System and method for preventing from loop self-excited optical ring network channel sharing protection

Abstract

The invention discloses a shared protection system and a method of an optical ring network path, which avoids a loop circuit self-excitation, concerning a system and a method which avoid the self-excitation in an annular network of optical transmission and designed for solving the problem that the prior self-excitation restraining method lowers the signal-to-noise ratio or the operation agility is not good. The system of the shared protection of the optical ring network path, which avoids the loop circuit self-excitation, adds a vibration damper to a protection trail and changes the protection trail by the damping estate and the through estate of the vibration damper, which stops the protection trail from being closed. The shared protection method of the optical ring network path, which avoids the loop circuit self-excitation, includes that: (1). an amplifier conducts the real-time detection of the line status information of the system and transmits the information to a switching control unit of automatic protection. (2). the switching control unit of automatic protection controls the vibration damper to be switched between the damping estate and the through estate according to the line status information. The invention is mainly used in the shared protection system of two-fiber bidirectional path to protect the switching and effectively avoid the loop circuit self-excitation.

Description

technical field [0001] The invention relates to an optical transmission ring network, in particular to a system and method for avoiding loop self-excitation in the optical transmission ring network. Background technique [0002] In Dense Wavelength Division Multiplexing (DWDM: Dense Wavelength Division Multiplexing) optical transmission system, ring network is a common communication network topology. Compared with other structures, ring network is easier to implement while maintaining high survivability. and management, so it is widely used in urban optical transport networks. The DWDM ring network retains the self-healing characteristics of the ring structure and has a variety of protection methods. Due to the use of the ring network for protection and the transparency of the transmission link, under certain conditions, it will Form a special optical path—a closed all-optical transparent loop. When the total gain of the loop is greater than the total loss, lasing will be f...

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Problems solved by technology

However, this method reduces the flexibility of the system to operate

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