Patent ID: 6486991
Filing Date: 2002-11-26
Classification: H04B,H04J

Abstract:
An optical transmission system having an optical surge suppression function, comprising:optical amplifiers for amplifying input signal light directly; and dummy light output means for inputting dummy light different from the signal light into said optical amplifiers, wherein each of said optical amplifiers comprises: a rare earth element doped optical fiber for amplifying input signal light to output the amplified signal light; a pumping light source for outputting pumping light; a first optical wavelength multiplexer for inputting the pumping light to said rare earth element doped optical fiber; an optical branching device for branching part of the amplified signal light to output the branched signal light; and pumping light control means for controlling the output of the pumping light based on the output level of the branched light, wherein said dummy light output means comprises: a dummy light output source for outputting dummy light; and a second optical wavelength multiplexer for inputting the dummy light into said rare earth element doped optical fiber, wherein the dummy light signal includes a self-oscillating clock.