WO2008003215A1 - Procédé, système et dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (wdm-pon) - Google Patents

Procédé, système et dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (wdm-pon) Download PDF

Info

Publication number
WO2008003215A1
WO2008003215A1 PCT/CN2007/001688 CN2007001688W WO2008003215A1 WO 2008003215 A1 WO2008003215 A1 WO 2008003215A1 CN 2007001688 W CN2007001688 W CN 2007001688W WO 2008003215 A1 WO2008003215 A1 WO 2008003215A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
optical
broadcast
spectrum light
transmitted
Prior art date
Application number
PCT/CN2007/001688
Other languages
English (en)
Chinese (zh)
Inventor
Huafeng Lin
Wei Huang
Jun Zhao
Tao Jiang
Feng Wang
Jun Chen
Yuntao Wang
Guo Wei
Xuliang Zhang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008003215A1 publication Critical patent/WO2008003215A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0226—Fixed carrier allocation, e.g. according to service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures

Definitions

  • the present invention relates to the field of PON (passive optical network) technology, and in particular, to a method, system and device for implementing broadcast in a wavelength division multiplexing passive optical network. Background technique
  • high-quality video information services such as
  • VoD Video on Demand
  • ADSL Asymmetric Digital Subscriber Loop
  • CM Cycloned Modem
  • a PON usually includes an OLT (opital line terminal) 101, an ODN (optical distribution network) 102, and a plurality of ONUs 103 (optical network units) in a central office. Or ONT (Optical Network Termination).
  • OLT opital line terminal
  • ODN optical distribution network
  • ONUs 103 optical network units
  • ONT Optical Network Termination
  • the OLT provides an optical interface with the ODN and provides an interface on the network side to provide a cross-connection capability between the ODN side of the OLT and the network side of the OLT to complete bidirectional service transmission with the ONU.
  • the OLT can coexist with the local switch.
  • the ONU can also be installed at the remote end.
  • the ONU provides an optical interface with the ODN to implement the interface function on the ODN user side, and completes the two-way service transmission with the OLT. It can be placed at the user's location.
  • the ODN provides a transmission path for two-way service delivery between the OLT and the ONU.
  • WDM-PON is one of the implementation methods of PON.
  • the basic principle of WDM-PON is that different optical wavelength signals form different channels between OLT and ONU. In the downlink direction, these optical signals are multiplexed into one mixed signal and transmitted to the remote end. Node, demultiplexed into individual optical signals at the remote node And transmitting to different ONUs to complete the transmission of downlink data; in the uplink direction, the optical signals from the respective ONUs are multiplexed into a mixed signal on the remote node, and transmitted to the OLT, and the OLT completes the cancellation of the mixed signal. Use and data recovery to complete the transmission of uplink data.
  • WDM-PON is logically a peer-to-peer network structure.
  • WDM-PON is generally used for in-band multi-copy transmission of data. The defects are obvious: When many users order the same program, because the data is copied into many copies and transmitted to different users through different wavelengths, the OLT is required to have strong processing power, which will make the OLT become It is complicated and costs rise.
  • AWG ⁇ Arrayed Waveguide Grating, FSR Free Spectrum Range
  • This scheme first uses n fixed-wavelength lasers 20 to generate lasers having wavelengths of FSR+ ⁇ to FSR+ ⁇ , respectively, and then combines the above-mentioned n lasers into a hybrid unmodulated laser through coupler 21, and then uses an external modulator 22
  • the multicast data is once modulated into the above-mentioned lasers having wavelengths of FSR+ ⁇ to FSR+ ⁇ , and then the optical amplifier 23 is used to divide the n lasers carrying the multicast data into n parts by a brancher 24, and pass through
  • the combiner 25 mixes the optical signals carrying the downlink unicast data of the respective users into one signal, and inputs them to the respective inputs of the AWG of the NXN of the first stage.
  • each ONU After the wavelength routing of the first-stage AWG and the second-level AWG, each ONU finally receives the optical signal carrying the downlink unicast data of the ONU and the optical signal carrying the multicast data, and the coarse wave division inside the ONU is 26 PD (PhotoDiode) 27 and demodulation module 28, the final ONU 201 will recover the user's unicast data and multicast data, and forward it to the corresponding device for processing.
  • PD PhotoDiode
  • the third solution of the prior art adopts a separate broadcast wavelength for each user, and each ONU receives two wavelengths of optical signals, one carrying unicast data and the other carrying broadcast data, but this scheme is not utilized.
