WO2012065460A1 - Procédé et système de réseau optique passif, terminal de ligne optique et unité de routage de longueur d'onde - Google Patents

Procédé et système de réseau optique passif, terminal de ligne optique et unité de routage de longueur d'onde Download PDF

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Publication number
WO2012065460A1
WO2012065460A1 PCT/CN2011/077919 CN2011077919W WO2012065460A1 WO 2012065460 A1 WO2012065460 A1 WO 2012065460A1 CN 2011077919 W CN2011077919 W CN 2011077919W WO 2012065460 A1 WO2012065460 A1 WO 2012065460A1
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WIPO (PCT)
Prior art keywords
wavelength
optical
wdm
optical signal
uplink
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PCT/CN2011/077919
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English (en)
Chinese (zh)
Inventor
苏婕
何子安
李长垒
黄新刚
李振刚
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中兴通讯股份有限公司
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Publication of WO2012065460A1 publication Critical patent/WO2012065460A1/fr

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Classifications

    • 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
    • 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
    • H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
    • H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
    • 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
    • H04J14/0245—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
    • H04J14/0247—Sharing one wavelength for at least a group of ONUs
    • 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
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0261—Optical medium access at the optical multiplex section layer
    • H04J14/0265—Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups
    • 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
    • H04J2014/0253—Allocation of downstream wavelengths for upstream transmission

Definitions

  • the present invention relates to the field of optical access network communications, and more particularly to optical line terminations and wavelength routing units in passive optical network systems, methods and systems. Background technique
  • Passive Optical Network is a mainstream technology for FTTX solutions (referred to as fiber-to-the-home, fiber-to-the-building, fiber-to-the-road, and other optical access technologies).
  • the current passive optical network is mainly based on Time Division Multiplexing-Passive Optical Network (TDM-PON).
  • TDM-PON uses a single wavelength for both uplink and downlink, and the utilization of wavelength bandwidth is very low. As people's demand for bandwidth continues to increase, this form of TDM-PON access network based on single wavelength will inevitably encounter bottlenecks.
  • Wavelength Division Multiplexing-Passive Optical Network is a new passive optical network system based on multi-wavelength single-fiber transmission.
  • the working principle is that each end user Separately occupy one wavelength channel, and multiple wavelength channels are transmitted in the same trunk fiber by wavelength division multiplexing. It is characterized by a wavelength bandwidth resource for each end user. This not only greatly increases the bandwidth provided to individual users, but also fully utilizes the wavelength bandwidth resources of the optical fiber, which greatly expands the total bandwidth of the passive optical network.
  • WDM-PON systems require multi-wavelength transmission for both uplink and downlink. Since the upstream signals are separated from each other by the physical wavelength, this completely eliminates the occurrence of the "rogue ONU" phenomenon.
  • Reflective Colorless ONU is mainly divided into two types of implementations: reflective semiconductor optical amplifier (RSOA) and injection-locked F-P laser.
  • RSOA reflective semiconductor optical amplifier
  • F-P laser injection-locked F-P laser
  • the common WDM-PON system uses multiple wavelengths of DFB lasers to achieve multi-wavelength downlink, and also uses the method of seed light injection into RSOA/FP-LD.
  • the current state of the art is concerned, no matter which scheme, for each downstream wavelength channel, It is necessary to have an independently modulated optical transmitter of different wavelengths, and when the number of users is required to be large, it is often necessary to use a dense wavelength division multiplexing optical device, and the cost is high. As a result, it has caused difficulties in the scale application and popularization of WDM-PON systems.
  • the traditional WDM-PON downlink uses multiple independent wavelength channels, which also enables the broadcast or multicast service to be copied to each wavelength channel, which increases the load of the central office data processing.
  • the invention provides a passive optical network system, wherein the downlink signal adopts a time division multiplexing mode, and the uplink signal uses a wavelength division multiplexing mode. Also provided are optical line terminations and wavelength routing units for use in the system. The purpose is to reduce the cost of the local device under the premise of preventing the rogue ONU and ensuring the high uplink and downlink bandwidth of the user, and the downlink and multicast services can be conveniently implemented by using the single-wavelength time division multiplexing signal in the downlink.
  • an optical line terminal including: a seed light source module, a light emitting module, a first wavelength division multiplexer (WDM), m optical receivers, a splitter, and an aura Row, m is a positive integer where:
  • the seed light source module is configured to output seed light including m wavelengths to the first WDM;
  • the light emitting module is configured to output a time-division multiplexed downlink optical signal of a single wavelength to the first WDM;
  • the first WDM is configured to: after combining the received seed light and the time division multiplexed downlink optical signal, input the first port of the optical circulator; the optical circulator is set to be the first The time division multiplexed downlink optical signal and the seed light input by one port are output through the second port;
  • the optical circulator is configured to: after receiving an uplink optical signal of m wavelengths from the second port, output to the splitter through a third port on the optical circulator;
  • the splitter is configured to: after performing wavelength demultiplexing on the uplink optical signal, respectively input optical signals of different wavelengths into the corresponding optical receivers.
