CN103152657B - Wave division multiplexing orthogonal frequency division multiplexing passive optical network (WDM-OFDM-PON) system based on shared transmitter energy-saving scheme - Google Patents
Wave division multiplexing orthogonal frequency division multiplexing passive optical network (WDM-OFDM-PON) system based on shared transmitter energy-saving scheme Download PDFInfo
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Abstract
The invention discloses a wave division multiplexing orthogonal frequency division multiplexing passive optical network (WDM-OFDM-PON) system based on a shared transmitter energy-saving scheme in the field of optical communication. The WDM-OFDM-PON system comprises a multi-longitudinal mode laser, a first circulator, a first WDM device, an optical switch, N first optical couplers, an OFDM transmitting device, a second WDM device, N PONs, a second circulator, a third WDM device and N first optical receiving devices, wherein the OFDM transmitting device comprises N first electro-optical modulation units which are used for modulating and amplifying an optical carrier and reflecting the optical carrier, and N digital signal processing units which are respectively connected with the corresponding first electro-optical modulation units and used for generating OFDM electric signals. According to the WDM-OFDM-PON system, a plurality of wavelength channels corresponding to a plurality of users share the same OFDM transmitting device to transmit downlink data, so an energy-saving effect is achieved.
Description
Technical field
What the present invention relates to is a kind of system of technical field of photo communication, specifically a kind of wavelength division multiplexing based on shared transmitter energy-saving scheme-OFDM-EPON (WDM-OFDM-PON) system.
Background technology
Information & Communication Technology (ICT) brings earth-shaking change to human society, but its energy of consumption and the greenhouse gas of release also get more and more.According to statistics, the energy that the various equipment needed for ICT and device consume has accounted for 8% of the consumption of global total energy.And along with the growth at full speed of user data bandwidth sum network user number in recent years, the energy that ICT consumes in a foreseeable future will with exponential increase, and this will make lack of energy, and ICT develops and also becomes unsustainable property.
In ICT field, Optical Access Network is owing to having a large amount of active devices, and the energy that it is consumed accounts for about 70% of whole communication network.Therefore, many scholars and researcher have invested energy the exploration of the energy-saving scheme of Access Network.Through full and accurate data statistic analysis, be published in IEEE Communication Magazines and be entitled as " Energy consumption inwired and wireless access networks " by the article pointed out that EPON (PON) structure is a kind of access network that power consumption is minimum, efficiency is the highest.At present, the energy-saving scheme that a large amount of documents and various standard all concentrate research to realize in these time division multiplexing EPONs of EPON and GPON laid (TDM PON), and also fewer to how realizing energy-conservation research in Wave division multiplexing passive optical network of future generation (WDMPON).WDM PON, as the preferred option of PON of future generation, has large bandwidth, easily upgrading and fail safe advantages of higher, and introduces OFDM technology wherein and greatly can improve the availability of frequency spectrum, just may commercialization in Future Ten to Two decades years.But WDM technology needs for the corresponding transceiver of each user installation, and OFDM technology needs to use high high-speed digital video camera (DSP) chip of power consumption, this all greatly can increase the power consumption in PON, and therefore the energy-saving scheme studied in WDM-OFDM-PON has very important meaning.