  • the periodic nature of the FSR of the AWG so the number of AWG ports at the remote node (RN, Remote Node) will be more, and the cost is very high due to the use of a fixed wavelength laser of almost twice the prior art scheme 2 described above. high.
  • a solution combining the foregoing technical solution 2 and the technical solution 3 is further combined, and the digital broadcast television signal is mixed with the downlink unicast data of the user, and transmitted in the optical signal of the unicast wavelength of the user.
  • the analog broadcast television signal is transmitted in a separate optical signal with a wavelength of ⁇ as in the prior art scheme 2 described above, and after photoelectric conversion, is transmitted to each user's home by a cable television network.
  • This scheme uses the mixed transmission of digital broadcast television signals and the user's downlink unicast data, which increases the system complexity of the OLT.
  • the transmission of digital broadcast television also has the problem of in-band multi-copy technology, and the processing capability of the OLT. It will become a bottleneck of the system.
  • the problems existing in the above prior art solution 2 cannot be solved in this solution.
  • Embodiments of the present invention provide a method and system for implementing broadcast in a wavelength division multiplexing passive optical network, so as to reduce networking complexity when implementing broadcast and/or multicast services in a WDM-PON.
  • Embodiments of the present invention also provide an optical line terminal to implement broadcast and/or in WDM-PON. Or multicast service.
  • a method for implementing broadcast in a WDM-PON comprising:
  • the multiplex demultiplexing device Transmitting, to the multiplex demultiplexing device, the wide spectrum light carrying the data required to be broadcastly transmitted; the multiplex demultiplexing device performing spectral line division on the wide spectrum light carrying the data required to be broadcast transmitted;
  • the multiplexing demultiplexing device transmits the split optical signals of different wavelengths to the optical network unit; the optical network unit performs photoelectric conversion on the received optical signal to demodulate the data.
  • the embodiment of the invention further provides a system for implementing broadcast in a WDM-PON, the system comprising:
  • An optical line terminal for modulating data to be broadcast in wide spectrum light for modulating data to be broadcast in wide spectrum light
  • a multiplexing demultiplexer configured to perform spectral line division on the wide-spectrum light carrying the data to be broadcasted, and transmit the split optical signals of different wavelengths to the optical network unit;
  • the optical network unit is configured to perform photoelectric conversion on the received optical signal to demodulate the data.
  • the embodiment of the invention further provides an optical line terminal, including:
  • An uplink processing module configured to demultiplex each uplink optical signal from the uplink signal, and recover uplink data from each uplink optical signal;
  • a downlink processing module configured to demultiplex data of each optical terminal unit from downlink data from a higher-level device, and modulate data of each optical terminal unit into optical signals of different wavelengths
  • a broadcast processing module for modulating data that needs to be broadcasted into wide spectrum light.
  • the FSR periodicity and the spectrum splitting characteristic of the multiplexing demultiplexing device are used to modulate the broadcast and/or multicast data or signals onto the wide spectrum light generated by the broad spectrum light source, and transmit the signal to the multiplexing demultiplexing device. And then dividing the broad spectrum light by using the spectrum splitting characteristic of the multiplexing demultiplexing device, and outputting optical signals of different wavelengths carrying broadcast and/or multicast data or signals respectively at each output end thereof, the technical solution Simplifies the WDM-PON network, reduces the requirements for OLT processing capability, reduces the complexity and cost of WDM-PON networking, and implements broadcast and/or multicast services in WDM-PON simply and cost-effectively. . DRAWINGS
  • Figure 1 is a network structure diagram of an existing PON system
  • FIG. 3 is a schematic diagram of the FSR periodic principle of the AWG
  • Figure 4 is a schematic diagram of AWG line segmentation
  • FIG. 5 is a schematic diagram of a light language of a broad spectrum light source 1 and a broad spectrum light source 2 according to an embodiment of the present invention
  • FIG. 6 is a block diagram of a WDM-PON system for implementing a broadcast service according to an embodiment of the present invention
  • FIG. 7 is a flowchart of implementing a broadcast service according to an embodiment of the present invention.
  • FIG. 8 is a block diagram of a WDM-PON system for implementing a multicast service according to an embodiment of the present invention.
