WO2015127780A1 - 一种支持监控信道光单纤双向传送的otn系统及方法 - Google Patents

一种支持监控信道光单纤双向传送的otn系统及方法 Download PDF

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WO2015127780A1
WO2015127780A1 PCT/CN2014/087159 CN2014087159W WO2015127780A1 WO 2015127780 A1 WO2015127780 A1 WO 2015127780A1 CN 2014087159 W CN2014087159 W CN 2014087159W WO 2015127780 A1 WO2015127780 A1 WO 2015127780A1
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optical
station
light
unit
monitoring channel
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French (fr)
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梅亮
李健源
曹云
刘中华
廖原
柴焦
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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Priority to RU2016100225A priority Critical patent/RU2642473C1/ru
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters

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  • the present invention relates to the field of OTN networks, and in particular to an OTN system and method for supporting bidirectional transmission of optical single-fiber transmission channels.
  • the optical network transmission equipment can also realize the ground transmission of time synchronization information through the bearer of the IEEE1588V2 protocol, and transmit the time synchronization information from the ground bearer equipment to each base station to achieve high-precision time synchronization.
  • OTN Optical Transport Network
  • An OTN (Optical Transport Network) network with multiple wavelengths and large capacity and electrical cross-scheduling flexibility is gradually sinking to the aggregation or access level.
  • the transmission of IEEE1588V2 in OTN networks is also increasingly used.
  • the traditional OTN network is generally a dual-fiber bidirectional network structure, and the service optical and monitoring channels in the same direction. In the same optical fiber, most bearer services are not symmetrically required for transmission and reception delay symmetry. Therefore, there may be an increase in the delay in the transmission and reception path between the OTM sites of the OTN network (there may be multiple simple optical amplification stations in the middle). Although the asymmetry difference can be compensated after being measured and set to the processing unit of IEEE1588V2, the extensive engineering and the complexity of the test make this method engineering difficult to promote.
  • the bearer mode of IEEE1588V2 in OTN network equipment mainly has in-band (service Optical transmission) and out-of-band (monitoring channel optical transmission). Since the in-band mode is carried by the service optical wavelength, and the service optical wavelength adopts different optical fibers on the transmission path, there is a problem that the transmission and reception delay is asymmetric, and it also appears in the process of mapping and multiplexing of services and joining FEC. Delayed changes.
  • an object of the present invention is to provide an OTN system and method for supporting bidirectional transmission of a single optical fiber of a monitoring channel, which uses an outband transmission method to transmit the basis of the IEEE 1588 V2, so that the optical transmission and reception of the optical wavelength of the monitoring channel is performed.
  • an optical fiber In an optical fiber, the asymmetry of the transmission and reception paths is avoided, and the delay of transmission and reception is ensured.
  • the present invention provides an OTN system supporting bidirectional transmission of a single optical fiber of a monitoring channel, including an upstream station and a downstream station that mutually transmit service light, each of which is provided with two optical amplifying units and one optical monitoring unit.
  • Channel unit each station further comprises a multiplexer unit, the multiplexer unit comprises an optical circulator and a multiplexer, and the output of the optical monitoring channel unit is connected to the optical path of the optical circulator, and the optical circulator is common
  • the port is connected to the optical path of the multiplexer, and the lower port of the optical circulator is connected to the input optical path of the optical monitoring channel unit; the multiplexer and the splitter of the two stations are connected by two optical fibers, and one optical fiber includes bidirectional transmission monitoring.
  • Channel light and forward traffic light, and the other fiber contains reverse traffic light.
  • the two optical amplifying units of the upstream station are divided into a forward transmitting amplifying unit that transmits forward traffic light, and a reverse receiving amplifying unit that receives reverse traffic light, and a forward transmitting amplifying unit.
  • the two optical amplifying units of the downstream site are divided into a forward receiving amplifying unit that receives forward traffic light, and a reverse transmitting amplifying unit that transmits reverse traffic light,
  • the receiving amplifying unit is connected to the splitter optical path of the downstream station.
