System of dual fibers two-way channel/multiplexing segment rotating loop for wavelength division multiplexing optical network

Abstract

The device includes following parts. The protection switches of 4 multiplexing segments are utilized to change optical fiber line. Two pair of wavelength division multiplexer / wavelength demultiplexer combines multiple optical signals with different wavelengthes onto one optical fiber; or separates the optical signals, which is combined from multiple different wavelengthes. N pieces of matrices with 4 in and 4 out of the optical switches are utilized to change the propagation direction or protect the channel needed. 2n pieces of optical power equalizers are used to balance the power of the optical signals. 2n+2 pieces of monitors are used to monitor and detect faults. The invention provides the flexible protection for channel faults, line faults and node device fault.

Description

(1) Technical field [0001] The present invention relates to a kind of BPSR (dual-fiber bidirectional path switching ring) / BLSR (dual-fiber bidirectional multiplexing section switching ring) network system used in wavelength division multiplexing optical network, more specifically, relates to a kind of used in wavelength division multiplexing Use OADM (Optical Add-Drop Multiplexing Device) ring network dual-fiber bidirectional channel / multiplex section to switch the ring network system. (2) Background technology [0002] With the development of technology and the sharp increase in the demand for communication capacity, WDM (Wavelength Division Multiplexing) transmission technology has become an important and commonly used solution from the long-distance backbone network to the core network of the metropolitan area network. The WDM network bears a large amount of business (for example, the capacity of an 80Gb / s system is equivalent to 1 million telephone lines, and the Tb / s le...

AI Technical Summary

Problems solved by technology

At present, the protection methods in the self-healing ring network are: 1. Dual-fiber unidirectional channel switching ring (UPSR), which still has the disadvantages of low wavelength utilization and small working capacity; 2. Dual-fiber unidirectional multiplex section switching ring (ULSR), this solution can only provide line protection and has low wavelength utilization and small working capacity, so it is rarely used; 3. Dual-fiber bidirectional multiplex section switching ring (BLSR), can only provide protection against fiber failures and node equipment failures It cannot provide protection against signal failure of a single channel, that is, a single wavelength or a small number of wavelengths, as disclosed in the patent No. 1258969 / 99118615. technology, the essence is a four-fiber BLSR formed by two ULSR rings, so the cost is high; and as the patent No. is 1170485 / 95196920. technology, which gives a way to deal with the protection of fiber failures and node equipment failures, but still cannot provide protection for single channels

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