WO2007143931A1 - Réseau optique passif à multiplexage par répartition en longueur d'onde wavelena - Google Patents

Réseau optique passif à multiplexage par répartition en longueur d'onde wavelena Download PDF

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Publication number
WO2007143931A1
WO2007143931A1 PCT/CN2007/001819 CN2007001819W WO2007143931A1 WO 2007143931 A1 WO2007143931 A1 WO 2007143931A1 CN 2007001819 W CN2007001819 W CN 2007001819W WO 2007143931 A1 WO2007143931 A1 WO 2007143931A1
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WIPO (PCT)
Prior art keywords
optical
downlink
laser
fiber
network system
Prior art date
Application number
PCT/CN2007/001819
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English (en)
Chinese (zh)
Inventor
Jian Miao
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Jian Miao
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Publication date
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Publication of WO2007143931A1 publication Critical patent/WO2007143931A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0305—WDM arrangements in end terminals

Definitions

  • the present invention relates to fiber optic communications, and more particularly to a wavelength division multiplexed passive optical network based on a high power fiber laser. Background technique
  • WDM Wavelength Division Mutiplexing
  • FTTH Fiber To The Home
  • the deployment of optical access networks has become a hot topic for major operators and equipment vendors.
  • point-to-point structure includes active double-star structure and passive double-star structure (or passive)
  • Optical Network PON Passive Optical Network
  • TDMA time division multiplexing access
  • WDMA wavelength division multiplexing access
  • SCMA Subcarrier Multiple Access
  • WDM+SCMA WDM+TDMA
  • the basic structure of the PON is: one end of the fiber is connected to the central office (CO: Central Office), and the other end is connected to multiple users through a passive optical splitter (POS: Passive Optical Splitter). N user access is also provided.
  • the single-star structure requires N fiber feeders and 2N transceivers.
  • the active double-star structure requires 1 fiber feeder and 2N+2 transceivers.
  • the PON requires only 1 fiber feeder, N+. 1 transceiver.
  • PON requires the least amount of fiber and transceiver, and the lowest cost, so it is undoubtedly appropriate to promote FTTH construction at this stage.
  • FIG. 2 is a schematic diagram of a triple play FTTH solution using GPON (Gigabit-capable PON) or EPON (Ethernet PON) technology.
  • the system consists of the optical line terminal (OLT: Optical Line Terminal), the optical fiber feeder, the passive optical splitter POS, and the optical equipment unit of the customer premises equipment (ONU: Optical Network Unit).
  • OLT optical line terminal
  • the OLT uniformly packs the downlink audio, video, and other data into Ethernet data frames and sends them to the client in the form of optical signals.
  • the client ONU accepts Ethernet data frames, and processes the data and transmits it to the corresponding terminal, such as a telephone, a television, or a computer.
  • the ONU packs the audio, video, and data into Ethernet data frames and sends them to the OLT as optical signals.
  • the main problem with GPON/EPON is that since multiple users share a transceiver at the central office, the bandwidth that each user can actually allocate is much smaller than the bandwidth of the transceiver. Taking 32 EPON access as an example, each user is equipped with a transceiver with a bandwidth of 1.25 Gbps, but the average bandwidth after sharing is only about 30 Mbps. Although 30Mbps has greatly exceeded the bandwidth of current copper access, in the future, in the context of triple play, with the popularity of broadband applications such as HDTV, it is expected that 30Mbps bandwidth will become a new access bottleneck by 2010.
  • the principle of WDM-PON is shown in Figure 3.
  • the system uses 2N wavelengths to provide access services for N users.
  • Each user uses one wavelength for uplink and downlink, where wavelengths are 1 ⁇ 2 +1 and ⁇ ⁇ +2 . . ⁇ 2 ⁇ is used for data downlink, and enters the downlink fiber through the central-end WDM multiplexing device, and is allocated to different users after the remote node RN close to the user is demultiplexed; 2 .. 1 ⁇ is used for data uplink, The remote node is multiplexed into the upstream fiber and received by the receiver after the central office is demultiplexed.
  • DFB lasers are used as WDM light sources for high-rate data transmission; at low rates, low-cost spectrum-slicing schemes can be considered; each user is equipped with LEDs of the same spectral structure, The wide spectral signal is filtered out of different wavelengths by wavelength division multiplexing/demultiplexing for uplink/downlink data transmission.
  • the low cost advantage of the spectral segmentation scheme comes from two aspects.
  • the cost of lasers, laying and operation and maintenance is drastically reduced.
  • the shortcomings of the spectral segmentation scheme are also obvious: the LED itself has a small luminous power (about -10 dBm), and the spectral segmentation causes a large power loss, resulting in a low received optical power and an increased system error rate. Only by reducing the data transmission rate can the system maintain a low bit error rate. Therefore, the LED spectrum division scheme can only be applied to low-rate access.
  • the previous segment is a modulated signal for transmitting downlink data.
  • the latter segment is unmodulated continuous light, which is modulated by the user terminal (ONU).
  • Loopback used to transmit upstream data. This solution simplifies the customer-side laser, but the central office needs to be equipped with a high-cost DFB or DBR laser, which hinders further cost reduction.
