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OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission

A single-fiber two-way, optical monitoring channel technology, applied in the field of OTN network, can solve the problems of delay variation, asymmetry of sending and receiving delays, etc., and achieve the effect of avoiding asymmetry

Active Publication Date: 2014-06-04
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the in-band mode is carried by the service optical wavelength, and the service optical wavelength uses different optical fibers for sending and receiving on the transmission path, there is a problem of asymmetric sending and receiving delay, which will also occur in the process of service mapping and multiplexing and adding FEC Latency Variation

Method used

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  • OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission
  • OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission
  • OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission

Examples

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no. 1 example

[0023] Such as figure 1 and figure 2 As shown, the OTN system that supports bidirectional transmission of optical single fiber of the monitoring channel includes upstream sites and downstream sites that transmit service light to each other. Each site is equipped with two OAs (optical amplifiers, optical amplification units) and an optical monitoring channel. Each site also includes a multiplexer / demultiplexer unit (OSC AD), and the multiplexer / demultiplexer unit includes an optical circulator and a multiplexer / demultiplexer. The output of the optical monitoring channel unit is connected to the optical path of the upper port of the optical circulator, the common port of the optical circulator is connected to the optical path of the multiplexer / demultiplexer, and the lower port of the optical circulator is connected to the input optical path of the optical monitoring channel unit. The two OAs at the upstream site are divided into a forward sending OA for sending forward servic...

no. 2 example

[0027] Such as image 3 and Figure 4As shown, in this embodiment, the OTN system supporting the bidirectional transmission of the supervisory channel optical single fiber adopts the 1+1 protection mode, that is, concurrent selective reception. This embodiment also includes upstream sites and downstream sites that transmit service light to each other. Each site is internally equipped with two OAs and an optical monitoring channel unit, and each site also includes an optical line protection unit (OLP, Optical Fiber Line Auto Switch Protection Equipment), the optical line protection unit is equipped with a multiplexer / demultiplexer unit (OSC AD). The multiplexer / demultiplexer unit includes an optical circulator and a multiplexer / demultiplexer. The common port of the optical circulator is connected with the optical path of the multiplexer / demultiplexer, and the lower port of the optical circulator is connected with the input optical path of the optical monitoring channel unit; ...

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Abstract

The invention discloses an OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission and relates to the field of OTN networks. The system comprises an upstream station and a downstream station, two optical amplifier units and one optical supervisory channel unit are arranged inside each station, and each station further comprises a wave combining and separating unit. Each wave combining and dividing unit comprises an optical circulator and a wave combining and separating device, and output of the optical supervisory channel units is connected with upper movable joint optical paths on the optical circulators, and public ports of the optical circulators are connected with optical paths of the wave combining and spearing device. Lower movable joints of the optical circulators are connected with input optical paths of the optical supervisory channel units, the wave combining and separating devices of the two stations are connected through two optical fibers, one optical fiber comprises supervisory channel light in bidirectional transmission and forward-direction service light in bidirectional transmission, and the other optical fiber comprises backward-direction service light. An out-of-band mode is adopted for transmitting an IEEE1588V2 protocol message, so that light with long light waves in the supervisory channel is received and transmitted in the same optical fiber, it is avoided that receiving and transmitting paths are not symmetrical, and uniformity of receiving and transmitting delay is guaranteed.

Description

technical field [0001] The invention relates to the field of OTN networks, in particular to an OTN system and method for supporting monitoring channel optical single-fiber bidirectional transmission. Background technique [0002] While the optical network transmission equipment is used as a modern mobile communication service bearer network, it 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. . With the popularization of mobile Internet applications, the demand for bandwidth has shown a rapid growth. The OTN (Optical Transport Network, Optical Transport Network) network with multi-wavelength large capacity and electrical cross-scheduling flexibility is gradually sinking to the aggregation or access layer. The transmission of IEEE1588V2 in the OTN net...

Claims

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Application Information

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IPC IPC(8): H04J14/02H04B10/038
CPCH04B10/0773
Inventor 梅亮李健源曹云刘中华廖原柴焦
Owner FENGHUO COMM SCI & TECH CO LTD
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