  • the present invention also provides a method for supporting bidirectional transmission of optical single-fiber transmission of a monitoring channel based on the above system, and the forward traffic light is amplified and then enters the upstream station and the split-wave unit, and passes through the station.
  • the two-way monitoring channel of the point-light circulator is combined and transmitted to a downstream station through a fiber; the service light transmitted to the downstream station is separated by the multiplexer unit of the station, and output to the station and connected to the multiplexer and the splitter.
  • An optical amplifying unit the bidirectional monitoring channel light is separated by the optical circulator by two different directions of light, and the optical paths are respectively connected to the input port and the output port of the optical monitoring channel unit of the station; the upstream station receives the slave station from the downstream station in the same manner Business light.
  • the reverse service light is amplified by an optical amplifying unit that is not connected to the multiplexer/demultiplexer in the downstream station, and then transmitted to an optical amplifying unit of the upstream station through a single optical fiber, and The optical amplifying unit is not connected to the combiner and the splitter of the station.
  • the present invention further provides an OTN system for supporting bi-directional transmission of optical single-fiber transmission of a channel, comprising an upstream station and a downstream station for transmitting service light to each other, each of which is provided with two optical amplifying units and one optical monitoring channel unit.
  • Each station further includes an optical line protection unit, and the optical line protection unit is provided with a multiplexer unit, and the multiplexer unit includes an optical circulator and a multiplexer, an output of the optical monitoring channel unit and an optical path on the optical circulator.
  • the common port of the optical circulator is connected to the optical path of the multiplexer, and the lower port of the optical circulator is connected to the input optical path of the optical monitoring channel unit;
  • the multiplexer of the upstream station is connected to a coupler, the downstream station
  • the multiplexer and splitter are connected to an optical switch, and the coupler and the optical switch are connected by a main line fiber and a spare line fiber.
  • the two optical amplifying units of the upstream station are divided into a forward transmitting amplifying unit that transmits forward traffic light, and a reverse receiving amplifying unit that receives reverse traffic light, and a forward transmitting amplifying unit.
  • the two optical amplifying units of the downstream station are divided into a forward receiving amplifying unit that receives forward traffic light, and a reverse transmitting amplifying unit that transmits reverse traffic light,
  • the receiving amplifying unit is connected to the optical path of the multiplexer and the splitter of the station.
  • the upstream station further includes an optical switch, and the reverse receiving amplifying unit is connected to the optical switch optical path;
  • the downstream station further includes a coupler, and the reverse transmitting amplifying unit of the downstream station
  • the coupler optical path of the station is connected;
  • the optical switch of the upstream station and the coupler of the downstream station are connected by the main and standby line fibers.
  • the optical switch is a 2 ⁇ 2 optical switch
  • the coupler is a 1:2 coupler
  • the optical switch is further connected to an optical power detector.
  • the invention also provides a method for supporting bidirectional transmission of optical single-fiber transmission of a monitoring channel based on the system, wherein the forward service light is combined with the bidirectional monitoring channel light passing through the circulator through the multiplexer and the output is coupled to the optical coupling.
  • the device is distributed to the forward main and standby line fibers; at the downstream station, the optical switch is connected to an optical power detector, and the main and standby line lights are selected by the optical switch, and then connected to the optical power detector and connected to the same.
  • the splitter splits the service light from the monitor channel light, and the separated service light is output to the optical amplifying unit of the station, and the separated monitor channel light is connected to the optical monitoring channel unit of the station via the optical path of the circulator;
  • the upstream site receives the traffic light from the downstream site in the same manner.
  • the upstream station further includes an optical switch, the reverse receiving amplifying unit is connected to the optical switch optical path, and the optical switch is further connected to an optical power detector;
  • the downstream station further includes a coupler
  • the reverse transmission amplifying unit of the downstream station is connected to the coupler optical path of the station;
  • the optical switch of the upstream station and the coupler of the downstream station are connected by the main and standby line optical fibers, and the reverse direction service light is amplified.
  • the optocoupler entering the downstream site is distributed to the main and standby fiber optic lines in the opposite direction.