Through finding existing literature search, paper " A Cost-effective Pilot-Tone-based Monitoring Technique for Power Saving inRSOA-based WDM-PON (energy-saving scheme utilizing detection of pilot technology based in RSOA Wave division multiplexing passive optical network) " in international optical fiber communication meeting (Optical Fiber Communication Conference) 2011, proposes a kind of monitor signal utilizing RSOA to send in WDM PON to the energy saver mode of devices switch in control PON.The principle of the program is as follows: optical line terminal (OLT) is connected with distant-end node (RN) by a feeder fiber (feeder fiber), the array waveguide grating (AWG) at RN place is used for 16-32 the wavelength (de) multiplexing sent by optical line terminal, via profile fiber (distributed fiber), the signal that each wavelength carries is delivered to optical network unit end (ONU), in ONU end, the major part of downlink data is used for receiving, recover downlink data, another part enters reflection type semiconductor image intensifer (RSOA), be used for modulating and amplify upward signal, after circulator, upward signal is by original circuit back light line terminal, when from OLT to ONU
ioptical fiber link in do not have in a certain amount of time uplink and downlink data by time, optical line terminal and ONU end by the transceiver Close All of this wavelength channel corresponding, will enter sleep pattern, as certain ONU
kwhen needing to send data, it can modulate the clock signal that a frequency is a few megahertz on the RSOA of ONU end, the signal of this frequency will be carried in the amplification stimulated radiation noise (ASE) that such RSOA sends, at optical line terminal, the receiver of special monitoring ONU end signal will detect this clock signal in addition, thus determines ONU
ksend signal, just the transceiver of the optical line terminal of correspondence is opened, realize the downstream transmission of signal.This energy-saving scheme based on RSOA monitor signal can allow optical access network system enter sleep pattern when not having information to transmit, and waken up the transceiver of optical line terminal by the monitor signal that RSOA sends, realize energy saving to a certain degree, but still have following two shortcomings: the flow of (1) network happen suddenly often with to be interrupted, therefore the device of optical line terminal needs switch frequently, and this can damage performance and the life-span of optical line terminal transceiving device; (2) sleep pattern runs with the circulation pattern of a kind of " sleep-open-sleep ", even without transfer of data, it also needs periodic unlatching, described in document " EPON Powersaving via Sleep Mode ", the opening time of sleep pattern has accounted for 1/5 of total time, therefore can waste the energy of about 20%.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of WDM-OFDM-PON system based on shared transmitter energy-saving scheme is provided, utilize orthogonal frequency-division multiplex singal subcarrier dynamic assignment technology, achieve multiple wavelength channel (corresponding to multiple user) and share same orthogonal frequency-division multiplex singal emitter to launch downlink data, thus realize energy-conservation effect.
The present invention is achieved by the following technical solutions, the present invention includes: one produces the Multi-Longitudinal Mode laser of N number of different wave length light carrier, the first circulator, the first WDM device, one end has N number of input port and the other end has N
2the optical switch of individual output port, N number of one end have N number of input port and the other end has first optical coupler (OC) of 1 output port, OFDM (OFDM) emitter, the second WDM device, N number of optical network unit (ONU), the second circulator, the 3rd WDM device and N number of first optical pickup apparatus, wherein:
Multi-Longitudinal Mode laser produces the light carrier of N number of different wave length, first port of the first circulator is connected with the output of laser, the input of the first WDM device respectively with the second port, and N number of output port of the first WDM device is connected with N number of input port of optical switch the light carrier transmitting N number of different wave length respectively; The N of optical switch
2individual outlet is connected to transmit N number of different light carrier from N number of input port of N number of first optical coupler respectively; The output port of N number of first optical coupler is connected with the input port of orthogonal frequency division multiplex ransmitting injection device respectively;
Orthogonal frequency division multiplex ransmitting injection device comprises: N number of for modulating and amplifying light carrier and carried out the first electrooptic modulation unit, the respectively N number of digital signal processing unit for there is OFDM (OFDM) signal of telecommunication that be connected corresponding to each the first electrooptic modulation unit that reflect, wherein:
When user's downstream data rate sum that k (1≤k≤N) individual light carrier carries is less than the modulation rate of single first electrooptic modulation unit, k light carrier is made all to be input to same first electrooptic modulation unit by electric control optical switch, thus idle other k-1 the first electrooptic modulation unit and the individual corresponding digital signal processing unit of k-1; Digital signal processing unit produces one and comprises the OFDM signal of telecommunication of downlink data needed for k user and transfer to the first electrooptic modulation unit, downlink data wherein needed for different user occupies the subcarrier of the different number of this signal of telecommunication according to the difference of its speed, each downlink optical signal carries out amplifying and is reflected back the first circulator after being modulated to by this signal of telecommunication and k light carrier producing k downlink optical signal by the first electrooptic modulation unit;
First port of the second circulator is connected with the 3rd port of the first circulator, second port is connected with the input of the second WDM device, and the output of the second WDM device is connected from the first circulator, the N number of downlink optical signal transmitted so far carries out demultiplexing and transfers to each optical network unit respectively respectively by the profile fiber of correspondence with N number of optical network unit;
The input of the 3rd WDM device is connected with the 3rd port of the second circulator, output is connected with N number of first optical pickup apparatus respectively, and the 3rd WDM device is carried out demultiplexing after receiving the uplink optical signal sent from each optical network unit and transferred to each first optical pickup apparatus respectively and recover upstream data after receiving uplink optical signal by the first optical pickup apparatus.
