Huawei Technologies Co., Limited

Dianjun Xiao

Weishi Li

Jun Luo

Tianhai Chang

Qianjin Xiong

Naisheng Zhang

Yuzhi Jin

Yanming Liu

Youdao Xue

Wenbin Luo

Shiyin Zhang

The present invention discloses a WDM layer-based OChP device and the method thereof, i.e., M protection channels are added in the transmitting module and the receiving module to connect to receiving ends and transmitting ends of M protection channels in the WDM system; a switching device is added so as to switch signals in specified working channels to specified protection channels or switch signals transmitted in specified protection channels back to specified working channels according to switching requests from the WDM system; wherein M and N are natural numbers, and M&#x3c;N. Because the number M of protection channels is less than the number N of the working channels, compared with 1+1 or 1:1 protection solution, this solution helps to save optical wavelength resource and initial cost. In addition, compared with 1+1 or 1:1 protection solution, when M&#x3e;1, this solution can significantly reduce the risk of ruined backup performance due to above failures, without requiring increased cost.

WDM layer-based optical chanel protecting device and method thereof

The present invention discloses an optical communication system, a sub-rate multiplexing/de-multiplexing apparatus and the method thereof such that the optical communication system could meet the demand of Metropolitan Area Network (MAN) communications using the existing optical fiber network. This optical communication system includes an optical transmitting module and an optical receiving module connected by optical fibers, wherein the optical transmitting module is used for converting the inputted electrical signals into optical signals and transferring the optical signals to the optical receiving module via optical fibers, and the optical receiving module is used for converting the received optical signals into electrical signals and outputting the electrical signals. In the optical signals transferred by optical fibers, the data transmission rate of at least one wavelength is about 5 Gb/s. One or multiple optical amplifiers may be incorporated as well between the optical transmitting module and the optical receiving module.

Method, apparatus and system for optical communications

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Dianjun Xiao