  • the light emitting module is a high speed light emitting module, which is a high speed time division multiplexed downlink optical signal that is configured to output a single wavelength to the first WDM;
  • the splitter is an arrayed waveguide grating (AWG).
  • the present invention also provides another optical line terminal (OLT), comprising: a light emitting module, a first wavelength division multiplexer (WDM), a splitter, and m optical receivers, where m is a positive integer, where:
  • the optical transmitting module is configured to output a single wavelength time division multiplexed downlink optical signal to the first WDM, where the first WDM is configured to output the received time division multiplexed downlink optical signal;
  • the first WDM is configured to: after receiving the uplink optical signals of the m wavelengths, input to the splitter; the splitter is configured to perform wavelength demultiplexing on the uplink optical signals. , input the corresponding optical receiver separately.
  • the light emitting module is a high speed light emitting module, which is a high speed time division multiplexed downstream optical signal that is configured to output a single wavelength to the first WDM;
  • the splitter is an arrayed waveguide (AWG).
  • the present invention also provides another optical line terminal (OLT), comprising: a light emitting module, m optical receivers, a splitter, and an optical circulator, m being a positive integer, wherein:
  • the light emitting module is configured to output a time-division multiplexed downlink optical signal of a single wavelength to the circulator;
  • the optical circulator is configured to: receive the time-division multiplexed downlink optical signal from the first port, and then pass Second port output;
  • the optical circulator is configured to: after receiving the uplink optical signals of the m wavelengths from the second port, output to the splitter through the third port; the splitter is set to: After the uplink optical signal is wavelength-demultiplexed, optical signals of different wavelengths are respectively input to corresponding optical receivers.
  • the invention also provides a wavelength routing unit, comprising a second wavelength division multiplexer (WDM), a wavelength division multiplexing demultiplexer, a beam splitter and m third wavelength division multiplexers (WDMs), wherein m is positive Integer; where:
  • the second WDM is configured to: after receiving a time-multiplexed downlink optical signal of a single wavelength and seed light including m wavelengths, input the seed light including m wavelengths to the wavelength division And inputting, by the demultiplexer, the single wavelength time division multiplexed downlink optical signal to the optical splitter; the wavelength division multiplexing demultiplexer is configured to: input the seed light into the corresponding third WDM according to the wavelength, At the same time, the optical splitter splits the time-division multiplexed downlink optical signal and inputs m respectively.
  • the third WDM is configured to: combine the received time-division multiplexed downlink optical signal and the seed light of the corresponding wavelength to perform multiplexed output;
  • the m third WDMs are configured to: after receiving the uplink optical signals respectively, input the m optical wavelength uplink optical signals to the wavelength division multiplexing demultiplexer; the wavelength division multiplexing The demultiplexer is configured to combine the m wavelengths of the upstream optical signals and input the second WDMs; and the second WDM is configured to output the combined optical signals.
  • the wavelength division multiplexing demultiplexer is a dense wavelength multiplexing demultiplexer.
  • the second WDM, the wavelength division multiplexing demultiplexer, the optical splitter, and the m third WDMs in the wavelength routing unit are implemented by a single piece of planar lightwave circuit (PLC) chip.
  • PLC planar lightwave circuit
  • the present invention also provides another wavelength routing unit, including a second wavelength division multiplexer (WDM), a wavelength division multiplexing demultiplexer, a beam splitter, and m third wavelength division multiplexers (WDMs), where m is Positive integer; where:
  • the second WDM is configured to: after receiving the time-division multiplexed downlink optical signal of a single wavelength, input the time-multiplexed downlink optical signal of the single wavelength into the optical splitter; and the optical splitter pairs the time division Performing splitting with the downlink optical signal, respectively inputting m third WDMs; each third WDM is set to: outputting the received time-division multiplexed downlink optical signal;
  • the m third WDMs are configured to: after receiving the uplink optical signals of the m wavelengths, input the optical signals of the m wavelengths to the wavelength division multiplexing demultiplexer;
  • the wavelength division multiplexing demultiplexer is configured to combine the m optical wavelengths of the upstream optical signals into the second WDM, and the second WDM is configured to output the combined optical signals.
  • the wavelength division multiplexing demultiplexer is a dense wavelength multiplexing demultiplexer.
  • the second WDM, the wavelength division multiplexing demultiplexer, the optical splitter, and the m third WDMs in the wavelength routing unit are implemented by a single piece of planar lightwave circuit (PLC) chip.