  • the embodiment of the present invention transmits the data or signal that needs to be broadcasted and transmitted to the wide-spectrum light generated by the wide-spectrum light source, and then transmits the data to the multiplexing demultiplexing device, and then uses the multiplexing demultiplexing device.
  • the spectrum splitting feature divides the wide-spectrum light, and outputs optical signals of wavelengths (FSR+ ⁇ ) - (FSR+ ⁇ ) respectively carrying data or signals that need to be broadcasted and transmitted at respective output ends, optical network unit After receiving, O/E conversion is performed and demodulated.
  • the multiplex demultiplexing device in the embodiment of the present invention may be an AWG or a WGR (Wavelength Grating Router), and the AWG is taken as an example in the embodiment of the present invention.
  • the AWG has the FSR periodicity characteristic shown in Figure 3.
  • the first output outputs an optical signal of wavelength ⁇ ; according to the FSR periodicity of the AWG, when the optical signal of wavelength (nxFSR+ ⁇ ) is input to the input end of the AWG, it will also be the first in the AWG. Output on one output.
  • the optical signal of (nxFSR+ ⁇ ) will be output on the first output of the AWG. Therefore, in the embodiment of the present invention, the optical signal of the wavelength ⁇ carrying the broadcast signal and the optical signal of the wavelength FSR+ ⁇ carrying the unicast data are output at the first output end of the AWG, and the wavelength of the broadcast signal is carried. The optical signal of ⁇ and the optical signal of the wavelength FSR+ ⁇ carrying the unicast data are output at the nth output of the AWG.
  • the AWG also has a line segmentation function, as shown in Figure 4, where a represents an AWG in an ⁇
  • a represents an AWG in an ⁇
  • b represents the transmission spectrum of the AWG
  • the wide-spectrum light is split by the AWG, and the optical signal with the center wavelength of ⁇ 1 ⁇ is output on the N output ends of the AWG.
  • c and d represent the optical terms output on the first output and the third output, respectively.
  • the embodiment of the present invention utilizes the FSR periodicity and spectral line segmentation characteristics of the AWG described above, and the light source portion employs two low-cost broad-spectrum light sources, which are referred to as a wide-spectrum light source 1 and a broad-spectrum light source 2, respectively.
  • the optical maps of the broad spectrum light source 1 and the broad spectrum light source 2 satisfy the requirements shown in Fig. 5, that is, they must be separated by an integral multiple of the FSR.
  • the system of the embodiment of the present invention includes: an OLT 61, an AWG (referred to as a third AWG in the text for convenience of explanation) 62, and a plurality of ONUs 63.
  • the foregoing OLT 61 mainly includes: a broadcast processing module 611, a downlink processing module 612, an uplink processing module 613, a coupler 614, and a circulator 615.
  • the broadcast processing module 611 is configured to modulate the data or signal that needs to be broadcasted into the broadband demodulation device, and further includes the wide spectrum light source 2, the optical amplifier 4, and the modulator 3, and the wide spectrum light source. 2 for generating broad-spectrum light, the modulator 3 is for modulating a broadcast signal (analog or digital or a mixture of the two, hereinafter) into a wide-spectrum light, and the optical amplifier 4 is for amplifying the modulated wide-spectrum light Finally, the broad spectrum light carrying the broadcast signal is output to an input of the coupler 614.
  • the downlink processing module 612 is configured to demultiplex the data of each optical terminal unit from the downlink data from the upper-level device, and modulate the data of each optical terminal unit into the optical signals of different wavelengths, where the method further includes: The processing module 5, the broad spectrum source 1, the optical amplifier 6, the first AWG 7 and the modulator array 8 are exchanged.
  • the uplink processing module 613 further includes: a second AWG 9, a PD array 10, and a demodulator array 11.
  • the switching processing module 5 receives the IP packet data packet from the upper-level device, performs switching forwarding according to the destination address, and outputs downlink unicast data of each user on different ports;
  • the wide-spectrum light source 1 is used for Generating broad-spectrum light
  • the optical amplifier 6 is used for power amplification of the broad-spectrum light generated by the broad-spectrum light source 1;
  • the first AWG 7 receives the broad-spectrum light from the optical amplifier 6, and performs spectral line division of the broad-spectrum light, and the output wavelengths are respectively
  • the optical signal of ⁇ 1 ⁇ is used to modulate the downlink unicast data of each user into the optical signals of the above-mentioned wavelengths ⁇ 1 ⁇ respectively;
  • the modulator array 8 carries the downlink order of each user.
