CN101883296A - Wavelength division multiplexing passive optical network multicasting system based on code superposition - Google Patents
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Abstract
The invention relates to a wavelength division multiplexing passive optical network multicasting system based on code superposition, belonging to the technical field of optical communication. The multicasting system comprises an optical line terminal, a feed-in line optical fiber, a remote-end code, a plurality of downstream distributing optical fibers and a plurality of optical network units, wherein the optical line terminal comprises a unicasting data signal generator and a multicasting data signal generator; and each of the optical network units comprises an optical powder divider, a unicasting data receiver and a multicasting data receiver. In the invention, the unicasting data is a signal encoded on the basis of a non-return-to zero code mode, the multicasting data is a signal encoded on the basis of a Manchester code mode, and the two signals are both signals based on an amplitude encoding mode, thus the system has very easy detection, less external interference and high stability, saves cost, and improves precision; and because the multicasting data adopts the Manchester code mode, the invention reduces power fluctuation in transmission, avoids the generation of long zero and long one, has good synchronization function and strong anti-interference capacity, and is very easy to recover clock signals at a receiving end.
Description
Technical field
What the present invention relates to is the system in a kind of optical communication technique field, specifically is a kind of Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type.
Background technology
In recent years, along with the development of optical communication technique and the continuous increase of diverse network traffic carrying capacity, the user is more and more higher to the bandwidth demand of Access Network, Fiber to the home (Fiber To The Home, FTTH) be considered to one of best Access Network mode, and Wave division multiplexing passive optical network (wavelength-division-multiplexed passive optical network, WDM-PON) then be considered to the best solution of optical access network, it has higher bandwidth, good quality of service and be easy to plurality of advantages such as upgrading.Traditional Wave division multiplexing passive optical network passes through different wavelength at optical line terminal (Optical Line Terminal, OLT) and each optical network unit (Optical Network Unit, ONU) all set up a virtual point-to-point channel between, different users distinguishes with different wavelength, and is very easy when this channel is used for transmitting unicast data.Yet along with the growth of broadband business such as video request program, it is more and more important that multicast functionality becomes in Wave division multiplexing passive optical network, because the class of business that different user needs in the network is different.For example: the certain user needs professional A in same Wave division multiplexing passive optical network, and the other user does not need professional A, at this moment relevant with professional A multicast packet just must selectively send to those customized users of professional A, and do not send to other users, and in case user's system of preferring is arranged or cancel this business, network must send at once or cancel the transmission multicast packet relevant with professional A.This just requires Wave division multiplexing passive optical network to have multicast functionality, and flexible and changeable, is easy to control.Multicasting technology in the Wave division multiplexing passive optical network mainly is divided into two kinds at present: a kind of control technology that is based on sub-carrier modulation, another kind are based on yard Hybrid Modulation Technology of type stack.
Find through retrieval existing document, people such as Ning Deng have delivered the article that is entitled as " A WDM-PON Architecture withSelective-Broadcast Overlay (the Wave division multiplexing passive optical network structure of the professional stack of selective broadcast) " on " European Conference on OpticalCommunication; ECOC (ECOC Eeuropean Conference on Optical Communications) " in 2007, this technology mainly comprises: unicast data generator and multicast packet generation device, and some optical network units and upstream data emitting-receiving system.The unicast data generator can selectivity produce anti-NRZ or nonreturn to zero code, multicast packet generation device produces the differential phase keying (DPSK) sign indicating number, two kinds of signal generators link to each other, and these two kinds of sign indicating number types are superposeed, and can recover at optical network unit respectively through after the Optical Fiber Transmission.But this Technology Need adopts several switches in the unicast data generator, the modulation format of selecting unicast data is anti-NRZ or nonreturn to zero code, thereby realizes multicast functionality, and control method is cumbersome, and has improved cost.Multicast packet adopts the differential phase keying (DPSK) sign indicating number in addition, and the detection of this phase signal is subjected to environmental impact easily, needs the certain cost of cost, and system is also stable inadequately.
Find by retrieval again, people such as Yin Zhang were at " Photonic technology Letters in 2008, PTL (photon technology wall bulletin) " in delivered and be entitled as " A Multicast WDM-PON Architecture Using DPSK/NRZ OrthogonalModulation (a kind of multicast Wave division multiplexing passive optical network structure that adopts differential phase shift prosecution and nonreturn to zero code quadrature modulation) " literary composition, this technology has been done further improvement on the unicast data generator, saved switch, unicast data only adopts nonreturn to zero code, recently realize multicast by the delustring of adjusting nonreturn to zero code, but this technology still needs phase signal is detected, system is subjected to environmental impact easily, and is still stable inadequately.