  • the optical switch is selected by the station, and one service light enters the optical power detector of the station, and the optical amplifying unit is output to the station. .
  • the invention has the beneficial effects that the IEEE1588V2 is transmitted by using the optical monitoring channel that does not carry the service signal, and there is no delay variation introduced in the bearer mode.
  • the optical circulator is set up in the OTN network to make it a single-fiber bidirectional transmission mode, thereby avoiding the asymmetry of the service transmission and reception path and having no influence on the window wavelength of the bearer service.
  • FIG. 1 is an optical path diagram of a single-fiber bidirectional OTN system with symmetric service transmission and reception paths according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a multiplexer unit of an upstream station in a first embodiment of the present invention
  • FIG. 3 is an optical path diagram of a single-fiber bidirectional OTN system with symmetric service transmission and reception paths according to a second embodiment of the present invention
  • Figure 4 is a system light path diagram of the more detailed structure of Figure 3.
  • an OTN system supporting monitoring channel optical single-fiber bidirectional transmission includes an upstream station and a downstream station that transmit service light to each other, and each station has two OAs (optical amplifiers). And an optical supervisory channel unit (OSC), each station further comprising a multiplexer unit (OSC AD), the multiplexer unit comprising an optical circulator and a multiplexer.
  • OSC optical supervisory channel unit
  • each station further comprising a multiplexer unit (OSC AD), the multiplexer unit comprising an optical circulator and a multiplexer.
  • the output of the optical monitoring channel unit is connected to the optical path of the optical port on the optical circulator.
  • the common port of the optical circulator is connected to the optical path of the multiplexer, and the lower optical port of the optical circulator is connected to the input optical path of the optical monitoring channel unit.
  • the two OAs of the upstream site are divided into a forward transmitting OA that transmits forward traffic light, and a reverse receiving OA that receives reverse traffic light, and the forward transmitting OA is connected to the optical splitter optical path of the upstream site.
  • the two OAs of the downstream station are divided into a forward receiving OA that receives the forward traffic light, and a reverse transmitting OA that sends the reverse traffic light, and the forward receiving optical path of the OA and the downstream station.
  • the multiplexer and splitter of the two stations are connected by two optical fibers, one of which contains bidirectionally transmitted monitoring channel light and forward traffic light, and the other fiber contains reverse traffic light.
  • the service light is 1550 nm window wavelength light
  • the optical monitoring channel light of the optical monitoring channel unit is 1510 nm wavelength light.
  • the invention supports the method for monitoring the channel optical single-fiber bidirectional transmission.
  • the forward service light After the forward service light is amplified by the forward transmission OA, it enters the upstream site multiplexer unit, and merges with the bidirectional monitoring channel light passing through the optical circulator of the station.
  • a fiber is sent to the downstream site.
  • the service light transmitted to the downstream site is separated by the multiplexing and splitting unit of the station, and is output to the forward receiving OA of the station, and the bidirectional monitoring channel light is separated by the optical circulator by two different directions of light. They are respectively connected to the input port and the output port of the optical monitoring channel unit of the station. Since the service light is transmitted in the same way between the upstream site and the downstream site, only in the opposite direction, the downstream site sends traffic light to the upstream site in the same manner, and the upstream site receives the service light from the downstream site in the same manner.
  • the reception and transmission of the 1510nm wavelength service light are all in the same fiber, and the IEEE1588V2 is completely in the same path, so that there is no asymmetry in the transmission and transmission, and the upstream and downstream sites are ensured.
  • Time synchronization between the two can also have high precision without compensation.
  • the OTN system supporting the monitoring channel optical single-fiber bidirectional transmission adopts a 1+1 protection mode, that is, concurrent selection.
  • This embodiment also includes an upstream station and a downstream station that transmit service light to each other.
  • Each station is internally provided with two OAs and one optical monitoring channel unit, and each station further includes an optical line protection unit (OLP, Optical Fiber Line Auto). Switch Protection Equipment), the optical line protection unit is provided with an multiplexer unit (OSC AD), and the multiplexer unit includes an optical circulator and a multiplexer, and the output of the optical monitoring channel unit is connected to the optical path of the optical port on the optical circulator.