Downlink data needed for described different user, the different number of sub carrier wave of this OFDM signal of telecommunication is occupied according to the difference of its speed, this is realized by digital signal processing unit, this unit comprises: the converting unit converting parallel data for downlink data needed for user from serial data to, for the parallel data of last cell translation being carried out the pattern map unit of quadrature amplitude modulation, for the data of last cells modulate being carried out the computing unit of inverse fast Fourier transform computing (IFFT), data for being produced by last unit are carried out inserting Cyclic Prefix (cyelic prefix) process and are formed the front end units of data flow and data flow carried out digital-to-analogue conversion and form OFDM (OFDM) signal of telecommunication by the signal generating unit of this electric signal transmission to the first electrooptic modulation unit.
Described quadrature amplitude modulation is a kind of modulation system of 16 kinds of symbols.
Described insertion Cyclic Prefix is placed on the head end of block signal after specifically end 20 code elements of each block signal of data being copied, and 276 code elements forming serial are the data flow of a block signal.
Interval between N number of wavelength of the light carrier that described Multi-Longitudinal Mode laser produces is consistent with the channel spacing of the first WDM device and the second WDM device.
The first described WDM device, the second WDM device and the 3rd WDM device are array waveguide grating (AWG).
Described optical network unit comprises: N number of have the second optical coupler of an input port and 2 output ports, for receive downlink optical signal and recover user's downlink data the second optical pickup apparatus, for modulating and amplifying light carrier and carried out the second electrooptic modulation unit of reflecting, wherein: the input port of each the second optical coupler is all connected with the second WDM device, the first output port is connected with each second optical pickup apparatus the downlink optical signal transmitted by the second WDM device demultiplexing respectively; Second output port of the second optical coupler is connected with the second electrooptic modulation unit, and transmit downlink optical signal as the light carrier loading upstream data, second electrooptic modulation unit upstream data is modulated light carrier and is amplified and the uplink optical signal of generation is reflected back the second optical coupler, and uplink optical signal is input to the 3rd WDM device via the 3rd port of the second optical coupler, the second WDM device and the second circulator.
The first described electrooptic modulation unit and the second electrooptic modulation unit for the signal of telecommunication is modulated to light carrier produces upstream or downstream light signal modulation function, be used for the optical amplification function that carried out by the upstream or downstream light signal of generation amplifying and be used for the reflection function that carried out by upstream or downstream light signal reflecting.
The input of the 3rd described WDM device is use feeder fiber to be connected with the 3rd port of the second circulator.
The present invention program's know-why is as follows: under general non-energy conservation model, the each light carrier exported from the first WDM device output port is connected by N number of first electrooptic modulation unit that optical switch is corresponding with it, N is natural constant, first electrooptic modulation unit loads the signal of telecommunication generated by digital signal processing unit, no matter the downstream rate size now on each wavelength channel, the relative N number of digital signal processing unit of N number of first electrooptic modulation unit all needs to open.
Under the energy conservation model that we propose, when the downstream rate on some wavelength channel is less, such as λ
i, λ
mand λ
ndownstream data rate sum on three wavelength channels is less than the most high modulation rate of single first electrooptic modulation unit, just by regulating optical switch, can make λ
i, λ
mand λ
nthree light carriers are input to a first electrooptic modulation unit i, modulation signal on the first electrooptic modulation unit, load channel i respectively on the subcarrier of the wherein signal of telecommunication, the user's downlink data on m and n.Digital signal processing unit m, n of other two first electrooptic modulation unit m, n and correspondence just can close like this, thus save the energy.In the process that passive access network is run, downstream signal speed on each wavelength channel can change along with the time, by dynamically regulating optical switch, the first electrooptic modulation unit of a part and relevant digital signal processing unit can be closed, thus save power consumption.