  • PLC planar lightwave circuit
  • the present invention also provides a passive optical network system, wherein the downlink optical signal of the passive optical network system adopts a time division multiplexing manner, and the uplink signal uses a wavelength division multiplexing manner, and the passive optical network system includes: Optical line termination (OLT), optical distribution network (ODN), and m reflective optical network units (ONUs), m being a positive integer, wherein the OLT is an OLT as previously described.
  • OLT Optical line termination
  • ODN optical distribution network
  • ONUs m reflective optical network units
  • the ODN includes a trunk fiber, a wavelength routing unit, and m branch fibers;
  • the wavelength routing unit is configured to: after receiving the time-division multiplexed downlink optical signal of the single wavelength transmitted by the OLT output by the OLT and the seed light including m wavelengths, performing wavelength on the seed light After demultiplexing, m reflective ONUs are respectively input through the branch fiber according to the wavelength, and a time-division multiplexed downstream optical signal of a single wavelength is input to each reflective ONU through the branch fiber;
  • the wavelength routing unit is configured to: after receiving optical signals of m wavelengths reflected by the m reflective ONUs of the respective branch fibers, after wavelength multiplexing the optical signals, The trunk fiber is transmitted and input to the OLT.
  • the wavelength routing unit includes a second WDM, a wavelength division multiplexing demultiplexer, a splitter, and m third WDMs;
  • the second WDM is configured to: after receiving the single wavelength time division multiplexed downlink optical signal output by the OLT and the seed light including m wavelengths, input the seed light including m wavelengths to
  • the wavelength division multiplexing demultiplexer inputs the single wavelength time division multiplexed downlink optical signal into a beam splitter; the wavelength division multiplexing demultiplexer is configured to: input the seed light into wavelengths respectively
  • the third WDM at the same time, the optical splitter is configured to: split the time-division multiplexed downlink optical signal, and input m third WDMs respectively, and each third WDM is set to receive the received
  • the m third WDMs are configured to: after receiving the uplink optical signals reflected by the ONUs respectively, input the optical signals of the m wavelengths to the wavelength division multiplexing demultiplexer, where the waves
  • the sub multiplex demultiplexer is configured to combine the m optical wavelengths of the upstream optical signals into the second WDM, and the second WDM is configured to output the multiplexed optical signals to the trunk connected to the OLT. optical fiber.
  • the reflective ONU comprises a fourth WDM, a reflective semiconductor optical amplifier (RSOA) or an injection-locked FP laser (IL FP LD) and an optical receiver, wherein: the fourth WDM is set to: the incident seed The light and the time division multiplexed downlink optical signals are separated, and the time division multiplexed downstream optical signal is incident on the optical receiver, and the seed light is incident on the RSOA or the IL FP LD; the RSOA or IL FP LD is set to emit the same as the incident seed light. The wavelength is loaded with the upstream optical signal with data.
  • RSOA reflective semiconductor optical amplifier
  • IL FP LD injection-locked FP laser
  • the present invention further provides another passive optical network system, wherein the downlink optical signal of the passive optical network system adopts a time division multiplexing manner, and the uplink signal uses a wavelength division multiplexing manner, and the system includes: Optical line termination (OLT), optical distribution network (ODN), and m wavelength tunable optical network units (ONUs), wherein the OLT is an OLT as previously described.
  • OLT Optical line termination
  • ODN optical distribution network
  • ONUs wavelength tunable optical network units
  • the ODN includes a trunk fiber, a wavelength routing unit, and m branch fibers, and in a downlink direction, the wavelength routing unit is configured to: receive the high speed time division complex of the trunk fiber transmission output by the OLT After dividing the optical signal by using the downlink optical signal, respectively input m wavelength-adjustable ONUs;
  • the wavelength routing unit is configured to: after receiving the uplink optical signals sent by the m wavelength-adjustable ONUs, perform wavelength multiplexing on the uplink optical signals, transmit the optical signals through the trunk optical fiber, and input the The OLT.
  • the wavelength routing unit includes a second wavelength division multiplexer (WDM), a wavelength division multiplexing demultiplexer, a beam splitter, and m third wavelength division multiplexers (WDMs);
  • the second WDM is configured to: after receiving the time-multiplexed downlink optical signal of the single wavelength output by the OLT, input the time-division multiplexed downlink optical signal of the single wavelength into the optical splitter; And dividing the time division multiplexed downlink optical signal into m third WDMs; each third WDM is configured to: output the received time division multiplexed downlink optical signal to an ONU connected to each branch fiber ;
  • the m third WDMs are configured to: after receiving the uplink optical signals of the m wavelengths transmitted by the ONUs, respectively input the uplink optical signals of the m wavelengths to the wavelength division multiplexing demultiplexing
  • the wavelength division multiplexing demultiplexer is configured to combine the m optical wavelengths of the upstream optical signals into the second WDM, and the second WDM is configured to output the combined optical signals.