  • OTP optical line protection unit
  • OSC AD multiplexer unit
  • the multiplexer unit includes an optical circulator and a multiplexer, and the output of the optical monitoring channel unit is connected to the optical path of the optical port on the optical circulator.
  • Light circulator The port is connected to the optical path of the multiplexer, and the lower port of the optical circulator is connected to the input optical path of the optical monitoring channel unit; the multiplexer of the upstream station is connected to a coupler, and the multiplexer and the optical path of the downstream station are connected.
  • An optical switch, the coupler and the optical switch are connected by a main line fiber and a spare line fiber.
  • the two optical OAs of the upstream station are divided into a forward transmission OA that transmits forward traffic light, and a reverse reception OA that receives reverse traffic light, and the forward transmission OA is connected to the optical splitter optical path of the station.
  • the two OAs of the downstream station are divided into a forward receiving OA that receives forward traffic light and a reverse transmitting OA that transmits reverse traffic light, and the forward receiving OA is connected to the optical splitter optical path of the station.
  • the upstream site further includes an optical switch, the reverse receiving OA is connected to the optical switch optical path; the downstream station further includes a coupler, and the reverse transmitting OA of the downstream station is connected to the coupler optical path of the station;
  • the optical switch of the upstream site and the coupler of the downstream site are connected by the main and standby line fibers.
  • the optical switch is a 2 ⁇ 2 optical switch controlled by a CPU (not shown) in the optical line protection unit, and each optical switch is connected to an optical power detector, and the coupler is 1: 2 Coupler, the service light is 1550 nm window wavelength light, and the light monitoring channel light is 1510 nm wavelength light.
  • the method for supporting the monitoring channel optical fiber single-fiber bidirectional transmission is: after the forward service light is amplified by the forward transmission OA at the upstream station, and the bidirectional monitoring channel light passing through the station circulator is merged by the multiplexer and the splitter. Incorporate a fiber and output it to the optocoupler for 50:50 splitting and distribution to the forward main and standby line fibers.
  • the unselected one-way light is connected to the optical power detector; the selected one-way optical is connected to the combined splitter to separate the service light from the monitoring channel light, and separated.
  • the business light is output to the optical amplifying unit of the station, and is amplified and output.
  • the separated monitoring channel lights are separated by the circulator, they are respectively sent to the light collecting port and the illuminating port of the optical monitoring channel unit of the station. Since the way to send service light between the upstream site and the downstream site is the same, it is only a square To the contrary, the downstream station sends traffic light to the upstream site in the same manner, and the upstream site receives traffic light from the downstream site in the same manner.
  • the reverse direction service light is amplified by the reverse transmission OA at the downstream station, and then enters the optical line protection unit of the downstream station, and after being split by the 50:50 optical coupler, it is sent to the upstream station through the primary and backup optical fiber lines.
  • the optical switch is selected by the station, and one service light is selected to be amplified by the reverse receiving OA and output to other units, and the other service light enters the optical power detector of the station.
  • the primary and backup line fibers from the upstream site to the downstream site contain 1550 nm service light and 1510 nm monitoring channel light of the two-site protection method, and carry IEEE1588V2 on the 1510 nm wavelength monitoring channel.
  • the primary and backup line fibers from the downstream site to the upstream site only the 1550 nm wavelength optical optical line protection unit (OLP) determines the quality of the optical fiber line based on the optical power performance and completes the switching operation, and also ensures the transmission and reception of 1510 nm wavelength light. Performed in the same fiber.