  • the FP-LD produces a laser output that contains multiple longitudinal modes (multiple wavelengths) and is not suitable for WDM applications.
  • Chang-Hee Lee et al. used the injection mode locking principle of FP-LD to generate broadband incoherent light by self-radiation of erbium-doped fiber, and obtained a narrow-band source by spectral splitting, which was injected into FP-LD, forcing FP-LD to produce single longitudinal
  • the laser output of the mode is successfully applied to WDM-PON with a wavelength of 32 km and an access distance of 20 km.
  • Their experimental system is shown in Figure 5.
  • the broadband broadband source (BLS: Broad-band Light Source) provides broadband incoherent light, which is sent to the downstream fiber through the circulator, injected into the FP-LD, forcing the FP-LD to produce a single longitudinal mode. Laser output.
  • the FP-LD is directly modulated, and the signal light is multiplexed by the AWG wavelength and sent to the optical fiber for uplink. After the central circulator, the receiver RX reads the data.
  • Er-Yb co-doped fiber laser can even produce more than 1000W output power around 1565nm (JK Sahu et al, "A 103W erbium/ytterbium co-doped large-core fiber laser," Opt. Commun., vol. 227 , pp.159-63, 2003).
  • optical modulators are also an important component because continuous lasers must be modulated to load data.
  • Currently used optical modulators generally use III-V semiconductor or lithium niobate (LiNbO 3 ) materials, which are expensive and suitable for long-distance high-rate optical communication, and are not suitable for low-cost access network applications.
  • Intel Corporation has made breakthroughs in the research of optical modulation devices (A. Liu et al, "A high-speed silicon optical modulator based on a metal-oxide-semi-conductor capacitor," Nature, vol.427, pp .615-618, Feb.12, 2004, and Intel Technology Journal, vol. 8, issue 2, pp.
  • the wavelength division multiplexing passive optical network system of the present invention comprises:
  • a fiber optic transmission central office device the device outputs a downlink optical signal loaded with a downlink data packet through a WDM multiplexer;
  • An optical fiber feeder configured to transmit the downlink optical signal loaded with the downlink data packet and a continuous laser, which may also be used to transmit an uplink optical signal loaded with an uplink data packet;
  • the receiving end includes a remote node and a plurality of user equipments, where the remote node includes a WDM demultiplexer for demultiplexing the downlink optical signal, and the user equipment obtains the downlink after the demultiplexing And modulating the continuous laser to generate an upstream optical signal loaded with an uplink data packet, and transmitting the optical signal to the central office equipment through an optical fiber feeder.
  • the remote node includes a WDM demultiplexer for demultiplexing the downlink optical signal
  • the user equipment obtains the downlink after the demultiplexing And modulating the continuous laser to generate an upstream optical signal loaded with an uplink data packet, and transmitting the optical signal to the central office equipment through an optical fiber feeder.
  • the central office device further includes a high power fiber laser generating device, a passive optical power splitter, and a light modulator, wherein the continuous laser outputted by the high power laser is divided into multiple paths by the passive optical power splitter, Modulating each successive laser by the optical modulator for loading the lower portion containing the downlink data
  • the line data packet provides the user with a continuous laser as the light source of the uplink signal, and each of the optical signals after the loading of the downlink data packet and the continuous laser light are transmitted into the optical fiber feeder through the TOM multiplexer.
  • the present invention further provides a single wavelength point-to-point fiber access network system, the access network system comprising:
  • the optical fiber transmission central end device includes a high power fiber laser and a passive optical power splitter and a modulator working therewith, wherein the continuous laser outputted by the high power laser is divided into multiple paths by the passive optical power splitter, and Modulating each continuous laser by the modulator for loading a downlink data packet;
  • a plurality of optical fiber feeders for transmitting a downlink optical signal loaded with a downlink data packet, a continuous laser light as a user terminal light source, and an uplink optical signal loaded with an uplink data packet;
  • a client device where each client end corresponds to a group of the fiber feeders for acquiring downlink data packets.
  • the client also includes a modulator for modulating the continuous laser and loading the upstream packets.
  • the wavelength division multiplexing optical fiber network of the present invention has a simple principle and is convenient to implement. By sharing a fiber laser with multiple users, the cost of the light source can be greatly reduced, the bandwidth can reach 1 Gbps, and it is easy to upgrade to a higher rate. DRAWINGS
  • 1 is a schematic diagram of the basic structure of a passive optical network
  • FIG. 2 is a schematic diagram of a triple play solution using GPON or EPON technology
  • FIG. 3 is a schematic diagram of the principle of WDM-PON
  • FIG. 4 is a schematic diagram of a WDM access network using optical loopback technology
  • FIG. 5 is a schematic diagram of a WDM-PON in which an FP laser is injected using spontaneous emission;
  • Figure 6 is a schematic view of an embodiment of the present invention.
  • Figure 7 is a schematic view of another embodiment of the present invention.