  • the ODN includes a trunk fiber, a beam splitter, and m branch fibers;
  • the optical splitter is configured to: after receiving the time-division multiplexed downlink optical signal of the single wavelength transmitted by the OLT output by the OLT, after splitting the optical signal, respectively input m wavelength-adjustable ONUs;
  • the optical splitter is configured to: receive the m pieces from each branch fiber After the optical signals of the m wavelengths emitted by the wavelength-adjustable ONU are combined, the optical signals are combined and transmitted to the OLT after being transmitted through the trunk optical fiber.
  • the wavelength tunable ONU includes a fourth WDM, a tunable laser (TLS), and an optical receiver, where the fourth WDM is configured to input an incident time division multiplexed downlink optical signal to the optical receiver.
  • the TLS is set to an upstream optical signal that emits a certain wavelength and is loaded with data.
  • the present invention further provides another passive optical network system, wherein the downlink optical signal of the passive optical network system adopts a time division multiplexing manner, and the uplink signal uses a wavelength division multiplexing manner, and the system includes: Optical line terminal (OLT), optical distribution network (ODN), and m+n optical network units (ONUs), wherein the ONU includes m reflective ONUs and n wavelength-adjustable ONUs, where:
  • the OLT includes: a seed light source module, a light emitting module, a first wavelength division multiplexer (WDM), an optical circulator, a splitter, and m+n optical receivers, where m and n are positive integers, where:
  • the seed light source module is configured to output seed light including m or m+n wavelengths to the first WDM, and the light emitting module is configured to output a single wavelength time division multiplexing to the first WDM.
  • a downlink optical signal where the first WDM is configured to combine the received seed light and the time division multiplexed downlink optical signal into a first port of the optical circulator; the optical circulator is configured to The time division multiplexed downlink optical signal and the seed light input from the first port are output through the second port; in the uplink direction, the optical circulator is configured to: receive m+n wavelengths from the second port After the upstream optical signal is output to the splitter through the third port, the splitter performs wavelength demultiplexing on the uplink optical signal, and then inputs optical signals of different wavelengths into corresponding optical receiving respectively. machine.
  • the ODN includes a trunk fiber, a wavelength routing unit, and an m+n branch fiber.
  • the wavelength routing unit is configured to: receive a single wavelength of the trunk fiber transmission output by the OLT.
  • the seed light is wavelength-demultiplexed
  • the optical signal input to each reflective ONU includes seed light of a corresponding wavelength and a time-division multiplexed downstream optical signal of a single wavelength.
  • the optical signal input by each wavelength-adjustable ONU includes a time-division multiplexed downstream optical signal of a single wavelength, or a seed light of a corresponding wavelength and a single wavelength Time division multiplexing the downstream optical signal;
  • the wavelength routing unit is configured to: after receiving the uplink optical signals transmitted by the m+n ONUs of the optical fibers of each branch, performing wavelength multiplexing on the optical signals, and transmitting the optical fibers through the trunk optical fiber. Then enter the OLT.
  • the wavelength routing unit includes a second wavelength division multiplexer (WDM), a wavelength division multiplexing demultiplexer, a beam splitter, and m+n third wavelength division multiplexers (WDMs);
  • WDM wavelength division multiplexer
  • WDMs wavelength division multiplexing demultiplexer
  • WDMs third wavelength division multiplexers
  • the second WDM is configured to: after receiving the high-speed time-division multiplexed downlink optical signal of the single wavelength output by the OLT and the seed light including m or m+n wavelengths, input the seed light to
  • the wavelength division multiplexing demultiplexer inputs the single wavelength time division multiplexed downlink optical signal into a beam splitter; the wavelength division multiplexing demultiplexer is configured to: input the seed light into wavelengths respectively
  • the third WDM wherein the optical splitter is configured to: split the time-division multiplexed downlink optical signal, and input m+n third WDMs respectively, and each third WDM is set to receive the received
  • the m+n third WDMs are set to: after receiving the uplink optical signals reflected by the ONUs respectively, input the m+n wavelengths of the uplink optical signals to the wavelength division multiplexing demultiplexer.
  • the wavelength division multiplexing demultiplexer is configured to combine the m+n wavelengths of the upstream optical signals into the second WDM, and the second WDM is configured to combine the combined optical signals. Output to the trunk fiber connected to the OLT.
  • the light emitting module is a high speed light emitting module, which is set to be the first
  • the WDM outputs a single wavelength high speed time division multiplexed downstream optical signal;
  • the demultiplexer is an arrayed waveguide grating (AWG).