  • the optical signals of the broadcast data are output to respective inputs of the coupler 614.
  • the coupler 614 completes the wide-spectrum light carrying the broadcast signal and the downlink carrying the users.
  • the optical signals of the unicast data are combined into one mixed light, and the mixed light is output to the input terminal of the circulator 615.
  • the circulator 615 outputs the mixed light from the coupler 614 in the downward direction to the third AWG 62, and outputs the mixed light from the third AWG 62 in the upstream direction to the second AWG 9 of the upstream processing module 613.
  • the uplink processing module 613 is configured to demultiplex the uplink optical signals from the uplink signal and recover the uplink data from the respective uplink optical signals, and further includes a second AWG 9, a PD array 10, and a demodulator array 11.
  • the second AWG 9 is configured to receive the mixed light in the uplink direction from the circulator 615, and route the optical signals of different wavelengths of the uplink unicast data of each user in the mixed light to different output ends respectively; For performing photoelectric conversion on optical signals of different wavelengths; the demodulator array 11 is configured to perform demodulation on the electrical signals carrying the uplink unicast data of each user, and restore the uplink data.
  • the functions of the third AWG 62 in the uplink direction and the downlink direction are different, and are respectively described below:
  • Downstream direction After receiving the mixed light in the downlink direction from the circulator 615 of the OLT 61, the wide spectrum light carrying the broadcast signal is completed.
  • the line segmentation performs optical routing on the wavelengths of the ⁇ 1 ⁇ optical signals carrying the downlink unicast data of each user respectively; the result of the spectral line division is that the wavelengths carrying the broadcast signals are respectively outputted at the respective output ends of the third AWG 62.
  • the optical signals are respectively (FSR+l) ⁇ (FSR+?oi); and the result of the optical routing is that the wavelengths of the downlink unicast data carrying the users respectively output at the respective outputs of the third AWG 62 are ⁇ 1 ⁇ light, respectively. Signals; finally, at each output end of the third AWG 62, two optical signals respectively carrying the downlink unicast data and the broadcast signal are output, and the wavelength interval is FSR; finally, the third AWG 62 respectively outputs the optical signals on the respective outputs. Transfer to the corresponding individual ONUs 63;
  • the third AWG 62 receives, from each ONU 63, the wavelengths of the uplink unicast data carrying the users, respectively, the ⁇ 1 ⁇ optical signals, and then combines the optical signals of the wavelengths ⁇ 1 ⁇ into a mixed light in the upward direction. And transmitted to the circulator 615 of the OLT 61 described above.
  • the ONU mainly includes three parts: a coarse wavelength division 631, a ⁇ / ⁇ and a demodulation module 632, and a receiving and loopback modulation module 633, where:
  • the coarse wavelength division 631 is configured to separate the optical signal having the wavelength (FSR+ ⁇ ) optical signal carrying the broadcast signal and the wavelength ⁇ carrying the downlink unicast data of the ONU user, and output respectively To the O/E and demodulation module 632, the receive and loopback modulation module 633, on the other hand, the upstream light carrying the user's uplink unicast data from the receive and loopback modulation module 633 is transmitted to the third AWG 62.
  • the O/E and demodulation module 632 receives the optical signal having the wavelength (FSR + ⁇ ) carrying the broadcast signal, completes the photoelectric conversion and demodulation, and recovers the broadcast signal.
  • the receiving and loopback modulation module 633 performs the photoelectric conversion and demodulation function of the optical signal of the wavelength ⁇ carrying the downlink unicast data of the ONU user, recovers the downlink unicast data of the user, and sends the downlink unicast data to the next level. Equipment processing.
  • the receive and loopback modulation module 633 receives the user's uplink unicast data from the next level device and passes the RSOA (reflective semiconductor optical amplifier) or the injection lock FP LD (Fabriel-Perot (FP) - LD) laser) generates uplink light for carrying uplink unicast data, and modulates the user's uplink unicast data into the uplink light, and finally outputs the uplink light carrying the user's uplink unicast data to the coarse wavelength divider. 631.
  • RSOA reflective semiconductor optical amplifier
  • FP LD Fabriel-Perot (FP) - LD
  • the flow of the method for implementing broadcast in a WDM-PON according to the embodiment of the present invention is as shown in FIG. 7, and includes the following steps:
  • Step 701 Modulate data that needs to be broadcasted into the wide spectrum light; the data may be broadcast service data or multicast service data;