Also find by retrieval, people such as Lei Cai on ECOC in 2008, delivered again " Cost-effective WDM-PON forSimultaneously Transmitting Unicast and Broadcast/multicast Data by superimposing IRZsignal onto NRZ signal (and a kind of employing is with the be added to method of nonreturn to zero code of anti-NRZ; thus realize transmitting simultaneously the low-cost Wave division multiplexing passive optical network of clean culture and broadcast/group broadcast data) " literary composition, the unicast data generator produces nonreturn to zero code in this technology, multicast packet generation device produces anti-NRZ, the two links to each other the sign indicating number type is superposeed, and in optical network unit, recover this two kinds of signals according to specific decoded mode, whole system adopts the adjustment delustring recently to realize multicast functionality.But the anti-NRZ in this technology is not a sign indicating number type commonly used in the communication, can't avoid long 0 and long by 1, is unfavorable for the recovery of clock, though provide cost savings, systematic function is not greatly improved.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type is provided.The present invention adopts the stack of nonreturn to zero code and Manchester code to realize the multicast of Wave division multiplexing passive optical network, can reduce cost, and can reduce the fluctuation of signal power in transmission course, and can avoid length 0 and long 1 sequence, is easy to clock recovery.
The present invention is achieved by the following technical solutions:
The present invention includes: optical line terminal, a feed-in linear light fibre, distant-end node, some descending profile fibers and some optical network units, wherein: optical line terminal links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet, the other end of feed-in linear light fibre links to each other with distant-end node and transmits the wavelength-division multiplex signals of unicast data and multicast packet, distant-end node links to each other with an end of descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, and the other end of descending profile fiber links to each other with optical network unit and transmits the demultiplexed signal of unicast data and multicast packet.
Described optical line terminal produces the wavelength-division multiplex signals of unicast data and multicast packet, comprise: uni-cast data signal generator and multicast packet signal generator, wherein: the uni-cast data signal generator transmission nonreturn to zero code unicast data multiplexed signals that links to each other with the input of multicast packet signal generator, the output of multicast packet signal generator link to each other with an end of feed-in linear light the fibre unicast data that transmits nonreturn to zero code and the wavelength-division multiplex signals of Manchester multicast packet.
Described uni-cast data signal generator produces the unicast data of nonreturn to zero code, comprise: some lasers, some nonreturn to zero code signal generators, the some intensity modulators and first array waveguide grating, wherein: laser links to each other with the optical input of intensity modulator and transmits light carrier, the nonreturn to zero code signal generator links to each other with the electric input port of intensity modulator and transmits the nonreturn to zero code signal of telecommunication, the output of intensity modulator links to each other with first array waveguide grating and transmits the nonreturn to zero code uni-cast data signal, and the first array moire links to each other with the multicast packet signal generator and transmits nonreturn to zero code unicast data multiplexed signals.
Described multicast packet signal generator produces the multicast packet of Manchester code, comprise: a Manchester code signal generator and an intensity modulator, wherein: the Manchester code signal generator links to each other with the electrical input of intensity modulator and transmits the multicast packet of Manchester code, and the output of intensity modulator links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet.
Described Manchester code signal generator produces Manchester coded signal, comprise: a nonreturn to zero code signal generator, a clock source and an electric XOR gate, wherein: an input of electric XOR gate links to each other with the nonreturn to zero code signal generator and transmits the multicast signal of nonreturn to zero code, the multicast packet signal that the electrical input of the intensity modulator in another input transmit clock signal that links to each other with the clock source of electricity XOR gate, the output of electric XOR gate and multicast packet signal generator links to each other and transmits Manchester code.
Described optical network unit is used to the unicast data and the multicast packet that recover original, comprise: an optical power divider, a unicast data receiver and a multicast packet receiver, wherein: the input of optical power divider links to each other with descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, an output of optical power divider links to each other with the unicast data receiver and transmits the demultiplexed signal of unicast data, link to each other with the multicast packet receiver demultiplexed signal of multicast data transmission of another output of optical power divider.
Described unicast data receiver is used for recovering unicast data, comprise: first photodetector and a nonreturn to zero code decoder, wherein: the input of first photodetector links to each other with an output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of first photodetector link to each other with the nonreturn to zero code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, non-return-to-zero decoder output unicast data.