  • the invention also provides a passive optical network transmission method, which is applied to a passive optical network system, and the method comprises: the downlink signal is transmitted in a time division multiplexing manner, and the uplink signal is transmitted in a wavelength division multiplexing manner.
  • the invention provides a time division wavelength division hybrid passive optical network system, which adopts a form of time division multiplexing instead of wavelength division multiplexing, by using an optical module (for example, 10 Gb/s or 40 Gb/s rate).
  • an optical module for example, 10 Gb/s or 40 Gb/s rate.
  • Replacing the optical module in the low-speed wavelength division multiplexing system can not only achieve the downlink bandwidth equivalent to the wavelength division multiplexing passive optical network, but also greatly reduce the cost.
  • the uplink and wavelength division multiplexing method completely eliminates the problem of "rogue ONU" in the ordinary time division multiplexing passive optical network.
  • the uplink signal retains the continuous mode, the transmission and reception techniques of the uplink signal are greatly reduced in difficulty, and the difficulty of upgrading the uplink signal rate in the future is also reduced.
  • FIG. 2 is a schematic diagram showing the internal structure of a wavelength routing unit according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a downlink time-division uplink wavelength division passive optical network system based on a wavelength-tunable colorless ONU according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic diagram of another downlink time-division uplink wavelength division passive optical network system based on a wavelength-tunable colorless ONU according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic diagram of a downlink time-division uplink wavelength division passive optical network system with a reflective colorless ONU and a wavelength-tunable colorless ONU according to Embodiment 4 of the present invention
  • FIG. 6a is a schematic diagram showing the internal structure of a seed light source module according to Embodiment 4 of the present invention
  • FIG. 6b is a schematic diagram showing the internal structure of another seed light source module according to Embodiment 4 of the present invention.
  • the downlink signal is time division multiplexed, and the uplink signal is multiplexed by wavelength division multiplexing.
  • OLT Optical Line Terminal
  • ODN Optical Distribution Network
  • m Reflective ONUs Optical Network Units
  • the OLT includes: a seed light source module, a light emitting module, a first wavelength division multiplexer (WDM), an optical circulator, a splitter (which may be an arrayed waveguide grating), and m optical receivers;
  • the seed light source module outputs seed light including m wavelengths to the first WDM
  • the light emitting module outputs a time-division multiplexed downlink optical signal of a single wavelength to the first WDM, where the first The WDM combines the received seed light and the time division multiplexed downlink optical signal into a first port of the optical circulator; the optical circulator input from the first port includes the time division Outputting the downlink optical signal and the seed light through the second port;
  • the optical circulator In the uplink direction, after the optical circulator receives the multi-wavelength upstream optical signal input by the ODN from the second port, the optical circulator outputs to the splitter through a third port on the optical circulator, the After performing wavelength demultiplexing on the uplink optical signal, the wave device respectively inputs optical signals of different wavelengths into corresponding optical receivers;
  • the optical transmitting module, the splitter and the m optical receivers in the OLT can be integrated into one optical transceiver module.
  • the above-mentioned splitter may be a heat-sensitive splitter or a heat-independent splitter.
  • the ODN includes a trunk fiber, a wavelength routing unit, and a plurality of branch fibers
  • the wavelength routing unit receives the time-multiplexed downlink optical signal of the single wavelength and the seed light of the m wavelengths transmitted by the trunk optical fiber output by the OLT, after performing wavelength demultiplexing on the seed light,
  • m reflective ONUs are respectively input through the branch fiber, and a time-multiplexed downstream optical signal of a single wavelength is input to each reflective ONU through the branch fiber, that is, the light input to each reflective ONU includes the corresponding wavelength.
  • the wavelength routing unit In the uplink direction, after receiving the optical signals of m wavelengths reflected by the n reflective ONUs of the respective branch fibers, the wavelength routing unit performs wavelength multiplexing on the optical signals, and then passes through the trunk fiber.
  • the OLT is input after transmission.
  • the seed light source may be a multi-wavelength light source or a broad spectrum light source.
  • the wavelength routing unit comprises a second WDM, a wavelength division multiplexing demultiplexer (which may be a dense wavelength multiplexing demultiplexer), a beam splitter, and m third WDMs;
  • the second WDM receives the time-division multiplexed downlink optical signal output by the OLT and the seed light including m wavelengths
  • the seed light including the n wavelengths is received.
  • the wavelength division multiplexing demultiplexer Inputting to the wavelength division multiplexing demultiplexer, inputting the single wavelength time division multiplexed downlink optical signal into a beam splitter; the wavelength division multiplexing demultiplexer respectively inputting the seed light into a corresponding wavelength third
  • the optical splitter splits the time-division multiplexed downlink optical signal into m third WDMs, and each of the third WDM pairs receives the time-division multiplexed downlink optical signal and the corresponding wavelength of the seed light. After merging, output to the ONU connected to it;
  • the m third WDMs respectively receive the uplink optical signals reflected by the ONU, input the uplink optical signals of the n wavelengths to the wavelength division multiplexing demultiplexer, where the wavelength division is repeated.