Beneficial effect
The present invention is according to the change of each channel downstream speed, dynamically regulate optical switch, make multiple wavelength channel can share single OFDM emitter, thus close remaining orthogonal frequency division multiplex ransmitting injection device, greatly reduce the power consumption of optical line terminal; At optical line terminal orthogonal frequency division multiplex ransmitting injection device place, utilize the subcarrier dynamic allocation method of orthogonal frequency-division multiplex singal, namely the downlink data of different user occupies the different subcarrier of this signal of telecommunication according to the difference of its speed, make the modulate downstream data of multiple channel in the same signal of telecommunication, can according to the speed of each downlink data, modulate the subcarrier of different number neatly, modulation /demodulation is all than being easier to convenient; At optical network unit end, a part for downlink optical signal is used as the light source of the second electrooptic modulation unit, not be used in optical network unit and installs special tunable laser, save the construction cost of EPON; In addition, the present embodiment utilizes the first electrooptic modulation unit as the transmitter of downlink optical signal at optical line terminal, has the function of amplifying simultaneously and modulating, simplifies the structure of optical line terminal.
Accompanying drawing explanation
Fig. 1 is embodiment 1 structural representation;
Fig. 2 is OFDM signal of telecommunication generating principle figure in embodiment 1;
Fig. 3 is embodiment 1 downlink optical signal transmission principle figure;
Fig. 4 is the spectrogram of the OFDM signal of telecommunication in embodiment 1;
Fig. 5 is that embodiment 1 obtains ber curve figure;
Fig. 6 is the energy-saving efficiency figure of embodiment 1.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment comprises: Multi-Longitudinal Mode laser 1, first circulator 2, first WDM device 3, one end of the light carrier of a N number of different wave length of generation has N number of input port and the other end has N
2the optical switch 4 of individual output port, N number of one end have N number of input port and the other end has the first optical coupler 5 of 1 output port, orthogonal frequency division multiplex ransmitting injection device, the second WDM device 6, N number of optical network unit 7, second circulator 8, the 3rd WDM device 9 and N number of first optical pickup apparatus 10, wherein:
Multi-Longitudinal Mode laser 1, first circulator 2, first WDM device 3, optical switch 4, first optical coupler 5, orthogonal frequency division multiplex ransmitting injection device, the second circulator 8, the 3rd WDM device 9 belong to optical line terminal;
The downlink optical signal being sent to optical network unit 7 from optical line terminal is produced the light carrier of N number of wavelength by Multi-Longitudinal Mode laser 1, first port of the first circulator 2 is connected with the output of Multi-Longitudinal Mode laser 1, the input of the first WDM device 3 respectively with the second port, and N number of output port of the first WDM device 3 is connected with N number of input port of optical switch 4 light carrier transmitting N number of different wave length respectively; The N of optical switch 4
2individual outlet is connected to transmit N number of different light carrier from N number of input port of N number of first optical coupler 5 respectively; The output port of N number of first optical coupler 5 is connected with the input port of orthogonal frequency division multiplex ransmitting injection device respectively;
Orthogonal frequency division multiplex ransmitting injection device comprises: N number of for modulating and amplifying light carrier and carried out the first electrooptic modulation unit 11, the respectively N number of digital signal processing unit 12 for there is the OFDM signal of telecommunication that be connected corresponding to each the first electrooptic modulation unit 11 that reflect, wherein:
When user's downstream data rate sum that k (1≤k≤N) individual light carrier carries is less than the modulation rate of single first electrooptic modulation unit 11, k light carrier is made all to be input to same first electrooptic modulation unit 11 by electric control optical switch 4, thus idle other k-1 the first electrooptic modulation unit 11 and the individual corresponding digital signal processing unit 12 of k-1; Digital signal processing unit 12 produces an OFDM signal of telecommunication and transfers to the first electrooptic modulation unit 11, wherein the downlink data of different user occupies the different number of sub carrier wave of this signal of telecommunication according to the difference of its speed, is carried out amplifying by each downlink optical signal and be reflected back the first circulator 2 after this signal of telecommunication is modulated to and k light carrier produces k downlink optical signal by the first electrooptic modulation unit 11;