The operation principle of described nonreturn to zero code decoder is: two parts before and after a code element is divided into, all to adjudicate in half code element of preceding half code element and back, and decision threshold is made as height, if twice judgement is 10,01 or 11, then final result is 1; If twice judgement is 00, then final result is 0.
Described multicast packet receiver is used for recovering multicast packet, comprise: second photodetector and Manchester code decoder, wherein: the input of second photodetector links to each other with another output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of second photodetector link to each other with Manchester code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, Manchester code decoder output multicast packet.
The operation principle of described Manchester code decoder is: two parts before and after a code element is divided into, all to adjudicate at preceding half-bit and back half-bit, and decision threshold is made as low, if twice judgement is 01, then final result is 0; If twice judgement is 10, then final result is 1; If judgement is other, then can decoding error.
The present invention can control the extinction ratio size of the uni-cast data signal of nonreturn to zero code by the bias voltage of regulating intensity modulator, and then whether the decoding of controlling last multicast signal is correct, thereby can determine this optical network unit can receive multicast signal, finally realize the multicast functionality of whole system.
Compared with prior art, the present invention has following advantage: unicast data is based on nonreturn to zero code mode encoded signals, multicast packet is based on Manchester coding mode encoded signals, and these two kinds of signals all are based on the signal of amplitude coding mode, the phase signal of comparing, be very easy to detect, be subjected to external interference very little, stability of a system height is not because need to carry out the detection of phase signal, provide cost savings, improved accuracy; Multicast packet adopts the Manchester's code mode, has reduced the power in the transmission and has floated, and the saltus step of level is all arranged in each code element, avoided long 0 and long 1 appearance, and having good synchronizing function, antijamming capability is strong, is highly susceptible at receiving terminal recovered clock signal.Whole system has preferable performance.
Description of drawings
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is the principle schematic of Manchester code coding;
The decoding principle schematic of nonreturn to zero code and Manchester code when Fig. 3 can recover for the embodiment multicast packet;
Fig. 4 is the decoding principle schematic of embodiment multicast packet nonreturn to zero code and Manchester code can not recover the time.
Embodiment
Below in conjunction with accompanying drawing system of the present invention is further described: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, present embodiment comprises: optical line terminal, a feed-in linear light fibre, distant-end node, some descending profile fibers and some optical network units, wherein: optical line terminal links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet, the other end of feed-in linear light fibre links to each other with distant-end node and transmits the wavelength-division multiplex signals of unicast data and multicast packet, distant-end node links to each other with an end of descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, and the other end of descending profile fiber links to each other with optical network unit and transmits the demultiplexed signal of unicast data and multicast packet.
Described optical line terminal produces the wavelength-division multiplex signals of unicast data and multicast packet, comprise: uni-cast data signal generator and multicast packet signal generator, wherein: the uni-cast data signal generator transmission nonreturn to zero code unicast data multiplexed signals that links to each other with the input of multicast packet signal generator, the output of multicast packet signal generator link to each other with an end of feed-in linear light the fibre unicast data that transmits nonreturn to zero code and the wavelength-division multiplex signals of Manchester multicast packet.
Described uni-cast data signal generator produces the unicast data of nonreturn to zero code, comprise: some lasers, some nonreturn to zero code signal generators, the some intensity modulators and first array waveguide grating, wherein: laser links to each other with the optical input of intensity modulator and transmits light carrier, the nonreturn to zero code signal generator links to each other with the electric input port of intensity modulator and transmits the nonreturn to zero code signal of telecommunication, the output of intensity modulator links to each other with first array waveguide grating and transmits the nonreturn to zero code uni-cast data signal, and the first array moire links to each other with the multicast packet signal generator and transmits nonreturn to zero code unicast data multiplexed signals.
Described laser is a single frequency laser.
Described multicast packet signal generator produces the multicast packet of Manchester code, comprise: a Manchester code signal generator and an intensity modulator, wherein: the Manchester code signal generator links to each other with the electrical input of intensity modulator and transmits the multicast packet of Manchester code, and the output of intensity modulator links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet.
Described Manchester code signal generator produces Manchester coded signal, comprise: a nonreturn to zero code signal generator, a clock source and an electric XOR gate, wherein: an input of electric XOR gate links to each other with the nonreturn to zero code signal generator and transmits the multicast signal of nonreturn to zero code, the multicast packet signal that the electrical input of the intensity modulator in another input transmit clock signal that links to each other with the clock source of electricity XOR gate, the output of electric XOR gate and multicast packet signal generator links to each other and transmits Manchester code.