  • the m optical signals of the m wavelengths are combined by the demultiplexer and then input to the second WDM, and the second WDM outputs the combined optical signals to the trunk optical fiber connected to the OLT.
  • the above wavelength division multiplexing demultiplexer may be a thermally independent arrayed waveguide grating (AAWG) or a thin film filter (TFF).
  • AAWG thermally independent arrayed waveguide grating
  • TDF thin film filter
  • the second WDM, the wavelength division multiplexing demultiplexer, the optical splitter, and the m third WDMs included in the above wavelength routing unit can be implemented by a single piece of planar lightwave circuit (PLC) chip.
  • PLC planar lightwave circuit
  • the reflective ONU includes a fourth WDM, a reflective semiconductor optical amplifier (RSOA) or an injection-locked F-P LD (IL F-P LD), and an optical receiver.
  • the fourth WDM is configured to separate the incident seed light and the time division multiplexed downlink optical signal, and the time division multiplexed downlink optical signal is incident on the optical receiver, and the seed light is incident on the RSOA or the IL FP LD, the RSOA or the IL FP LD.
  • an upstream optical signal having the same wavelength as the incident seed light and loaded with data is emitted.
  • FIG. 1 is a schematic diagram of a downlink time division and uplink wavelength division passive optical network system based on Embodiment 1 above.
  • the OLT side multi-wavelength light emitted from the light source Seeds ⁇ ⁇ 2, ... ⁇ ⁇ , the wavelength of the light emitted by the transmitter is ⁇ .
  • the time division multiplexed downlink signal is incident on the 1 port of the optical circulator through the wavelength division multiplexer WDM multiplexer, and is output from the 2 port of the optical circulator to the trunk fiber.
  • the multi-wavelength upstream optical signal loaded with the modulated signal reflected from the ONU side is incident on the optical port of the optical circulator through the trunk fiber, and then exits from the 3 port to the AWG for wavelength demultiplexing, and then is incident on the receiver array Rx 1- Rx m.
  • the downlink multi-wavelength seed light is respectively transmitted to different branch fibers according to the wavelengths and transmitted to different ONUs according to the wavelengths; the time division multiplexed downlink signals are equally divided by the wavelength routing unit.
  • the uplink multi-wavelength signals of different wavelengths sent from the respective ONUs are incident on the wavelength routing unit through each branch fiber, and then are combined to the trunk fiber and then transmitted upstream.
  • FIG. 2 is a schematic diagram showing the internal structure of the wavelength routing unit in the first embodiment.
  • the down-light and seed light are incident from the common port of the wavelength routing unit.
  • the multi-wavelength seed light is incident on the wavelength division multiplexing demultiplexer (AAWG or TFF).
  • the AAWG or TFF divides the multi-wavelength seed light into different branch fibers according to the wavelength; the downlink time-division multiplexed optical signal passes through the WDM, is incident on a common port of a splitter (Splitter), and the splitter splits the time-division multiplexed optical signal.
  • the optical fibers are equally divided into the respective branch fibers, and each of the descending lights of the seed light and the work after each wavelength are combined by the corresponding WDM device and then incident on the corresponding branch fibers.
  • the upstream optical signal loaded with data reflected from the ONU from each branch fiber is combined by AAWG or TFF, and then transmitted to the trunk fiber through the WDM device for transmission.
  • the downlink signal is time division multiplexed
  • the uplink signal is wavelength division multiplexed.
  • the OLT includes: a light emitting module, a first WDM, a splitter, and m optical receivers; wherein:
  • the optical transmitting module outputs a time-division multiplexed downlink optical signal of a single wavelength to the first WDM, and the first WDM inputs the received time-division multiplexed downstream optical signal into the ODN through a trunk optical fiber;
  • the first WDM receives the upstream optical signals of m wavelengths input by the mains fiber, input to the demultiplexer, and the demultiplexer performs wavelength demultiplexing on the uplink optical signal. After that, m optical receivers are respectively input.
  • the optical transmitting module, the splitter and the m optical receivers in the OLT can be integrated into one optical transceiver module.
  • the above-mentioned splitter may be a heat-sensitive splitter or a heat-independent splitter.
  • the ODN includes a trunk fiber, a wavelength routing unit, and m branch fibers;
  • the wavelength routing unit receives the time division multiplexed downlink optical signal transmitted by the trunk optical fiber output by the OLT, and after splitting the light, respectively input m wavelength tunable ONUs;
  • the routing unit performs wavelength multiplexing on the uplink optical signal, transmits the optical signal through the trunk optical fiber, and inputs the signal to the OLT.
