Patent ID: 6053640
Filing Date: 2000-04-25
Classification: G02B,H01S

Abstract:
An integrated module for an optical fiber amplifier having a signal light input portion, a signal light output portion and a substrate; comprising;a signal light channel for directing signal light from the signal light input portion to the signal light output portion via the substrate;a WDM filter component for allowing signal light to pass therethrough and for reflecting pumping light, said WDM filter component being disposed and fixed to at least a portion of the signal light channel on said substrate;a laser diode element for guiding pumping light to the WDM filter component disposed and fixed via a base and a Peltier element at locations other than the signal light channel on the substrate by brazing or soldering; andwhereina location at which the Peltier element is fixed to a high thermal conductivity portion of the substrate is constructed of Cu or Cu-W based alloy; andat least a portion of said base includes a low thermal conductivity portion constructed of Fe-Ni-Co based alloy, Fe-Ni based alloy, Fe-Ni-Cr based alloy, Fe-Cr based alloy or stainless steel, and said WDM filter component is fixed to the low thermal conductivity portion of the same base, at which said laser diode element is secured, by laser beam welding.