  • OHP optical optical line protection unit

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Abstract

一种支持监控信道光单纤双向传送的OTN系统及方法，涉及OTN网络领域，包括上游站点和下游站点，每个站点内部均设有两个光放大单元和一个光监控信道单元，每个站点还包括一个合分波单元，合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；两个站点的合分波器通过两根光纤连接，一根光纤中包含双向传送的监控信道光和正向业务光，另一根光纤包含反向业务光。本发明采用带外方式传送IEEE1588V2协议报文，使监控信道光波长的光收发都在一根光纤中，避免了收发路径的不对称，确保了收发的延迟一致性。

Description

一种支持监控信道光单纤双向传送的OTN系统及方法 技术领域
本发明涉及OTN网络领域，具体来讲是一种支持监控信道光单纤双向传送的OTN系统及方法。
背景技术
光网络传输设备作为现代移动通信业务承载网络的同时，也可以通过IEEE1588V2协议的承载实现时间同步信息的地面传送，将时间同步信息由地面的承载设备传送给每个基站，实现高精度的时间同步。随着移动互联网应用的普及，带宽的需求量呈现了快速的增长。具有多波长大容量和电交叉调度灵活性的OTN(Optical Transport Network，光传送网)网络逐步下沉到汇聚或是接入层面使用。IEEE1588V2在OTN网络的传送也越来越的被广泛采用。
由于IEEE1588V2在实现时间同步的机理上，要求传送IEEE1588V2报文在收发路径上的延迟是对称的，而传统的OTN网络一般都是双纤双向方式的网络结构，而且同方向的业务光与监控信道光在同一根光纤中，多数承载业务对收发延迟对称并没有严格要求。所以OTN网络的OTM站点间(中间可能有多个单纯的光放大站点)的收发路径延迟可能存在加大的差异。虽然这中不对称差异可以经过测量后，设置到处理IEEE1588V2的处理单元中进行弥补，但是工程的广泛性和测试的复杂性使得这种方法工程浩大难以进行推广。
OTN网络设备中对IEEE1588V2的承载方式主要有带内(业务 光传送)和带外(监控信道光传送)两种方式。由于带内方式是由业务光波长承载，并且业务光波长在传输路径上采用的是收发不同的光纤，存在收发延迟不对称的问题，在业务的映射复用以及加入FEC的过程中也会出现延迟的变化。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种支持监控信道光单纤双向传送的OTN系统及方法，采用带外方式传送IEEE1588V2的基础，使监控信道光波长的光收发都在一根光纤中，避免了收发路径的不对称，确保了收发的延迟一致性。
为达到以上目的，本发明提供一种支持监控信道光单纤双向传送的OTN系统，包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个光放大单元和一个光监控信道单元，每个站点还包括一个的合分波单元，该合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；两个站点的合分波器通过两根光纤连接，一根光纤中包含双向传送的监控信道光和正向业务光，另一根光纤包含反向业务光。
在上述技术方案的基础上，所述上游站点的两个光放大单元分为发送正向业务光的正向发送放大单元，及接收反向业务光的反向接收放大单元，正向发送放大单元与上游站点的合分波器光路相连；所述下游站点的两个光放大单元分为接收正向业务光的正向接收放大单元，及发送反向业务光的反向发送放大单元，正向接收放大单元与下游站点的合分波器光路相连。
本发明还提供一种基于上述系统的支持监控信道光单纤双向传送的方法，正向业务光放大后进入上游站点合分波单元，与经过本站 点光环形器的双向监控信道光合并后，通过一根光纤发往下游站点；传输至下游站点的业务光由该站点的合分波单元分离出来，输出给该站点中与合分波器相连的一个光放大单元，双向的监控信道光由光环形器分离出两个不同方向的光，分别光路连接到该站点光监控信道单元的输入口和输出口；上游站点按照同样方式接收来自下游站点的业务光。
在上述技术方案的基础上，所述反向业务光经过下游站点中不与合分波器相连的光放大单元放大后，通过一根单独的光纤传输至上游站点的一个光放大单元输出，且该光放大单元不与该站点的合分波器相连。