When the downstream rate sum of k light carrier is greater than the modulation rate of single first electrooptic modulation unit 11, k light carrier is made all to be input to the first electrooptic modulation unit 11 of more than 2 or 2 by electric control optical switch 4;
First port of the second circulator 8 is connected with the 3rd port of the first circulator 2, second port is connected with the input of the second WDM device 6, and the output of the second WDM device 6 to be connected with N number of optical network unit 7 respectively by the profile fiber of correspondence and will to carry out demultiplexing from the first circulator 2 N number of downlink optical signal transmitted so far and transfer to each optical network unit 7 respectively;
The input of the 3rd WDM device 9 is connected with the 3rd port of the second circulator 8, output is connected with respectively N number of first optical pickup apparatus 10, and the 3rd WDM device 9 is carried out demultiplexing and also transferred to each first optical pickup apparatus 10 respectively and recover upstream data after receiving uplink optical signal by the first optical pickup apparatus 10 after receiving the upward signal sent from each optical network unit 7.
As shown in Figure 2, the downlink data of described different user, the different number of sub carrier wave of this signal of telecommunication is occupied according to the difference of its speed, this is realized by digital signal processing unit 12, this unit comprises: for user's downlink data to be converted to the converting unit of parallel data from serial data, for the parallel data of last cell translation being carried out the pattern map unit of quadrature amplitude modulation (QAM), for the data of last cells modulate being carried out the computing unit of inverse fast Fourier transform computing (IFFT), data for being produced by last unit are carried out inserting Cyclic Prefix (cyelic prefix) process and are formed the front end units of data flow and data flow carried out digital-to-analogue conversion and form OFDM (OFDM) signal of telecommunication by the signal generating unit of this electric signal transmission to the first electrooptic modulation unit 11.
Described quadrature amplitude modulation is a kind of modulation system of 16 kinds of symbols.
Described insertion Cyclic Prefix is placed on the head end of block signal after specifically end 20 code elements of each block signal of data being copied, and 276 code elements forming serial are the data flow of a block signal.
In the present embodiment, digital signal processing unit 12 employs the digital processing chip (DSP) based on inverse fast Fourier transform computing, and the binary data being used for serial being entered is converted into the signal of telecommunication to complete serial data conversion, pattern mapping, inverse fast Fourier transform computing (IFFT), to insert Cyclic Prefix (cyelic prefix) process; And use AWG (Arbitrary Waveform Generator) (AWG) to complete digital-to-analogue conversion.
Described optical network unit 7 comprises: N number of have the second optical coupler 13 of an input port and 2 output ports, for receive downlink optical signal and recover user's downlink data the second optical pickup apparatus 14, for modulating and amplifying light carrier and carried out the second electrooptic modulation unit 15 of reflecting, wherein: the input port of each the second optical coupler 13 is all connected with the second WDM device 6, the first output port is connected with each second optical pickup apparatus 14 downlink optical signal transmitted by the second WDM device 6 demultiplexing respectively; Second output port of the second optical coupler 13 is connected with the second electrooptic modulation unit 15, and transmit downlink optical signal as the light carrier loading upstream data, second electrooptic modulation unit 15 to be modulated light carrier with upstream data and is amplified and the uplink optical signal of generation is reflected back the second optical coupler 13, and uplink optical signal is input to the 3rd WDM device 9 via the 3rd port of the second optical coupler 13, second WDM device 6 and the second circulator 8.