  • Step 702 Transmit the broad spectrum optical that carries the data to the multiplexing demultiplexing device.
  • Step 703 The multiplexing demultiplexing device performs spectral line segmentation on the broad spectrum light carrying the data.
  • the Wide-spectrum light is split into optical signals having wavelengths of (FSR+ 1) and (FSR+A2) (FSR+ ⁇ );
  • Step 704 Transmit the split optical signals of different wavelengths to the optical network unit.
  • the multiplexing demultiplexing device may output optical signals of respective wavelengths to different optical network units through different output ends of the multiplexing demultiplexing device;
  • Step 705 The optical network unit performs photoelectric conversion on the received optical signal to demodulate the data.
  • the system architecture shown in FIG. 6 is taken as an example to specifically describe the transmission process of the broadcast signal and the downlink data in the embodiment of the present invention, and the transmission process when the unicast data is uplinked.
  • the transmission process of the downlink broadcast signal includes:
  • the broad spectrum light source 2 produces broad spectrum light
  • the modulator 3 modulates the broadcast signal into the broad spectrum light
  • the optical amplifier 4 is amplified and input to an input end of the coupler 614;
  • the wide-spectrum light source 1 generates a wide-spectrum light (an integer multiple of the FSR from the wide-spectrum light source 2), and the generated broad-spectrum light is amplified by the optical amplifier 6 and input to the first AWG 7
  • the line division is performed, and the optical signals of wavelengths ⁇ 1 to ⁇ are respectively output after the line division, and the modulator array 8 modulates the downlink unicast data of each user into the optical signals of the above-mentioned wavelengths ⁇ 1 to ⁇ , respectively, and sends them into the coupling.
  • the coupler 614 combines the broad spectrum light carrying the broadcast signal with the optical signal carrying the downlink unicast data of each user into a mixed light, and outputs the mixed light to the input end of the circulator 615;
  • the circulator 615 outputs the mixed light from the coupler 614 in the downward direction to the third AWG 62;
  • the third AWG 62 performs the splitting of the wide-spectrum light carrying the broadcast signal, and outputs the optical signals carrying the broadcast signals respectively (FSR+ ⁇ ) ⁇ (FSR+ ⁇ ) on the respective output ends thereof;
  • the third AWG pair 62 carries the downlink unicast data of each user, and the wavelengths of the ⁇ 1 ⁇ optical signals respectively complete the optical routing, and the wavelengths of the downlink unicast data carrying the users respectively output on the respective output ends are respectively ⁇ 1 ⁇ ⁇ optical signal; finally, at each output end of the third AWG 62, two optical signals respectively carrying the downlink unicast data and the broadcast signal are output, and the wavelength interval is FSR; the third AWG 62 respectively transmits the optical signals on the respective output ends To the corresponding individual ONU63;
  • the coarse wavelength division 631 in the ONU 63 separates the optical signals carrying the broadcast signal optical signals and the downlink unicast data carrying the ONU users, and outputs them to the ⁇ / ⁇ and demodulation module 632, respectively, and the receive and loopback modulation. Module 633;
  • the ⁇ / ⁇ and demodulation module 632 in the ONU 63 completes the photoelectric conversion and demodulation to recover the broadcast signal; the receiving and loopback modulation module 633 carries the ONU user.
  • the optical signal of the downlink unicast data is photoelectrically converted and demodulated, and the downlink unicast data of the user is restored and sent to the next-level device for processing.
  • the transmission process when the unicast data is uplinked includes:
  • the receiving and loopback modulation module 633 of the ONU 63 receives the uplink unicast of the user from the next-level device, and then modulates the uplink unicast data of the user into the uplink optical, and finally outputs the uplink optical light carrying the uplink unicast data of the user.
  • the coarse wavelength divider 631 2.
  • the coarse wavelength division 631 transmits the uplink optical carrying the uplink unicast data to the third AWG 62, and the third AWG 62 receives, from each ONU, the wavelengths of the uplink unicast data carrying the users, respectively, ⁇ 1 ⁇ optical signals, and then Combining the wavelengths of ⁇ 1 ⁇ optical signals into a mixed light in the upward direction, and transmitting to the circulator 615 of the OLT 61;
  • the second AWG 9 of the OLT 61 receives the mixed light in the uplink direction from the circulator 615, and routes the optical signals of different wavelengths carrying the uplink unicast data of each user in the mixed light to different output ends respectively;
  • the optical signals of different wavelengths are photoelectrically converted and input to the demodulator array 11.