本发明还提供另外一种支持监控信道光单纤双向传送的OTN系统，包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个光放大单元和一个光监控信道单元，每个站点还包括一个光线路保护单元，光线路保护单元内设有合分波单元，合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；所述上游站点的合分波器连接一个耦合器，下游站点的合分波器连接一个光开关，所述耦合器和光开关通过一条主线路光纤和一条备用线路光纤连接。
在上述技术方案的基础上，所述上游站点的两个光放大单元分为发送正向业务光的正向发送放大单元，及接收反向业务光的反向接收放大单元，正向发送放大单元与该站点的合分波器光路相连；所述下游站点的两个光放大单元分为接收正向业务光的正向接收放大单元，及发送反向业务光的反向发送放大单元，正向接收放大单元与该站点的合分波器光路相连。
在上述技术方案的基础上，所述上游站点还包括一个光开关，反向接收放大单元与所述光开关光路相连；所述下游站点还包括一个耦合器，下游站点的反向发送放大单元与该站点的耦合器光路相连；所述上游站点的光开关和下游站点的耦合器之间通过主、备线路光纤连接。
在上述技术方案的基础上，所述光开关为2×2光开关，所述耦合器为1:2耦合器，所述光开关还连接一个光功率检测器。
本发明还提供一种基于所述系统的支持监控信道光单纤双向传送的方法，正向业务光在放大后与经过环形器的双向监控信道光经过合分波器合并后，输出到光耦合器，分发到正向的主、备线路光纤上；在下游站点，光开关连接一个光功率检测器，主、备线路光经过光开关选择后，一路接到光功率检测器、一路接到合分波器中将业务光与监控信道光分离，分离出的业务光输出到该站点的光放大单元，分离出的监控信道光经环形器后光路连接到该站点的光监控信道单元；所述上游站点按照同样方式接收来自下游站点的业务光。
在上述技术方案的基础上，所述上游站点还包括一个光开关，反向接收放大单元与所述光开关光路相连，光开关还连接一个光功率检测器；所述下游站点还包括一个耦合器，下游站点的反向发送放大单元与该站点的耦合器光路相连；所述上游站点的光开关和下游站点的耦合器之间通过主、备线路光纤连接，所述反方向业务光经过放大后进入下游站点的光耦合器分发到反方向的主、备光纤线路中，到达上游站点后由该站点光开关选择，一路业务光进入该站点光功率检测器，一路输出到该站点的光放大单元。
本发明的有益效果在于：采用了不承载业务信号的光监控通道传送IEEE1588V2，不存在承载方式上引入的延迟变化。通过对传统的 OTN网络设置光环形器，使其成为单纤双向的传送方式，从而避免了业务收发路径的不对称，并且对承载业务的窗口波长没有任何影响。
附图说明
图1为本发明第一实施例业务收发路径对称的单纤双向OTN系统光路图；
图2为本发明第一实施例中上游站点的合分波单元的示意图；
图3为本发明第二实施例业务收发路径对称的单纤双向OTN系统光路图；
图4为图3更详细结构的系统光路图。
具体实施方式
以下结合附图及实施例对本发明作进一步详细说明。
第一实施例：
如图1和图2所示，支持监控信道光单纤双向传送的OTN系统，包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个OA(optical amplifier，光放大单元)和一个光监控信道单元(OSC)，每个站点还包括一个的合分波单元(OSC AD)，所述合分波单元包括一个光环形器和一个合分波器。光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连。所述上游站点的两个OA分为发送正向业务光的正向发送OA，以及接收反向业务光的反向接收OA，正向发送OA与上游站点的合分波器光路相连。所述下游站点的两个OA分为接收正向业务光的正向接收OA，以及发送反向业务光的反向发送OA，正向接收OA与下游站点的合分波器光路 相连。所述两个站点的合分波器通过两根光纤连接，一根光纤中包含双向传送的监控信道光和正向业务光，另一根光纤包含反向业务光。本实施例中业务光为1550nm窗口波长光，光监控信道单元的光监控信道光为1510nm波长光。