  • Figure 8 is a schematic view of still another embodiment of the present invention.
  • FIG. 9 is a schematic illustration of still another embodiment of the present invention. detailed description
  • FIG. 6 is a schematic diagram of a wavelength division multiplexing passive optical network according to the present invention.
  • the solution includes a central office device 100, a receiving end 200, and an optical fiber feeder 1 connected to the central office and the receiving end.
  • the central office device 100 a high-power single-wavelength fiber laser array 110 comprising N high-power single-wavelength fiber lasers, and a multi-stage passive optical power splitter 120, a modulator array 130, and a wavelength division multiplexer 140 matched thereto; 100 also includes a receiver array 150 and a wave decomposition multiplexer 160 that cooperates therewith.
  • the receiving end 200 includes a remote node 210 and a client device 220, and the remote node 210 includes a wavelength division multiplexer 211 and a wave.
  • the demultiplexer 212, the client device 220 includes a receiver 221 and a matching optical splitter 222 and a circulator 223.
  • the client device 220 further includes a modulator 224.
  • N high-power single-wavelength fiber lasers 110 respectively output different single-wavelength continuous lasers ( ⁇ ⁇ 5 ⁇ 2 ... ⁇ ⁇ ), and each laser is divided into multiple paths by multi-stage passive optical power splitter 120, and modulated by The processor 130 modulates each successive laser to load the downlink data; after the modulation, the downlink data packet is composed of two parts, the first half is the downlink data, and the second half is the continuous "1" (ie, the continuous light wave).
  • the multi-path downstream optical signals of different wavelengths are passed through a wavelength division multiplexer (WDM MUX) 140 and a circulator 170 and then merged into a fiber feeder 1 for downlink.
  • WDM MUX wavelength division multiplexer
  • a remote demultiplexer (WDM DEMUX) 212 of the remote node 210 demultiplexes the downstream signals and assigns different wavelengths to different users.
  • WDM DEMUX remote demultiplexer
  • part of the downlink optical power is received by the receiver 221 to acquire downlink data; and another part of the downlink optical power is sent to the modulator 224, and the modulator 224 pairs the downlink data packet.
  • the continuous light wave in the medium is modulated, and after loading the data, it goes up through the circulator 223.
  • the first half of the upstream packet includes the original downlink data, and the second half is modulated as the uplink data.
  • the uplink data packets from different users are multiplexed by the wavelength division multiplexer 211 and then transmitted through the optical fiber feeder 1 for uplink transmission, and then passed through the circulator 170 of the central office device 100 and then solved by the WDM demultiplexer 160.
  • the multiplex is received and received by a corresponding receiver in the receiver array 150 to obtain uplink data.
  • FIG. 8 shows another embodiment of the light source portion of the central office device 500 of the present invention, which uses the multi-wavelength fiber laser 510 and the WDM demultiplexing device 520 to replace the single-wavelength fiber laser array in the above two embodiments. , which can further reduce the number of active devices and reduce costs.
  • a special embodiment of the present invention is a single-wavelength point-to-point solution, which is suitable for point-to-point optical fiber transmission of data, voice, video, and the like.
  • Embodiments in this embodiment include a central office device 600, a receiving end 700, and multiple optical fibers.
  • the central office device 600 includes a high-power laser 610 and a multi-stage passive optical power splitter 620, a modulator 630, and the central office device further includes a plurality of receivers 640.
  • the receiving end 700 includes a receiver 710 and a splitter. The 720 and the modulator 730.
  • the continuous laser output from the high-power fiber laser 610 equipped with the central office equipment 600 is divided into multiple paths by the passive optical power splitter 620, and each continuous laser is modulated by the modulator 630, similar to the first embodiment, the modulated data.
  • the package consists of two parts, the first half is the downlink data, and the second half is the continuous "1" (ie continuous light wave).
  • Each optical signal is transmitted directly to the receiving end through a downlink point-to-point fiber link.
  • part of the optical power is received by the receiver 710 to acquire downlink data; part of the optical power is sent to the modulator 730.
  • Modulator 730 modulates the continuous optical waves in the downstream optical signal, loads the data, and sends it back to the upstream optical fiber.
  • the first half of the uplink packet retains the original downlink data, and the latter half is modulated into the uplink data, and the point-to-point fiber link is sent to the central office device 600 and received by the corresponding receiver 640 to acquire the uplink data.
  • the fiber laser is mature now. Its resonant cavity is short, the structure is simple and compact, and it can be easily integrated into the OLT. It has high power output, low noise, stable operation and long life. It is suitable for carrier-grade applications.
  • All users are equipped with the same ONU.
  • the receiver and modulator are independent of wavelength, which can simplify the operation and maintenance of the system and reduce the management cost.
  • the bandwidth depends only on the bandwidth of the modulator.
  • the modulator can have a bandwidth of 1 Gbps, and can be upgraded to a higher rate if needed and cost-effective.