  • the demodulator array performs demodulation on the electrical signals carrying the uplink unicast data of each user, and restores the uplink unicast data.
  • the WDM-PON system in the embodiment of the present invention can also control the reception of the broadcast signal by the following methods, including the following steps:
  • the network administrator configures the privilege module according to the device ID of the ONU, and the privilege module is configured to store the rights of the ONU to receive broadcast or multicast, for example, including: device ID of the ONU, multicast receiving permission, and broadcast receiving permission;
  • the ONU sends a request message for receiving the broadcast to the OLT;
  • the OLT After receiving the request message for receiving the broadcast message from the ONU, the OLT extracts the device ID of the ONU in the request message, and performs the function verification by using the index to the permission module configured by the network administrator, and transmitting the corresponding result according to the right P ⁇ verification result. Broadcast control messages (prohibited or allowed) to the corresponding ONU;
  • the ONU After receiving the broadcast control message, the ONU performs corresponding action according to the content of the control message. If the ONU allows reception, the optical receiving and demodulating circuit of the broadcast signal is activated to receive the broadcast signal. Otherwise, the light receiving and decoding of the broadcast signal is turned off. Adjust the circuit.
  • the above WDM-PON system for transmitting broadcast service signals can also be used to transmit multicast service data, thereby solving the problem of using the in-band multi-copy technology to transmit multicast.
  • the OLT 81 includes a multicast processing module 811, a downlink processing module 612, an upstream processing module 613, a coupler 614, and a circulator 615.
  • the multicast processing module 811 has the same structure as the broadcast processing module 611, and includes: a wide spectrum light source 2, a modulator 3, and an optical amplifier 4. The difference between the transmission of the multicast signal by the system and the transmission of the broadcast signal by the system shown in FIG.
  • the exchange processing module 5 increases the extraction of the multicast data from the downlink data packet in addition to the exchange and forwarding of the downlink data.
  • the function of the switching processing module 5 extracts the multicast data from the downlink data packet, sends it to the modulator 3 of the multicast processing module 811 for modulation, and the modulator 3 modulates the multicast data to the wide spectrum generated by the broad spectrum light source 2.
  • the subsequent processing method is similar to the transmission broadcast, and will not be described again.
  • the OLT can also capture the request from the ONU to join the multicast group, and complete the multicast proxy function on the one hand, and determine the ONU according to the authentication result returned by the upper-layer multicast server on the other hand. Whether the OLT has permission to request the multicast group data, and sends a multicast service control packet to the ONU according to the judgment result, and the ONU filters out the multicast group that the OLT allows to receive according to the multicast service control packet from the OLT. Data, but directly discard multicast group data that is not allowed by the OLT. After the ONU decrypts the multicast group data allowed by the OLT, it will send it to the corresponding next-level device for further processing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé, un système et un dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (WDM-PON), ledit procédé comprenant: la donnée à transmettre par diffusion est modulée en une lumièreà large spectre; la lumière à large spectre transportant la donnée à transmettre par la diffusion est transmise vers un dispositif de multiplexage et démultiplexage; ledit dispositif de multiplexage et démultiplexage divise la lumière à large spectre transportant la donnée à transmettre; le dispositif de multiplexage et démultiplexage transmet le signal lumineux divisé avec des longueurs d'onde différentes vers des unités de réseau optique; ladite unité de réseau optique effectue une conversion optique-électrique (O/E) sur le signal lumineux reçu, et la démodulation de ladite donnée. L'invention résout le problème de déficit de l'art antérieur, simplifie la diffusion en WDM-PON, réduit la demande pour la capacité de traitement de terminal de ligne optique, réduit la complexité et le coût pour la mise en réseau de WDM-PON, et peut réaliser une diffusion et/ou un service de multidiffusion en WDM-PON.
PCT/CN2007/001688 2006-06-26 2007-05-24 Procédé, système et dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (wdm-pon) WO2008003215A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610061355.7 2006-06-26
CN 200610061355 CN101068129B (zh) 2006-06-26 2006-06-26 一种在wdm-pon中实现组播业务的方法、系统及olt

