WO2008019612A1 - Source de lumière commune, système de réseau optique passif à multiplexage par répartition en longueur d'onde et procédé permettant au système de partager la source de lumière - Google Patents

Source de lumière commune, système de réseau optique passif à multiplexage par répartition en longueur d'onde et procédé permettant au système de partager la source de lumière Download PDF

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Publication number
WO2008019612A1
WO2008019612A1 PCT/CN2007/070416 CN2007070416W WO2008019612A1 WO 2008019612 A1 WO2008019612 A1 WO 2008019612A1 CN 2007070416 W CN2007070416 W CN 2007070416W WO 2008019612 A1 WO2008019612 A1 WO 2008019612A1
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WIPO (PCT)
Prior art keywords
light source
spectrum light
broad
spectrum
light
Prior art date
Application number
PCT/CN2007/070416
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English (en)
Chinese (zh)
Inventor
Huafeng Lin
Tao Jiang
Jun Zhao
Guo Wei
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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 WO2008019612A1 publication Critical patent/WO2008019612A1/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

Definitions

  • the present invention relates to a wavelength division multiplexing sourceless optical network (WDM-PON), which relates to a common light source, a wavelength division multiplexing passive optical network system and a method for sharing the same.
  • WDM-PON wavelength division multiplexing sourceless optical network
  • the bandwidth demand of users' broadband access will reach 100Mbps or higher, using existing xDSL (digital subscriber line), HFC (Hybrid Fiber) -Coax, Hybrid Fiber Coax), LAN (Local Area Network) access methods will not meet the requirements.
  • xDSL digital subscriber line
  • HFC Hybrid Fiber
  • Hybrid Fiber Coax Hybrid Fiber Coax
  • LAN Local Area Network
  • optical fiber communication technology Due to its huge bandwidth capacity, optical fiber has been favored by more and more telecom operators, and the demand for laying access networks with optical fibers is increasing. Rapid growth.
  • the passive optical network is a user access network that satisfies both the bandwidth requirements of new services and is economical and convenient to operate and maintain.
  • the network structure of the PON is as shown in Figure 1. It includes an optical line terminal (OLT, Optical Line Terminal) 11 in the central office, an optical distribution network (ODN) 12, and many optical network units (ONU). , Optical Network Unit)13.
  • OLT optical line terminal
  • ODN optical distribution network
  • ONU optical network units
  • ONU optical network units
  • Optical Network Unit Optical Network Unit
  • PON can be divided into ATM (Asynchronous Transfer Mode)-based ATM-PON, Ethernet-based EPON (Ethernet PON), and Gigabit Passive Optical Network (GPON). WDM-PON using wavelength division multiplexing and OCDDA-PON using Code Division Multiple Access (CDMA).
  • CDMA Code Division Multiple Access
  • WDM-PON systems have attracted much attention due to their huge bandwidth capacity, information security like point-to-point communication, and simple network structure, but WDM-PON networks for laser sources, modulators, arrayed waveguide gratings (AWG, Array Waveguide) Grating), etc. are very demanding, and the cost has been Staying high has become a bottleneck that hinders its promotion and application.
  • WDM-PON networks for laser sources, modulators, arrayed waveguide gratings (AWG, Array Waveguide) Grating), etc. are very demanding, and the cost has been Staying high has become a bottleneck that hinders its promotion and application.
  • a mainstream solution is to use a wide-spectrum light source and a lock-wave light source, as shown in FIG. 20 has two broad-spectrum light sources, a broad-spectrum light source 1 and a broad-spectrum light source 2, which satisfy the FSR (Free Spectrum Range) relationship of the multiplexer/demultiplexer.
  • FSR Free Spectrum Range
  • the seed light source is respectively provided for each of the lock wave light sources; wherein the wide spectrum light source 1 is each of the OLT (Optical Line Terminal) 201
  • the downlink lock-wave source 21 provides a seed source
  • the broad-spectrum source 2 provides a seed source for the upstream lock-wave source 23 of each ONU (Optical Network Unit) 203.
  • the lock-wave source may be an RSO A (Reflective Semiconductor Optical Amplifier) or a Reflective FP-LD (Faby Perot Laser).
  • the optical amplifier is required to amplify the optical power of the broad-spectrum light source to meet the minimum incident optical power requirement of the lock-wave light source, thereby causing an increase in cost.
  • the two broad-spectrum light sources and optical amplifiers are limited to the same WDM-PON network share, so the sharing is not high.