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

Abstract

La présente invention concerne un système de réseau passif de fibres optiques à multiplexage par répartition en longueur d'onde comprenant : un équipement terminal de bureau à transmission par fibres optiques, un câble d'alimentation à fibres optiques et un terminal de réception. Ledit équipement terminal de bureau comprend un appareil générant un laser monochromatique de haute énergie, un distributeur passif d'énergie et un modulateur optique. Après la répartition du laser continu produit par ledit appareil laser de haute énergie en multiples canaux par ledit distributeur passif d'énergie optique, d'une part, ledit modulateur optique module chaque canal du signal optique pour charger ledit paquet entrant contenant les données entrantes, et d'autre part, il fournit le laser continu en tant que source optique du signal sortant pour l'utilisateur, chaque canal du signal optique chargeant le paquet entrant et les entrées du laser continu dans le câble d'alimentation à fibres optiques par l'intermédiaire dudit multiplexeur WDM. Ledit terminal de réception comprend un nœud d'extrémité distant et un équipement terminal pour multiples utilisateurs, le nœud d'extrémité distant comprenant un démultiplexeur WDM pour démultiplexer le signal optique entrant.
PCT/CN2007/001819 2006-06-09 2007-06-08 Réseau optique passif à multiplexage par répartition en longueur d'onde wavelena WO2007143931A1 (fr)

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CNA2006100275279A CN101087179A (zh) 2006-06-09 2006-06-09 波分复用无源光网络

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CN103072383A (zh) * 2011-10-26 2013-05-01 深圳市大族激光科技股份有限公司 一种振镜式激光打标机及其打标控制卡
CN106301585A (zh) * 2015-05-12 2017-01-04 青岛海信宽带多媒体技术有限公司 一种光模块和发送调制信号的方法
CN112073309A (zh) * 2019-06-10 2020-12-11 永滐投资有限公司 IoT网络架构及其波分IoT网关

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CN102752676B (zh) * 2012-07-12 2015-09-30 青岛海信宽带多媒体技术有限公司 无源光网络及其光网络单元光模块
CN103676052A (zh) * 2013-12-02 2014-03-26 深圳市鼎芯无限科技有限公司 基于无源光纤网络的背板结构
EP2884761B1 (fr) * 2013-12-11 2019-05-22 Alcatel Lucent Procédé de surveillance de la connectivité d'un terminal d'accès optique dans un réseau d'accès optique
CN104753603A (zh) * 2013-12-25 2015-07-01 华为技术有限公司 一种片上光网络系统及一种光功率控制方法
CN104902351B (zh) * 2014-03-07 2018-09-14 国家电网公司 一种智能变电站过程层光纤多波长隔离通信组网方法
CN104540048A (zh) * 2015-01-20 2015-04-22 山东大学 一种基于波分复用无源光网络wdm-pon的光纤、无线融合传感系统及其工作方法
CN112671468A (zh) * 2015-08-20 2021-04-16 中兴通讯股份有限公司 Olt光收发一体模块、处理多种pon的方法及系统
CN109510685B (zh) * 2018-12-03 2020-05-05 武汉邮电科学研究院有限公司 一种超密集波分复用无源光纤网络传输系统及传输方法
CN113507316B (zh) * 2021-06-22 2023-04-18 武汉凹伟能源科技有限公司 单纤双向无源光纤音频传输系统及光纤传输网络

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103072383A (zh) * 2011-10-26 2013-05-01 深圳市大族激光科技股份有限公司 一种振镜式激光打标机及其打标控制卡
CN106301585A (zh) * 2015-05-12 2017-01-04 青岛海信宽带多媒体技术有限公司 一种光模块和发送调制信号的方法
CN112073309A (zh) * 2019-06-10 2020-12-11 永滐投资有限公司 IoT网络架构及其波分IoT网关
CN112073309B (zh) * 2019-06-10 2022-11-15 永滐投资有限公司 IoT网络架构及其波分IoT网关

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