The first described electrooptic modulation unit 11 and/or the second electrooptic modulation unit 15 for the signal of telecommunication is modulated to light carrier produces upstream or downstream light signal modulating device, be used for the optical amplification device that carried out by the upstream or downstream light signal of generation amplifying and be used for the reflection unit that carried out by upstream or downstream light signal reflecting.
In the present embodiment, the first described electrooptic modulation unit 11, second electrooptic modulation unit 15 uses reflective semiconductor optical amplifier (RSOA) to complete modulation, amplify process.
The first described optical pickup apparatus 10 and/or the second optical pickup apparatus 14 employ: for the photoelectric detector of upstream or downstream light signal that receives and the digital processing chip (DSP) recovering upstream or downstream data.
Interval between N number of wavelength of the Multi-Longitudinal Mode laser 1 (MML) that the present embodiment uses is consistent with the channel spacing of the first and second WDM device 6.
The first described WDM device 3, second WDM device 6 and the 3rd WDM device 9 are array waveguide grating (AWG), it is 1xN wave band multiplex/demultiplex device, mixed signal containing N number of wavelength is entered from array waveguide grating entrance, from N number of port signal that output wavelength is different respectively; Equally, if at N number of light signal corresponding to N number of port input wavelength, just N number of optical multiplexed signal can be used in an optical fiber at output port.
The input of the 3rd described WDM device 9 is use feeder fiber to be connected with the 3rd port of the second circulator 8, and the standard single-mode fiber of this feeder fiber to be a segment length be 20km in the present embodiment, its loss attenuation coefficient is 0.2dB/km.
In the present embodiment, optical switch 4 uses electric control mechanical light switch 4.
In the present embodiment, the standard single-mode fiber of profile fiber to be a segment length be 1-5km, its effect is to optical network unit 7 by the optical signal transmission of respective wavelength.
As shown in Figure 3, in the present embodiment, share an orthogonal frequency division multiplex ransmitting injection device as an example with three channel wavelengths, labor downlink optical signal generating principle.Last point at optical line terminal is digital signal processing unit 12, is used for producing the OFDM signal of telecommunication, and next part is that electrooptic modulation produces downlink optical signal.In last point, the downlink data in channel i, m and n is input to digital signal processing unit 12, generates the signal of telecommunication through process as shown in Figure 2.In next part, the wavelength launched by Multi-Longitudinal Mode laser 1 is respectively λ i, the light carrier of λ m and λ n is after a 3x1 optical coupler, enter the first electrooptic modulation unit 11, namely the reflective semiconductor optical amplifier of the present embodiment completes modulation, the amplification process of light signal, light signal, through the feeder fiber of 25km, arrives the array waveguide grating place of distant-end node.After array waveguide grating demultiplexing, three wavelength are transferred to respective optical network unit 7 by profile fiber respectively and carry out receiving demodulation, obtain respective downlink data.
As shown in Figure 4, (a) figure is under energy-saving scheme, during i, m and n tri-Channel Sharing first electrooptic modulation unit 11 downlink datas, and the electric spectrogram of the OFDM signal that digital signal processing unit 12 generates.The OFDM signal of telecommunication always has 256 subcarriers, the pattern form that each subcarrier is modulated is 16QAM, downlink data wherein on channel i and n respectively accounts for 32 subcarriers, and the downlink data on channel m accounts for 64 carrier waves, and remaining subcarrier does not carry any data.Can find out that channel i and n occupies the signal bandwidth of about 0.625GHz from figure (a), channel m occupies the signal bandwidth of about 1.25GHz.Figure (b), (c) and (d) are in a non-economized mode of operation, when channel i, m and n launch downlink data with the first electrooptic modulation unit 11i, the first electrooptic modulation unit 11m and the first electrooptic modulation unit 11n respectively, the spectrogram of the respective orthogonal frequency division multiplex OFDM signal of telecommunication.