  • the data control center 301 on the ONU 31 identifies the receiver 304. Whether the downlink data is a wavelength control message or a downlink user data. If a wavelength control message from the OLT 32 is received, the transmission wavelength of the tunable optical transmission module 303 is adjusted to a wavelength specified by the wavelength control message through the wavelength control center 302. , thereby achieving colorlessness of the ONU.
  • the dimming transmitter module in the above solution requires a subsidiary device such as a temperature control and a wavelength calibration device, so the cost reduction is not obvious.
  • the prior art also has a light source solution of a multi-wavelength laser combining wavelength division multiplexing and time division multiplexing (TDM), as shown in FIG. 4 .
  • TDM time division multiplexing
  • the WDM-TDM multi-wavelength laser 41 continuously generates laser light of different wavelengths in a time-division manner, and then passes through the optical amplifier 42 and the branching unit 43, and supplies a laser source to the external modulator 44 of each WDM-PON.
  • the external modulator 44 must modulate the data of different users at different times depending on the wavelength variation of the WDM-TDM multi-wavelength laser.
  • This solution requires a strict synchronization mechanism and a complex multiplexing scheduling mechanism, and since the different wavelengths share a multi-wavelength laser in a TDM manner, the switching time of the multi-wavelength laser is very high, resulting in a multi-wavelength laser being expensive.
  • multi-wavelength lasers will eventually fail to meet the requirements.
  • Embodiments of the present invention provide a common light source that provides light source sharing for multiple WDM-PON systems to reduce the cost of the WDM-PON system.
  • Embodiments of the present invention also provide a wavelength division multiplexing passive optical network system and a method for sharing the same, to reduce system cost.
  • a branching device configured to divide the broad-spectrum light from the broad-spectrum light source into a plurality of identical broad-spectrum lights, and output the divided plurality of identical broad-spectrum lights to a plurality of wavelength-division multiplexed passive lights Network Systems.
  • a method for sharing a light source in a WDM-PON system includes: a wide-speaking light source generating wide-speech light, and outputting the broad-spectrum light to a brancher;
  • the brancher After receiving the wide-spectrum light, the brancher divides it into multiple copies of the same wide-spectrum light and outputs it to a plurality of wavelength division multiplexing passive optical network systems;
  • the plurality of wavelength division multiplexed passive optical network systems perform transmission of data using the received wide spectrum light.
  • a wavelength division multiplexing passive optical network system system includes: a plurality of optical line terminals, each optical line terminal being connected to a plurality of optical network units through a fiber distribution network, where the system further includes :
  • An uplink common light source for generating broad spectrum light, and outputting the broad spectrum light into a plurality of identical broad spectrum lights to the plurality of optical line terminals, and forwarding, by the optical line terminal, the plurality of optical fiber distributions a network for the plurality of fiber distribution networks to spectrally split the laser light required to transmit uplink data of the optical network unit connected to the fiber distribution network;
  • the wide-spectrum light generated by the broad-spectrum light source is used as a common light source, and the splitter is divided into a plurality of identical broad-spectrum light sources and output to each WDM-PON system, so that each WDM-PON system can share the light source, thereby reducing WDM. - PON application cost.
  • Figure 1 is a structural diagram of an existing PON system
  • FIG. 2 is a system diagram of a WDM-PON in which a wide-spectrum light source is used in the prior art
  • FIG. 3 is a system diagram of a WDM-PON using a tunable light source in the prior art
  • FIG. 4 is a diagram of a WDM-PON system of a multi-wavelength laser using wavelength division multiplexing and time division multiplexing in the prior art
  • FIG. 5 is a structural diagram of a common light source according to an embodiment of the present invention
  • FIG. 7 is a diagram of a WDM-PON system for a common light source for use in an embodiment of the present invention.
  • Embodiments of the present invention provide a common light source for a plurality of WDM-PON systems, so that multiple WDM-PON systems share a light source.
  • the broad spectrum light is generated by the broad spectrum light source, filtered by the optical band pass filter, and then amplified by the amplifier and input to the branching device.