As shown in Figure 2, described Manchester code is a kind of coding techniques commonly used in the communication, in this coded system, all there is the saltus step of a level centre of each code element, if the data that send are 0, then the signal behind the coding is to jump to high level from low level, promptly is encoded to 01; If the data that send are 1, then the signal behind the coding is to jump to low level from high level, promptly be encoded to 10, Manchester code can be undertaken obtaining after the XOR computing by nonreturn to zero code and clock signal, and this coded system has good synchronizing function and good antijamming capability.
Described distant-end node carries out demultiplexing to the wavelength-division multiplex signals of unicast data and multicast packet, comprise: second array waveguide grating, wherein: an end of second array waveguide grating transmits the wavelength-division multiplex signals of unicast data and multicast packet with fine linking to each other of feed-in linear light, and the other end of second array waveguide grating links to each other with descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet.
Described optical network unit is used to the unicast data and the multicast packet that recover original, comprise: an optical power divider, a unicast data receiver and a multicast packet receiver, wherein: the input of optical power divider links to each other with descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, an output of optical power divider links to each other with the unicast data receiver and transmits the demultiplexed signal of unicast data, link to each other with the multicast packet receiver demultiplexed signal of multicast data transmission of another output of optical power divider.
Described unicast data receiver is used for recovering unicast data, comprise: first photodetector and a nonreturn to zero code decoder, wherein: the input of first photodetector links to each other with an output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of first photodetector link to each other with the nonreturn to zero code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, non-return-to-zero decoder output unicast data.
The operation principle of described nonreturn to zero code decoder is: two parts before and after a code element is divided into, all to adjudicate in half code element of preceding half code element and back, and decision threshold is made as height, if twice judgement is 10,01 or 11, then final result is 1; If twice judgement is 00, then final result is 0.
Described multicast packet receiver is used for recovering multicast packet, comprise: second photodetector and Manchester code decoder, wherein: the input of second photodetector links to each other with another output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of second photodetector link to each other with Manchester code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, Manchester code decoder output multicast packet.
The operation principle of described Manchester code decoder is: two parts before and after a code element is divided into, all to adjudicate at preceding half-bit and back half-bit, and decision threshold is made as low, if twice judgement is 01, then final result is 0; If twice judgement is 10, then final result is 1; If judgement is other, then can decoding error.
When multicast packet can recover, as shown in Figure 3, wherein: a is the nonreturn to zero code of unicast data, the extinction ratio of the nonreturn to zero code of unicast data is low at this moment, then 0 yard power is half of 1 yard power, b is the multicast signal of Manchester code, and c is the superposed signal of unicast data nonreturn to zero code and multicast packet Manchester code.Nonreturn to zero code decoding principle to superposed signal is as follows: it is high selecting decision threshold, it is thresholding 1, be higher than this value and then be judged to 1, be lower than this value and then be judged to 0, two parts before and after simultaneously a code element being divided into, all adjudicate in half code element of preceding half code element and back, if twice judgement is 10,01 or 11, then final result is 1; If twice judgement is 00, then final result is 0, and the data after the judgement are consistent with nonreturn to zero code as can be seen; Manchester code decoding principle to superposed signal is as follows: it is low selecting decision threshold, it is thresholding 2, be higher than this value and then be judged to 1, be lower than this value and then be judged to 0, two parts before and after simultaneously a code element being divided into, all adjudicate in half code element of preceding half code element and back, court verdict is 01, and then final result is 0; If court verdict is 10, then final result is 1; If be other situations, think that then decoding produces mistake, the data after the judgement are consistent with Manchester code as can be seen.
When multicast packet can not recover, as shown in Figure 4, wherein: a is the nonreturn to zero code of unicast data, the extinction ratio of the nonreturn to zero code of unicast data is high at this moment, then 0 yard does not have luminous power, b is the multicast signal of Manchester code, and c is the superposed signal of unicast data nonreturn to zero code and multicast packet Manchester code.At this moment, by comparison diagram 3 and Fig. 4 as can be known, it is identical when decoding can recover with multicast packet with the Manchester code decoding rule when multicast packet can not recover to the nonreturn to zero code of superposed signal, but nonreturn to zero code can be deciphered out, and it is consistent with former nonreturn to zero code, but 00 situation can appear in the decoding of Manchester code, and this moment, decoding error illustrated that Manchester code can not translate.So just can whether can decipher correctly thereby control Manchester code, finally realize multicast functionality by changing the extinction ratio of nonreturn to zero code.