  • the wavelength routing unit used in this embodiment is the same as the wavelength routing unit in Embodiment 1.
  • the wavelength tunable ONU includes WDM, TLS (Tuneable Laser), and an optical receiver.
  • the WDM is set to input the incident time-division multiplexed downstream optical signal to the optical receiver
  • the TLS is set to transmit an upstream optical signal with a certain wavelength and loaded with data.
  • FIG. 3 is a schematic diagram of a downlink time division and uplink wavelength division passive optical network system based on Embodiment 2 above.
  • the downstream optical signal of wavelength D emitted by the optical transmitter is incident on the wavelength division multiplexer WDM, and then incident on the trunk fiber through the multiplex port (COM port) of the WDM.
  • the user side sends out
  • the multi-wavelength uplink signal ⁇ ⁇ 2 , ... ⁇ ⁇ loaded with the uplink signal is incident on the COM port of the WDM through the trunk fiber, is output from the other branch port of the WDM to the branching filter for wavelength demultiplexing, and then is incident on the receiver.
  • Array Rx 1-Rx m is Array Rx 1-Rx m.
  • the time-division multiplexed downlink optical signals are equally divided into the respective branch fibers through the wavelength routing unit, and on the other hand, the uplink multi-wavelength signals of different wavelengths sent from the respective ONUs are incident through each branch fiber.
  • the wavelength routing unit is then multiplexed into the trunk fiber for uplink transmission.
  • the first WDM may also be replaced by an optical circulator.
  • the system shown in Figure 4 can be used, and the ONU can be adjusted in wavelength.
  • the ONU, the downstream light is directly split by the optical splitter, and the upstream signals of different wavelengths are combined by the optical splitter, and then uniformly transmitted to the mains fiber for uplink transmission.
  • the structures of the OLT and the ONU are the same as those in the second embodiment.
  • the difference of the second embodiment is that the splitter is used instead of the wavelength routing unit in the second embodiment.
  • the ODN includes a trunk fiber, a beam splitter, and m branch fibers.
  • the optical splitter receives a single-wavelength time-division multiplexed downlink optical signal transmitted by the OLT output by the OLT, and then splits the signal, respectively Inputting m wavelength-adjustable ONUs; in the uplink direction, the optical splitter receives the optical signals of m wavelengths emitted by the m wavelength-adjustable ONUs from each of the split optical fibers, and then the optical signals
  • the multiplexed wave is input to the OLT via the trunk fiber.
  • the hybrid passive optical network system of this embodiment is shown in FIG. 5.
  • the downlink signal is time division multiplexed, and the uplink signal is wavelength division multiplexed. It includes: OLT, ODN and m+n ONUs connected in sequence, including m reflective ONUs and n wavelength-adjustable ONUs.
  • the structure of the OLT is similar to that of the OLT in Embodiment 1, except that the number of optical receivers is m+n; the structure of the wavelength routing unit is the same as that of the wavelength routing unit in Embodiment 1.
  • the difference between this embodiment and the embodiments 1, 2, 3 is that the type of the ONU includes both reflective types.
  • the ONU further includes a wavelength-adjustable ONU, and only the reflective ONU requires seed light. Therefore, in the embodiment, the seed light transmitted by the seed light source module can include the same number of wavelengths as the reflective ONU.
  • the seed light contains a wavelength different from the wavelength emitted by the tunable laser.
  • the seed light source module can also output seed light including m+n wavelengths, and the transmitting end of the wavelength-adjustable ONU can be equipped with an optical isolator including upper and lower wavelength ranges, and the optical isolator can isolate the light of the corresponding wavelength. .
  • the wavelength-tunable ONU receives the seed light, it can be isolated using an optical isolator.
  • the OLT includes: a seed light source module, a light emitting module, a first WDM, an optical circulator, a splitter, and m+n optical receivers;
  • the seed light source module of the OLT outputs seed light of m or m+n wavelengths to the first WDM
  • the optical transmitting module outputs a time-division multiplexed downlink optical signal of a single wavelength to the first WDM
  • the first WDM pairs receive the After the seed light and the time division multiplexed downlink optical signal are combined,
  • the optical circulator Inputting a first port of the optical circulator; the optical circulator outputs the time division multiplexed downlink optical signal and the seed light input from the first port through the second port;
  • the splitter performs wavelength demultiplexing on the upstream optical signal. After that, the optical signals of different wavelengths are respectively input to the corresponding optical receivers.
  • the ODN includes a trunk fiber, a wavelength routing unit, and m+n branch fibers.
  • the wavelength routing unit receives a single wavelength time division multiplexed downlink optical signal transmitted by the OLT output via the trunk fiber.
