Patent ID: 6658211
Filing Date: 2003-12-02
Classification: H01S,H04B,H04J

Abstract:
An optical signal repeater, which is used at an optical fiber transmission system provided with an optical transmission line, an optical transmitter, and an optical receiver, comprising:an optical signal amplifying means for amplifying wavelength division multiplexed (WDM) optical signals transmitted from said optical signal transmitter via said optical fiber transmission line; a pumping light source which outputs pumping light used for amplifying said WDM optical signals; an optical signal multiplexer which transmits said pumping light to said optical signal amplifying means; an optical splitter which splits said amplified WDM optical signals into two parts; a wavelength selection type reflection means which reflects only on optical signal having a specified wavelength in one part of said amplified WDM optical signals split at said optical splitter; an automatic level controller to which said optical signal having the specified wavelength is inputted and which controls said pumping light output from said pumping light source so that the power level of said optical signal having the specified wavelength reflected from said wavelength selection type reflection means becomes a designated level; and a reflected optical signal transmitting means which transmits said optical signal having the specified wavelength reflected at said wavelength selection type reflection means to said automatic output level controller.