System for transmitting single-fiber two-way wavelength division multiplexing and its protection method

Abstract

A single fiber bi-directional WDM transmission system and a protection method thereof are disclosed. The system includes a laser, a receiver, a splitter-combiner and a multiplexing segment protection device, and further includes a laser controller connected the first laser and one or more first receiver among receivers, it is used to close up the first laser when the fiber in work line or protection line of the multiplexing segment protection device is broken, and used to restart the first laser after the switch of lines by the multiplexing segment protection device; the light emitted by the first laser can be reflected back to the light detector when the fiber in work line or protection line is broken. In the present invention, when the fiber in work line or protection line is broken, parts of lasers can be closed up by the laser controller, the influence to the multiplexing segment protection device from the reflected light can be eliminated; and after the switch finished, the laser can be opened up and the communication can be resumed, so that the multiplexing segment protection in the single fiber bi-directional system can be realized expediently.

Description

technical field [0001] The invention relates to a device for realizing a WDM (Wavelength Division Multiplexing, wavelength division multiplexing) transmission system and control method of a single-fiber bidirectional non-optical amplifier for multiplexing section protection, which is mainly used in the field of optical transmission. Background technique [0002] Traditional WDM transmission uses a pair of optical fibers to complete two-way communication. Each optical fiber carries a considerable amount of light waves to achieve high-capacity transmission. This kind of transmission mode generally carries a pair of services on the same wavelength in both directions, and the two communicating parties use the same wavelength for communication. In order to ensure the reliability of communication and prevent service interruption caused by fiber damage, protection devices are applied to the system. For point-to-point and ring communication, we can use the 1+1 multiplex section pr...

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Problems solved by technology

[0015] In order to solve the problem that the switching of the working line and the protection line cannot be performed normally due to the existence of reflected light in the existing system, the purpose of the present invention is to provide a single-fiber bidirectional wavelength division multiplexing transmission system and its protection method, so that the single-fiber When the optical fiber of the working line or the protection line is broken, the two-way wavelength division multiplexing transmission system can realize the switching of the line in time and realize effective protection for the communication

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