Patent ID: 7315696
Filing Date: 2008-01-01
Classification: H04B

Abstract:
1. In a network constituted with a multi-stage connection of a plurality of wavelength division multiplex (WDM) transmission equipment, each having a receiving amplifier amplifying a WDM signal received from a preceding station, and a transmitting amplifier outputting a WDM signal to a succeeding station, a gain setting method for the receiving amplifier comprising: detecting the necessity of gain setting of the receiving amplifier when the power of the receiving amplifier is turned on, requesting WDM transmission equipment in a preceding station to output ASE light; in the WDM transmission equipment of the preceding station, based on the request for ASE light output, shutting off both passing-through light and added light, and outputting the ASE light corresponding to a predetermined number of wavelengths of signal light; in the receiving amplifier of the WDM transmission equipment in a station of interest, performing the gain setting by use of the ASE light; and on completion of the gain setting, the WDM transmission equipment of the station of interest requests the WDM transmission equipment of the preceding station to halt the ASE light output, and the WDM transmission equipment of the preceding station halts the ASE light output upon receiving the request and switches the output to an optical signal output.