As shown in Figure 5 be the ber curve figure that the present invention program obtains.Wherein scheme the error code curve that (a) is the downlink data obtained under energy-saving scheme, black curve is the error code curve recorded in back-to-back situation, at 10e
-3the error rate under, received power is about-19.6dBm, and red curve is the error code curve recorded in transmission 25km feeder fiber situation, at 10e
-3the error rate under, received power is about-18.8dBm.Figure (b) is the error code curve of the downlink data obtained in non-energy conservation model, and black curve is the error code curve recorded in back-to-back situation, at 10e
-3the error rate under, received power is about-19.9dBm, and red curve is the error code curve recorded in transmission 25km feeder fiber situation, at 10e
-3the error rate under, received power is about-19dBm.As can be seen from error code curve chart, the performance of energy-saving scheme on original wavelength division multiplexing-OFDM-EPON WDM-OFDM-PON scheme is only had an appointment the impact of 0.2-0.3dBm, smaller.
As shown in Figure 6 be the energy-saving efficiency schematic diagram of the present invention program.The longitudinal axis of schematic diagram represents the quantity of the required orthogonal frequency division multiplex ransmitting injection device opened of optical line terminal, and transverse axis represents 24 hours of one day.We know that the size of network traffics can change along with the change of time in one day, and in the time of 3:00 AM to 6, network traffics are minimum.Therefore, the quantity of the orthogonal frequency division multiplex ransmitting injection device now opened under energy-saving scheme is just minimum, is about 1/3.What in figure, black curve represented is required OFDM transmitter quantity of opening in common wavelength division multiplexing-OFDM-EPON WDM-OFDM-PON, and it is 32 (the total channel quantity of hypothesis WDM-PON WDM-PON is 32 here) always.What red curve represented is that under energy-saving scheme runs, the orthogonal frequency division multiplex ransmitting injection device quantity of unlatching over time.As can be seen from the figure, utilize energy-saving scheme of the present invention, the energy resource consumption of optical line terminal 33.6% can be reduced.
Embodiment 2
Other are arranged with reference to embodiment 1, but in the present embodiment, the first electrooptic modulation unit 11, second electrooptic modulation unit 15 uses Mach-Zehnder modulator (MZM) modulated light signal and erbium-doped fiber amplifier (EDFA) amplifying optical signals.
In the present embodiment, the first described optical pickup apparatus 10 and/or the second optical pickup apparatus 14 employ: optical receiver (Rx) array is used for receiving up, downstream signal, recovers up, downlink data.
Claims (8)
1. wavelength division multiplexing-OFDM-the passive optical network based on shared transmitter energy-saving scheme, it is characterized in that, comprising: Multi-Longitudinal Mode laser of light carrier producing N number of different wave length, the first circulator, the first WDM device, one end have N number of input port and the other end has N
2the optical switch of individual output port, N number of one end have N number of input port and the other end has the first optical coupler of 1 output port, orthogonal frequency division multiplex ransmitting injection device, the second WDM device, N number of optical network unit, the second circulator, the 3rd WDM device and N number of first optical pickup apparatus, wherein:
Downlink data produces the light carrier of N number of wavelength by Multi-Longitudinal Mode laser, first port of the first circulator is connected with the output of Multi-Longitudinal Mode laser, the input of the first WDM device respectively with the second port, and N number of output port of the first WDM device is connected with N number of input port of optical switch the light carrier transmitting N number of different wave length respectively; The N of optical switch
2individual outlet is connected to transmit N number of different light carrier from N number of input port of N number of first optical coupler respectively; The output port of N number of first optical coupler is connected with the input port of orthogonal frequency division multiplex ransmitting injection device respectively;
Orthogonal frequency division multiplex ransmitting injection device comprises: N number of for modulating and amplifying light carrier and carried out the first electrooptic modulation unit, the respectively N number of digital signal processing unit for there is the OFDM signal of telecommunication that be connected corresponding to each the first electrooptic modulation unit that reflect, wherein:
When the downstream data rate sum that k light carrier carries is less than the modulation rate of single first electrooptic modulation unit, 1≤k≤N, k light carrier is made all to be input to same first electrooptic modulation unit by electric control optical switch, thus idle other k-1 the first electrooptic modulation unit and the individual corresponding digital signal processing unit of k-1; Digital signal processing unit produces an OFDM signal of telecommunication and transfers to the first electrooptic modulation unit, wherein the downlink data of different user occupies the different number of sub carrier wave of this signal of telecommunication according to the difference of its speed, is carried out amplifying by each downlink optical signal and be reflected back the first circulator after this signal of telecommunication is modulated to and k light carrier produces k downlink optical signal by the first electrooptic modulation unit;
First port of the second circulator is connected with the 3rd port of the first circulator, second port is connected with the input of the second WDM device, and the output of the second WDM device is connected from the first circulator, the N number of downlink optical signal transmitted so far carries out demultiplexing and transfers to each optical network unit respectively respectively by the profile fiber of correspondence with N number of optical network unit;
The input of the 3rd WDM device is connected with the 3rd port of the second circulator, output is connected with N number of first optical pickup apparatus respectively, and the 3rd WDM device is carried out demultiplexing after receiving the uplink optical signal sent from each optical network unit and transferred to each first optical pickup apparatus respectively and recover upstream data after receiving uplink optical signal by the first optical pickup apparatus.