  • the splitter is divided into a plurality of identical wide spectrum light sources and output to each WDM-PON system.
  • FIG. 5 A common light source of an embodiment of the invention is shown in FIG. 5:
  • the common light source 50 includes: a broad spectrum light source 501 for generating broad spectrum light, and a splitter 502 for dividing the broad spectrum light from the broad spectrum light source 501 into a plurality of identical broad spectrum lights. .
  • the optical band pass filter 503 and the optical amplifier 504 may be disposed in the common light source 50.
  • the optical bandpass filter 503 is used to filter the broad spectrum light generated by the broad spectrum light source 501; the optical amplifier 504 is used to optically amplify the broad spectrum light generated by the broad spectrum light source 501.
  • the wide-spectrum light generated by the broad-spectrum light source 501 passes through the optical band-pass filter 503, is amplified by the optical amplifier 504, and then splits into N identical identical broad-spectrum light sources through the splitter 502, and outputs the output to each.
  • WDM-PON is used.
  • a backup light source 505 can also be designed. When the broad spectrum light source fails, the backup light source starts to work, and is coupled to the optical band pass filter through the coupler 506 to complete the function of the broad spectrum light source.
  • the branch of the common light source is not limited to one level, and the method of multi-level branching can be used to further increase the sharing degree of the public light source. As shown in Fig. 6, a common light source using two-stage branches is used.
  • the wide-spectrum light generated by the broad-spectrum light source 501 in the common light source 60 passes through the optical band-pass filter 503, and is amplified by the first-stage optical amplifier 61.
  • the first-stage splitter 62 is divided into a plurality of identical wide-spectrum light sources, wherein the first wide-spectrum light is directly sent to one WDM-PON, and the second wide-spectrum light passes through the second-stage optical amplifier 63.
  • the amplification is then divided into a plurality of identical wide-spectrum light sources through the second-stage splitter 64, and the output is sent to a plurality of WDM-PONs for use.
  • a common light source using two-stage branches is shown, and in this manner, a common source of multi-stage branches can also be used. It can be seen that the common light source provided by the embodiment of the present invention can provide light source sharing for multiple WDM-PON systems at a low cost, thereby reducing the cost of the WDM-PON system.
  • the wide-spectrum light source in the above common light source may be a light emitting diode (LED), a super-luminescent LED (SLED), or an amplified spontaneous emission (ASE).
  • LED light emitting diode
  • SLED super-luminescent LED
  • ASE amplified spontaneous emission
  • an optical amplifier may be an erbium doped fiber amplifier (EDFA, erbium-doped fiber amplifier ) 3 ⁇ 4 semiconductor amplifier (SOA, semiconductor optical amplifier), or Raman amplifiers.
  • EDFA erbium doped fiber amplifier
  • SOA semiconductor optical amplifier
  • Raman amplifiers Raman amplifiers
  • the spectral division of the wide-spectrum light source input into each WDM-PON can be realized by an AWG (Array Waveguide Grating), and after the AWG spectral line division, the broad-spectrum light source is divided into wavelengths respectively.
  • the wavelength spacing is determined by the channel spacing of the AWG.
  • the amplified wide-spectrum light source is divided into wide-spectrum light sources with small power by the branching device, in order to ensure a sufficiently long transmission distance and a sufficiently large injection power, the spectrum is entered into each WDM-PON system. Before the splitting, you can perform another light amplification.
  • a simple, low-cost WDM-PON system can be constructed, such as In this system, there are two common light sources, a down common light source 71 and an upcoming common light source 72.
  • the downlink common light source 71 is configured to provide a downlink wide-spectrum light source for the OLT 70 of each WDM-PON system, and the wide-spectrum light output by the downlink common light source 71 is amplified by the optical amplifier 701 in the OLT 70, and then by a spectral splitter (which may be an AWG) 702
  • the amplified broad-spectrum light is segmented to obtain laser light having wavelengths of ⁇ , ⁇ 2, ...
  • the intermediate transmission is sent to each ONU, and the downlink light carrying the user data is transmitted to the receiver of each ONU through the ODN, thereby completing the transmission of the downlink data.