Course of work when present embodiment has only single wavelength is: the 1551.15nm single frequency laser produces the light carrier of 1551.15nm, be input to first Mach of moral intensity modulator once through first Polarization Controller, 1.25G/s the nonreturn to zero code signal generator produces the unicast data nonreturn to zero code signal of telecommunication of 1.25G, amplified by first electric amplifier, be input to first Mach of electric input port of moral intensity modulator once, 1.25G/s unicast data nonreturn to zero code light signal after first Mach of moral intensity modulator output is once modulated, be input to second Mach of moral intensity modulator once through second Polarization Controller, two inputs that the 1.25G/s multicast packet signal of telecommunication that while 1.25G/s nonreturn to zero code signal generator produces and 2.5G/s clock source signals are input to the electric XOR gate of high speed respectively, then electric XOR gate can produce the 1.25G/s Manchester code signal of telecommunication of the multicast packet behind the coding, this signal of telecommunication is input to second Mach of electric input port of moral intensity modulator once after being amplified by second electric amplifier, second Mach once the moral intensity modulator just the nonreturn to zero code light signal is modulated according to the signal of telecommunication of Manchester code, produce the superimposed light signal of the Manchester code of the nonreturn to zero code of unicast data and multicast packet.This superposed signal is amplified through EDFA ginseng bait image intensifer, through the logical optical filter elimination sideband noise of OBF band, is transferred to 12.5 kilometers SSMF standard single-mode fiber then.After the transmission through the SSMF standard single-mode fiber, superposed signal is input to and in optical power divider is divided into two identical parts at 1: 1, a part enters into the signal of telecommunication that first photodetector is converted into stack, recover the nonreturn to zero code signal through 1.25G/s nonreturn to zero code decoder then, be unicast data; Another part enters into the signal of telecommunication that also is converted into stack behind second photodetector, recovers Manchester coded signal through 1.25G/s Manchester code decoder then, is multicast packet.The decoding rule of nonreturn to zero code and Manchester code as mentioned before.When needs recover Manchester code, can regulate first Mach of bias voltage of moral intensity modulator once, produce the signal of telecommunication of the unicast data nonreturn to zero code of low extinction ratio, can recover Manchester coded signal of multicast packet according to decoding rule; When not needing to recover Manchester code be, then regulate first Mach of bias voltage of moral intensity modulator once, produce the signal of telecommunication of the unicast data nonreturn to zero code of High Extinction Ratio, according to decoding rule, this moment, the irrecoverable Manchester coded signal that goes out multicast packet was so just realized the control to multicast.
Single frequency laser has guaranteed the frequency unicity of light carrier in the present embodiment, unicast data only need with Mach once the moral intensity modulator carry out simple intensity modulated and get final product, saved the generation of high-power electric amplifier and subcarrier, the electric XOR gate that multicast packet is passed through at a high speed by simple nonreturn to zero code and clock source produces, at last also only through a simple Mach once the moral intensity modulator be added on the unicast data, simple in structure, bring the benefit of Manchester code simultaneously, and do not disturbed original signal.Modulating part in the whole system has only adopted Mach moral intensity modulator once, simplifies the structure, and only produces the signal based on the intensity coding mode, is very easy to detect, and is not easy to be subjected to external interference, has improved the stability of system, provides cost savings.Unicast data and multicast packet are synchronous strength signals, and transmit on the carrier wave of same frequency, have improved the utilance of frequency spectrum, have reduced the interference between different frequency.Multicast functionality is by different decoded modes, and the adjustment delustring realizes that recently method is simple.Nonreturn to zero code and Manchester code all are sign indicating number types commonly used in the communication system, are applied in engineering practice easilier.The decoded mode of two kinds of sign indicating number types has guaranteed that the data recovery has higher precision, and whole system has good performance.
