公司 | Optical line terminal and optical network unit |
| CN104378171A (en) * | 2013-08-14 | 2015-02-25 | 上海贝尔股份有限公司 | Optical line terminal, optical network unit and optical communication system |
| CN104426599A (en) * | 2013-09-06 | 2015-03-18 | 上海贝尔股份有限公司 | Communication system for time-division and wavelength-division multiplexing optical network |
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