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.