本发明支持监控信道光单纤双向传送的方法，正向业务光经由正向发送OA放大后，进入上游站点合分波单元，与经过本站点光环形器的双向监控信道光合并后，通过一根光纤发往下游站点。在下游站点，传输至下游站点的业务光由该站点的合分波单元分离出来，输出给该站点的正向接收OA，双向的监控信道光由光环形器分离出两个不同方向的光，分别连接到该站点光监控信道单元的输入口和输出口。由于上游站点和下游站点之间发送业务光的方式相同，仅仅是方向相反，因此下游站点按照同样的方式向上游站点发送业务光，上游站点按照同样方式接收来自下游站点的业务光。
本实施例中1510nm波长的业务光的收、发均在同一根光纤中，对于承载的IEEE1588V2来说是完全同路径的，这样就不会出现收、发不对称的情况，确保了上下游站点间的时间同步，在没有补偿的情况下也能有很高的精度。
第二实施例：
如图3和图4所示，本实施例中支持监控信道光单纤双向传送的OTN系统采用1+1保护方式，即并发选收。本实施例同样包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个OA和一个光监控信道单元，每个站点还包括一个光线路保护单元(OLP，Optical Fiber Line Auto Switch Protection Equipment)，光线路保护单元内设有合分波单元(OSC AD)，合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共 端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；所述上游站点的合分波器连接一个耦合器，下游站点的合分波器光路相连一个光开关，所述耦合器和光开关通过一条主线路光纤和一条备用线路光纤连接。
所述上游站点的两个光OA分为发送正向业务光的正向发送OA，及接收反向业务光的反向接收OA，正向发送OA与该站点的合分波器光路相连。所述下游站点的两个OA分为接收正向业务光的正向接收OA，及发送反向业务光的反向发送OA，正向接收OA与该站点的合分波器光路相连。
所述上游站点还包括一个光开关，反向接收OA与所述光开关光路相连；所述下游站点还包括一个耦合器，下游站点的反向发送OA与该站点的耦合器光路相连；所述上游站点的光开关和下游站点的耦合器之间通过主、备线路光纤连接。本实施例中，所述光开关为2×2光开关，由所在光线路保护单元内的CPU(图未示)控制，每个光开关连接一个光功率检测器，所述耦合器为1:2耦合器，业务光为1550nm窗口波长光，光监控信道光为1510nm波长光。
本实施例中，支持监控信道光单纤双向传送的方法为：正向业务光在上游站点经过正向发送OA放大后，与经过该站点环形器的双向监控信道光经过合分波器合并，并入一根光纤，再输出到光耦合器进行50:50的分光，分发到正向的主、备线路光纤上。在下游站点，主、备线路光经过光开关选择后，没选中的一路光接到光功率检测器；选中的一路光接到合分波器中将业务光与监控信道光分离，分离出的业务光输出到该站点的光放大单元，放大后输出。分离出的监控信道光经环形器分离后，分别给到该站点的光监控信道单元的收光口和发光口。由于上游站点和下游站点之间发送业务光的方式相同，仅仅是方 向相反，因此下游站点按照同样的方式向上游站点发送业务光，上游站点按照同样方式接收来自下游站点的业务光。
所述反方向业务光在下游站点经过反向发送OA放大后，进入下游站点的光线路保护单元，经过50:50光耦合器分光后，经主、备光纤线路中，并发送至上游站点。到达上游站点后，由该站点光开关选择，选取一路业务光经反向接收OA放大后输出到其它单元，另一路业务光进入该站点光功率检测器。
上游站点到下游站点的主、备线路光纤中，包含有1550nm业务光和两站点护法的1510nm监控信道光，并在1510nm波长监控信道上承载了IEEE1588V2。在下游站点到上游站点的主、备线路光纤中，只有1550nm波长的业务光光线路保护单元(OLP)根据光功率性能判断光纤线路的好坏并完成倒换动作，同时也确保1510nm波长光的收发在同一根光纤中进行。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。

Claims (10)

  1. 一种支持监控信道光单纤双向传送的OTN系统，包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个光放大单元和一个光监控信道单元，其特征在于：每个站点还包括一个的合分波单元，该合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；两个站点的合分波器通过两根光纤连接，一根光纤中包含双向传送的监控信道光和正向业务光，另一根光纤包含反向业务光。