  • the seed light is wavelength-demultiplexed, and the optical signal input to each reflective ONU includes seed light of a corresponding wavelength and a time-division multiplexed downstream optical signal of a single wavelength, which is adjustable to each wavelength.
  • the optical signal input by the ONU includes a time-division multiplexed downstream optical signal of a single wavelength (or a seed light including a corresponding wavelength and a time-division multiplexed downstream optical signal of a single wavelength);
  • the wavelength routing unit In the uplink direction, after receiving the uplink optical signals transmitted by the m+n ONUs of the optical fibers of each branch, the wavelength routing unit performs wavelength multiplexing on the optical signals, and then transmits the optical fibers through the trunk optical fiber. OLT.
  • the seed light source module can be implemented in three ways. The first is to output a seed light source containing all m+n wavelengths. The second and third types are respectively shown as shown in Figs. 6a and 6b, and only the seed light sources of m wavelengths are output. If the seed light source is composed of a multi-wavelength laser, it is only necessary to directly turn on and off the laser of the corresponding wavelength channel. Control the number of output wavelengths, see Figure 6a; If the seed source is implemented by a broad-spectrum source (such as an ASE source, SLED, etc.), then it needs to be adjustable at the output of the source through an external multi-wavelength channel. The variable optical attenuator VOA controls the final output wavelength number, see Figure 6b.
  • a broad-spectrum source such as an ASE source, SLED, etc.
  • the above system uses the form of time division multiplexing instead of wavelength division multiplexing, which not only realizes the downlink bandwidth equivalent to the wavelength division multiplexing passive optical network, but also greatly reduces the cost.
  • the uplink and wavelength division multiplexing method completely eliminates the problem of "rogue ONU" in the ordinary time division multiplexing passive optical network.
  • the uplink signal retains the continuous mode, the transmission and reception techniques of the uplink signal are greatly reduced in difficulty, and the difficulty of upgrading the uplink signal rate in the future is also reduced.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé et un système de réseau optique passif, un terminal de ligne optique et une unité de routage de longueur d'onde. Le système de réseau optique passif utilise le multiplexage par répartition dans le temps pour les signaux de liaison descendante et le multiplexage par répartition en longueur d'onde pour les signaux de liaison montante. Le système comprend : un OLT, un ODN et n ONU réfléchissantes connectées séquentiellement à un OLT comprenant un module de source de lumière d'amorçage, un module électroluminescent, un premier WDM, un circulateur de lumière, un séparateur de longueur d'onde et une pluralité de récepteurs de lumière.
PCT/CN2011/077919 2010-11-16 2011-08-02 Procédé et système de réseau optique passif, terminal de ligne optique et unité de routage de longueur d'onde WO2012065460A1 (fr)

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CN101986718B (zh) * 2010-11-16 2014-06-11 中兴通讯股份有限公司 无源光网络系统及系统中的光线路终端和波长路由单元
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CN102546005B (zh) * 2011-12-22 2014-10-01 上海大学 带宽共享的无源光接入网系统和实现方法
CN102412903B (zh) * 2011-12-28 2014-07-02 重庆朗天通讯股份有限公司 一种基于xpon系统的新型光线路终端olt
CN102833030B (zh) * 2012-08-31 2015-05-27 烽火通信科技股份有限公司 基于周期性光可调滤波器的twdm-pon onu实现装置及方法
WO2014063349A1 (fr) * 2012-10-26 2014-05-01 华为技术有限公司 Procédé et système de communication sur un réseau optique passif, et terminaison de ligne optique
CN103297872A (zh) * 2013-06-19 2013-09-11 苏州彩云飞电子有限公司 多波长无源光网络系统
CN103281612A (zh) * 2013-06-19 2013-09-04 苏州彩云飞电子有限公司 多波长无源光网络系统的下行传输方法
CN103281610A (zh) * 2013-06-19 2013-09-04 苏州彩云飞电子有限公司 多波长无源光网络系统
CN105934899B (zh) * 2013-07-05 2019-05-28 华为技术有限公司 光网络单元(onu)波长自调谐
CN104023282B (zh) * 2014-05-29 2017-05-17 烽火通信科技股份有限公司 基于波分pon系统的开放网络架构及信号传输方法
CN107547165B (zh) * 2016-06-24 2019-07-05 中兴通讯股份有限公司 光线路终端、信号传输方法及装置
CN109600167B (zh) * 2018-11-27 2021-09-03 成都成电光信科技股份有限公司 一种数字阵列雷达光纤传输网络及其控制方法
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CN113596634B (zh) * 2021-07-30 2023-09-26 武汉光迅科技股份有限公司 一种Combo PON OLT单片集成芯片及其光组件
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