Publications (1)

Publication Number Publication Date
WO2008003215A1 true WO2008003215A1 (fr) 2008-01-10

Family

ID=38880577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/001688 WO2008003215A1 (fr) 2006-06-26 2007-05-24 Procédé, système et dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (wdm-pon)

Country Status (2)

Country Link
CN (1) CN101068129B (fr)
WO (1) WO2008003215A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101262299B (zh) * 2008-04-24 2012-04-25 上海交通大学 支持组播功能的波分复用无源光网络系统
US8238750B2 (en) * 2009-08-04 2012-08-07 Cisco Technology, Inc. Split/smart channel allocated WDM-PON architecture
CN101741468B (zh) * 2009-12-17 2013-02-06 上海交通大学 支持偏射路由组播功能的波分复用无源光网络系统
CN101714971B (zh) * 2009-12-22 2012-06-06 北京邮电大学 无源光网络通信方法及系统、光网络单元和光线路终端
CN102045126B (zh) * 2011-01-10 2015-06-03 中兴通讯股份有限公司 波分复用无源光网络系统及其使用方法
EP2940928B1 (fr) 2011-07-29 2016-11-09 Huawei Technologies Co., Ltd. Procédé dispositif et système de transfert de programme de multidiffusion
CN103109476B (zh) * 2012-10-26 2016-12-14 华为技术有限公司 无源光网络通信方法和系统、光线路终端
CN105515716B (zh) * 2015-12-28 2018-09-25 武汉邮电科学研究院 基于恒包络的ofdm信号单播和组播光网络结构
CN107959898A (zh) * 2017-12-05 2018-04-24 无锡路通视信网络股份有限公司 一种olt识别与其连接的onu合法性的方法
CN115150687A (zh) * 2021-03-31 2022-10-04 华为技术有限公司 光通信系统和光通信方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1496031A (zh) * 2002-09-23 2004-05-12 三星电子株式会社 用于接收广播/通信信号的光用户网络系统
US6775483B1 (en) * 1999-10-21 2004-08-10 Matsushita Electric Industrial Co., Ltd. System, device, and method for wavelength-division multiplex optical transmission
CN1652485A (zh) * 2004-02-03 2005-08-10 三星电子株式会社 使用ieee1394的用于广播/通信会聚的ftth系统
CN1909433A (zh) * 2006-08-10 2007-02-07 华为技术有限公司 一种复用解复用装置以及应用该装置的方法和系统