  • the uplink common light source 72 provides an uplink light source for the ONU located on the user side of the WDM-PON system, and the wide spectrum light output by the uplink common light source 72 is amplified by the optical amplifier 704 in the OLT 70, and then transmitted to the 705 and the circulator 706 through the coupler 705 and the circulator 706.
  • the AWG73 of the remote node after the line division of the AWG73, will provide each ONU 74 with a laser for transmitting uplink data.
  • the wide spectrum source 710 in the down common light source 71 and the wide spectrum source 720 in the upside common source satisfy the AWG.
  • each ONU 74 will receive lasers having wavelengths of ⁇ +FSR, ..., ⁇ +FSR, respectively, and after loopback modulation by the ONU 74, will be sent back through the ODN network.
  • the uplink receiving module 707 of the OLT 70 completes the uplink data transmission.
  • the ONU loopback modulation can be implemented by using an injection-locked Fabry-Perot laser FP-LD laser (injection locked FP-LD) or RSOA as a direct modulation laser.
  • the wide-spectrum light generated by the wide-spectrum light source 710 in the downlink common light source 71 is filtered by the optical band-pass filter 711 and input to The optical amplifier 712 performs amplification, and the amplified broad-spectrum light is input to the branching device 713, and the branching device 713 divides the input wide-spectrum light into a plurality of identical broad-spectrum lights, and each of the broad-spectrum lights is input to a WDM-PON.
  • each OLT 70 amplifies the received wide-spectrum light through the optical amplifier 701, and then inputs it to the spectral divider 702 for segmentation, and divides the broad-spectrum light into laser beams having wavelengths of ⁇ 1, ⁇ 2, ... ⁇ , and then Through the modulator array 703, the downlink unicast data of each user is separately modulated into the narrowband lasers with the wavelengths ⁇ 1 ⁇ ⁇ ⁇ respectively, and the downlink light carrying the user data is transmitted to the receiver 741 of each ONU 74 through the ODN, as shown in FIG. 7 .
  • the laser with a wavelength of ⁇ is transmitted to the ONU1, and the laser with a wavelength of ⁇ 2 is transmitted to the ONU2, and the wavelength is ⁇ .
  • the optical transmission to the ONUn, the receiver 741 in each ONU 74 completes the photoelectric conversion and demodulation function of the optical signal carrying the downlink data of the ONU user, and recovers the downlink data of the user, thereby completing the downlink data transmission.
  • the wide-spectrum light generated by the wide-spectrum light source 720 in the upstream common light source 72 is filtered by the optical band-pass filter 721, input to the optical amplifier 722 for amplification, and the amplified broad-spectrum light is input to the branching device 723.
  • the brancher 723 divides the input wide-spectrum light into a plurality of identical wide-spectrum lights, and each of the broad-spectrum lights is input to an OLT 70 of a WDM-PON, and each OLT 70 amplifies the received wide-spectrum light through an optical amplifier 704.
  • the ONU 74 receives the light of the wavelength ( ⁇ +FSR)
  • the loopback modulation unit 742 performs injection locking or reflection amplification on the received laser to generate laser light, and simultaneously modulates the uplink data to the injection locking or reflection amplification.
  • the upstream light carrying the uplink data of the user is sent back to the remote AWG 73, and the AWG 73 receives the optical signals carrying the uplink data of each user from each ONU 74, respectively, and is +FSR) ⁇ (n+FSR) optical signals, and then The optical signals having wavelengths of +FSR) ⁇ (n+FSR) are combined into one upstream mixed light, and transmitted to the circulator 706 of the OLT 70, and then transmitted to the upstream data processing module 707 in the OLT for subsequent processing.
  • the uplink data processing module 707 of the OLT 70 After receiving the uplink mixed light from the ODN, the uplink data processing module 707 of the OLT 70 passes through the multiplexing demultiplexer AWG, and separates the optical signals having the wavelengths ( ⁇ +FSR) ( ⁇ +FSR), respectively, and sends them to different signals.
  • the photoelectric conversion and demodulation device recovers the uplink data of each user.
  • the wide-spectrum light generated by the broad-spectrum light source is used as a common light source, and the splitter is divided into a plurality of identical broad-spectrum light sources and output to each WDM-PON system, so that each WDM-PON system can share the light source, thereby The application cost of the WDM-PON is reduced.
  • the common light source of the WDM-PON system of the embodiment of the present invention is continuous, and does not require a synchronization and scheduling mechanism, which is beneficial to the implementation and application of the system.

