CONTROL METHOD OF OPTICAL BRANCHING AND INSERTING SWITCH

摘要

PROBLEM TO BE SOLVED: To provide a control method of an optical branching and inserting switch in a wavelength division multiple communication system, wherein occurrence of an optical surge is prevented during a transition operation so as to avoid erroneous discrimination.

SOLUTION: In the control method of the optical branching and inserting switch, the switch transits to a shut-down mode wherein an attenuation of a variable optical attenuator of the optical branching and inserting switch is fixed to a prescribed value after an optical power of each wavelength path included in a wavelength multiple signal light outputted from a node reaches a shut-down level or below and the state of the shut-down level or below is consecutive for a first time interval Ts or over, and the switch transits to an active mode wherein the attenuation of the variable optical attenuator is controlled after the optical power of the wavelength path reaches an activate level or over and a state of the activate level or over is consecutive for a second time interval Ts or over.

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