2. system according to claim 1, it is characterized in that, the downlink data of described different user, the different number of sub carrier wave of this signal of telecommunication is occupied according to the difference of its speed, this is realized by digital signal processing unit, this unit comprises: for user's downlink data to be converted to the converting unit of parallel data from serial data, for the parallel data of last cell translation being carried out the pattern map unit of quadrature amplitude modulation, for the data of last cells modulate being carried out the computing unit of inverse fast Fourier transform computing, data for being produced by last unit are carried out inserting circulation prefix processing and are formed the front end units of data flow and data flow carried out digital-to-analogue conversion and form the OFDM signal of telecommunication by the signal generating unit of this electric signal transmission to the first electrooptic modulation unit.
3. system according to claim 2, is characterized in that, described quadrature amplitude modulation is a kind of modulation system of 16 kinds of symbols.
4. system according to claim 2, is characterized in that, described insertion Cyclic Prefix is placed on the head end of block signal after specifically end 20 code elements of each block signal of data being copied, and 276 code elements forming serial are the data flow of a block signal.
5. system according to claim 1, is characterized in that, the interval between N number of wavelength of the light carrier that described Multi-Longitudinal Mode laser produces is consistent with the channel spacing of the first WDM device and the second WDM device.
6. system according to claim 1, is characterized in that, the first described WDM device, the second WDM device and the 3rd WDM device are array waveguide grating.
7. system according to claim 1, it is characterized in that, described optical network unit comprises: N number of the second optical coupler having an input port and 2 output ports, for receiving downlink optical signal and recovering the second optical pickup apparatus of user's downlink data, for modulating and amplifying light carrier and carried out the second electrooptic modulation unit of reflecting, wherein: the input port of each the second optical coupler is all connected with the second WDM device, first output port is connected with each second optical pickup apparatus the downlink optical signal transmitted by the second WDM device demultiplexing respectively, second output port of the second optical coupler is connected with the second electrooptic modulation unit, transmission downlink optical signal is as the light carrier loading upstream data, second electrooptic modulation unit upstream data is modulated light carrier and is amplified and the uplink optical signal of generation is reflected back the second optical coupler, and uplink optical signal is input to the 3rd WDM device via the 3rd port of the second optical coupler, the second WDM device and the second circulator.
8. system according to claim 1, is characterized in that, the input of the 3rd described WDM device is use feeder fiber to be connected with the 3rd port of the second circulator.
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| EP1887724A1 (en) * | 2005-12-22 | 2008-02-13 | Huawei Technologies Co., Ltd. | A wavelength division multiplexing passive optical network and its implement method |
| CN102724012A (en) * | 2012-06-19 | 2012-10-10 | 上海交通大学 | Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique |
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| EP1887724A1 (en) * | 2005-12-22 | 2008-02-13 | Huawei Technologies Co., Ltd. | A wavelength division multiplexing passive optical network and its implement method |
| CN102724012A (en) * | 2012-06-19 | 2012-10-10 | 上海交通大学 | Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique |
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