  2. 如权利要求1所述的支持监控信道光单纤双向传送的OTN系统，其特征在于：所述上游站点的两个光放大单元分为发送正向业务光的正向发送放大单元，及接收反向业务光的反向接收放大单元，正向发送放大单元与上游站点的合分波器光路相连；所述下游站点的两个光放大单元分为接收正向业务光的正向接收放大单元，及发送反向业务光的反向发送放大单元，正向接收放大单元与下游站点的合分波器光路相连。
  3. 一种基于权利要求1所述系统的支持监控信道光单纤双向传送的方法，其特征在于：正向业务光放大后进入上游站点合分波单元，与经过本站点光环形器的双向监控信道光合并后，通过一根光纤发往下游站点；传输至下游站点的业务光由该站点的合分波单元分离出来，输出给该站点中与合分波器相连的一个光放大单元，双向的监控信道光由光环形器分离出两个不同方向的光，分别光路连接到该站点光监控信道单元的输入口和输出口；上游站点按照同样方式接收来自下游站点的业务光。
  4. 一种基于权利要求3所述的支持监控信道光单纤双向传送的 方法，其特征在于：所述反向业务光经过下游站点中不与合分波器相连的光放大单元放大后，通过一根单独的光纤传输至上游站点的一个光放大单元输出，且该光放大单元不与该站点的合分波器相连。
  5. 一种支持监控信道光单纤双向传送的OTN系统，包括相互发送业务光的上游站点和下游站点，每个站点内部均设有两个光放大单元和一个光监控信道单元，其特征在于：每个站点还包括一个光线路保护单元，光线路保护单元内设有合分波单元，合分波单元包括光环形器和合分波器，光监控信道单元的输出与光环形器上话口光路相连，光环形器的公共端口与所述合分波器光路相连，光环形器下话口与光监控信道单元的输入光路相连；所述上游站点的合分波器连接一个耦合器，下游站点的合分波器连接一个光开关，所述耦合器和光开关通过一条主线路光纤和一条备用线路光纤连接。
  6. 如权利要求5所述的支持监控信道光单纤双向传送的OTN系统，其特征在于：所述上游站点的两个光放大单元分为发送正向业务光的正向发送放大单元，及接收反向业务光的反向接收放大单元，正向发送放大单元与该站点的合分波器光路相连；所述下游站点的两个光放大单元分为接收正向业务光的正向接收放大单元，及发送反向业务光的反向发送放大单元，正向接收放大单元与该站点的合分波器光路相连。
  7. 如权利要求6所述的支持监控信道光单纤双向传送的OTN系统，其特征在于：所述上游站点还包括一个光开关，反向接收放大单元与所述光开关光路相连；所述下游站点还包括一个耦合器，下游站点的反向发送放大单元与该站点的耦合器光路相连；所述上游站点的光开关和下游站点的耦合器之间通过主、备线路光纤连接。
  8. 如权利要求5、6或7所述的支持监控信道光单纤双向传送的 OTN系统，其特征在于：所述光开关为2×2光开关，所述耦合器为1:2耦合器，所述光开关还连接一个光功率检测器。
  9. 一种基于权利要求5所述系统的支持监控信道光单纤双向传送的方法，其特征在于：正向业务光在放大后与经过环形器的双向监控信道光经过合分波器合并后，输出到光耦合器，分发到正向的主、备线路光纤上；在下游站点，光开关连接一个光功率检测器，主、备线路光经过光开关选择后，一路接到光功率检测器、一路接到合分波器中将业务光与监控信道光分离，分离出的业务光输出到该站点的光放大单元，分离出的监控信道光经环形器后光路连接到该站点的光监控信道单元；所述上游站点按照同样方式接收来自下游站点的业务光。
  10. 一种基于权利要求9所述的支持监控信道光单纤双向传送的方法，其特征在于：所述上游站点还包括一个光开关，反向接收放大单元与所述光开关光路相连，光开关还连接一个光功率检测器；所述下游站点还包括一个耦合器，下游站点的反向发送放大单元与该站点的耦合器光路相连；所述上游站点的光开关和下游站点的耦合器之间通过主、备线路光纤连接，所述反方向业务光经过放大后进入下游站点的光耦合器分发到反方向的主、备光纤线路中，到达上游站点后由该站点光开关选择，一路业务光进入该站点光功率检测器，一路输出到该站点的光放大单元。
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