Claims (6)
1. Wavelength division multiplexing passive optical network multicasting system based on sign indicating number type stack, comprise: optical line terminal, a feed-in linear light fibre, distant-end node, some descending profile fibers and some optical network units, wherein: optical line terminal links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet, the other end of feed-in linear light fibre links to each other with distant-end node and transmits the wavelength-division multiplex signals of unicast data and multicast packet, distant-end node links to each other with an end of descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, the other end of descending profile fiber links to each other with optical network unit and transmits the demultiplexed signal of unicast data and multicast packet, it is characterized in that
Described optical line terminal produces the wavelength-division multiplex signals of unicast data and multicast packet, comprise: uni-cast data signal generator and multicast packet signal generator, wherein: the uni-cast data signal generator transmission nonreturn to zero code unicast data multiplexed signals that links to each other with the input of multicast packet signal generator, the output of multicast packet signal generator link to each other with an end of feed-in linear light the fibre unicast data that transmits nonreturn to zero code and the wavelength-division multiplex signals of Manchester multicast packet;
Described optical network unit recovers original unicast data and multicast packet, comprise: an optical power divider, a unicast data receiver and a multicast packet receiver, wherein: the input of optical power divider links to each other with descending profile fiber and transmits the demultiplexed signal of unicast data and multicast packet, an output of optical power divider links to each other with the unicast data receiver and transmits the demultiplexed signal of unicast data, link to each other with the multicast packet receiver demultiplexed signal of multicast data transmission of another output of optical power divider.
2. the Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type according to claim 1, it is characterized in that, described uni-cast data signal generator produces the unicast data of nonreturn to zero code, comprise: some lasers, some nonreturn to zero code signal generators, the some intensity modulators and first array waveguide grating, wherein: laser links to each other with the optical input of intensity modulator and transmits light carrier, the nonreturn to zero code signal generator links to each other with the electric input port of intensity modulator and transmits the nonreturn to zero code signal of telecommunication, the output of intensity modulator links to each other with first array waveguide grating and transmits the nonreturn to zero code uni-cast data signal, and the first array moire links to each other with the multicast packet signal generator and transmits nonreturn to zero code unicast data multiplexed signals.
3. the Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type according to claim 1, it is characterized in that, described multicast packet signal generator produces the multicast packet of Manchester code, comprise: a Manchester code signal generator and an intensity modulator, wherein: the Manchester code signal generator links to each other with the electrical input of intensity modulator and transmits the multicast packet of Manchester code, and the output of intensity modulator links to each other with an end of feed-in linear light fibre and transmits the wavelength-division multiplex signals of unicast data and multicast packet.
4. the Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type according to claim 3, it is characterized in that, described Manchester code signal generator produces Manchester coded signal, comprise: a nonreturn to zero code signal generator, a clock source and an electric XOR gate, wherein: an input of electric XOR gate links to each other with the nonreturn to zero code signal generator and transmits the multicast signal of nonreturn to zero code, the multicast packet signal that the electrical input of the intensity modulator in another input transmit clock signal that links to each other with the clock source of electricity XOR gate, the output of electric XOR gate and multicast packet signal generator links to each other and transmits Manchester code.
5. the Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type according to claim 1, it is characterized in that, described unicast data receiver recovers unicast data, comprise: first photodetector and a nonreturn to zero code decoder, wherein: the input of first photodetector links to each other with an output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of first photodetector link to each other with the nonreturn to zero code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, non-return-to-zero decoder output unicast data.
6. the Wavelength division multiplexing passive optical network multicasting system based on the stack of sign indicating number type according to claim 1, it is characterized in that, described multicast packet receiver recovers multicast packet, comprise: second photodetector and Manchester code decoder, wherein: the input of second photodetector links to each other with another output of optical power divider and transmits the demultiplexed signal of unicast data and multicast packet, the output of second photodetector link to each other with Manchester code decoder transmission after the opto-electronic conversion unicast data and the signal of telecommunication of multicast packet, Manchester code decoder output multicast packet.
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| CN103226056A (en) * | 2012-01-31 | 2013-07-31 | 弗兰克公司 | Field tester for topologies utilizing array connectors and multi-wavelength field tester for topologies utilizing array connectors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168581A (en) * | 1996-03-28 | 1997-12-24 | 朗迅科技公司 | Method and apparatus for monitoring and correcting individual wavelength channel parameters in multi-channel wavelength division multiplexer system |
| CN1745530A (en) * | 2003-11-20 | 2006-03-08 | 日本电信电话株式会社 | Wavelength multiplex transmission system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168581A (en) * | 1996-03-28 | 1997-12-24 | 朗迅科技公司 | Method and apparatus for monitoring and correcting individual wavelength channel parameters in multi-channel wavelength division multiplexer system |
| CN1745530A (en) * | 2003-11-20 | 2006-03-08 | 日本电信电话株式会社 | Wavelength multiplex transmission system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226056A (en) * | 2012-01-31 | 2013-07-31 | 弗兰克公司 | Field tester for topologies utilizing array connectors and multi-wavelength field tester for topologies utilizing array connectors |
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