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

Abstract

L'invention concerne une source de lumière commune, un système de réseau optique passif à multiplexage par répartition en longueur d'onde et un procédé permettant au système de partager la source de lumière. Cette source de lumière commune comprend une source de lumière à large spectre servant à générer une lumière à spectre large, un séparateur servant à diviser cette lumière à spectre large en plusieurs lumières à spectre large identiques et à fournir la lumière à spectre large à plusieurs systèmes de réseau optique passifs à multiplexage par répartition en longueur d'onde. Selon cette invention, la lumière à spectre large produite par la source de lumière à spectre large est filtrée par le filtre passe-bande de lumière à spectre large, puis elle est entrée dans le séparateur après avoir été amplifiée par l'amplificateur, plusieurs sources de lumière à spectre large identiques engendrées par le séparateur sont émises vers un réseau optique passif à multiplexage par répartition en longueur d'onde, de manière à diminuer le coût d'application du réseau optique passif à multiplexage par répartition en longueur d'onde.
PCT/CN2007/070416 2006-08-15 2007-08-06 Source de lumière commune, système de réseau optique passif à multiplexage par répartition en longueur d'onde et procédé permettant au système de partager la source de lumière WO2008019612A1 (fr)

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CN200610062125.2 2006-08-15
CNA2006100621252A CN101127571A (zh) 2006-08-15 2006-08-15 一种wdm-pon系统共享的公共光源及光源共享的方法

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US20110091210A1 (en) * 2009-10-21 2011-04-21 Futurewei Technologies, Inc. Coupled Seed Light Injection for Wavelength Division Multiplexing Passive Optical Networks

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CN101902665B (zh) * 2009-05-26 2014-05-07 华为技术有限公司 光线路终端、光分插复用器和光接入系统
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CN102131129A (zh) * 2010-04-28 2011-07-20 华为技术有限公司 无源光网络中上行信号的接收方法、装置和系统
US8995836B2 (en) * 2010-07-13 2015-03-31 Futurewei Technologies, Inc. Passive optical network with adaptive filters for upstream transmission management
EP2487821B1 (fr) 2011-02-11 2018-06-27 Alcatel Lucent WDM PON doté d'ONU existants non réglables
CN104065415A (zh) * 2013-03-18 2014-09-24 北京邮电大学 一种基于瑞利散射效应实现无色onu上行波长的装置及方法
CN105580222A (zh) * 2013-09-26 2016-05-11 华为技术有限公司 光发射系统
CN107437965B (zh) * 2016-05-25 2020-12-04 上海诺基亚贝尔股份有限公司 Wdm-pon系统中支持高速信号传输的方法及其装置
CN106572402A (zh) * 2016-10-28 2017-04-19 南京邮电大学 一种混合时分波分无源光网络系统架构改进方法
CN111431602B (zh) * 2019-01-10 2021-08-06 中国移动通信有限公司研究院 一种前传网络系统及其光源的产生方法
CN112511229B (zh) * 2019-09-16 2022-08-30 中国移动通信有限公司研究院 前传网络系统及光模块
CN115460483A (zh) * 2021-06-09 2022-12-09 华为技术有限公司 一种交换机以及通信系统

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