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5861965A (en) * 1996-08-30 1999-01-19 Lucent Technologies Inc. Optical communication system employing spectrally sliced optical source

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6775483B1 (en) * 1999-10-21 2004-08-10 Matsushita Electric Industrial Co., Ltd. System, device, and method for wavelength-division multiplex optical transmission
CN1496031A (zh) * 2002-09-23 2004-05-12 三星电子株式会社 用于接收广播/通信信号的光用户网络系统
CN1652485A (zh) * 2004-02-03 2005-08-10 三星电子株式会社 使用ieee1394的用于广播/通信会聚的ftth系统
CN1909433A (zh) * 2006-08-10 2007-02-07 华为技术有限公司 一种复用解复用装置以及应用该装置的方法和系统

Also Published As

Publication number Publication date
CN101068129A (zh) 2007-11-07
CN101068129B (zh) 2011-11-16

Similar Documents

Publication Publication Date Title
CN101009530B (zh) 支持组播类业务的无源光网络、复用/解复用器及方法
WO2008003215A1 (fr) Procédé, système et dispositif pour réaliser une diffusion en coupleur à multiplexage de longueurs d'onde-réseau optique passif (wdm-pon)
JP4676531B2 (ja) 光アクセスネットワークシステム
Park et al. Fiber-to-the-home services based on wavelength-division-multiplexing passive optical network
US8554078B2 (en) Passive optical network with plural optical line terminals
KR100606102B1 (ko) 방송/통신 통합형 수동 광네트웍 시스템
US20020196491A1 (en) Passive optical network employing coarse wavelength division multiplexing and related methods
CN101119163B (zh) 一种实现组播业务的wdm-pon方法、系统及光线路终端
WO2007071154A1 (fr) Reseau optique passif a multiplexage par repartition en longueur d'onde et son procede de mise en oeuvre
JP2007325279A (ja) 光ネットワークでトラフィックを分配する分配ノード及び方法
WO2007143945A1 (fr) Module de routage de longueur d'onde, et système et procédé associés
WO2008003246A1 (fr) Système de réseau optique passif et procédé de traitement de trajectoire optique correspondant
US20100021164A1 (en) Wdm pon rf/video broadcast overlay
Su et al. All‐optical virtual private network in passive optical networks
Zhou et al. Hybrid WDM-TDM PON architectures and DWBA algorithms
US7856182B2 (en) Optical CWDM-system
WO2010064999A1 (fr) Réseau optique passif multiplexé par répartition en longueur d'onde
Li et al. Dual-fiber-ring architecture supporting discretionary Peer-to-Peer intra-communication and bidirectional inter-communication in metro-access network
Iannone et al. Broadcast digital video delivered over WDM passive optical networks
Feng et al. A simple WDM-PON supporting LAN services by spectrum-sliced technology
CA2439876C (fr) Systeme optique a multiplexage par repartition approximative en longueur d'onde (cwdm)
Gutierrez et al. Next generation optical access networks
US7778549B1 (en) Unidirectional drop and continue using bidirectional transponder
Cincotti et al. Future passive optical networks: Can CDM beat WDM?
Koonen Optical network architectures

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07721261

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 07721261

Country of ref document: EP

Kind code of ref document: A1