Patent ID: 6441952
Filing Date: 2002-08-27
Classification: H01S

Abstract:
A hybrid Raman and Erbium-Doped Fiber Optical Amplifier comprising:an Erbium-Doped Fiber Amplifier (EDFA); an output fiber optically coupled to an output of the EDFA; a Wavelength Division Multiplexer (WDM) coupler optically coupled to an input of the EDFA and outputting an optical signal to the EDFA; an input fiber optically coupled to the WDM for inputting the optical signal to the WDM and for receiving a Raman pump laser light from the WDM; a first optical tap optically coupled between the EDFA and the WDM; a first monitor detector optically coupled to the first optical tap; an electronic amplifier electrically coupled to the first monitor detector; at least one Raman pump laser optically coupled to the WDM emitting the Raman pump laser light; a second optical tap optically coupled between the at least one Raman pump laser and the WDM; a second monitor detector optically coupled to the second optical tap; an electronic subtract circuit electrically coupled to the second monitor detector and the electronic amplifier; and an EDFA control circuit electrically coupled to the electronic subtract circuit and to the EDFA, wherein the electronic subtract circuit outputs an electronic signal to the EDFA control circuit that is proportional to a power of the optical signal and insensitive to a power of the Raman pump laser light, wherein the EDFA control circuit adjusts an operation of the EDFA based upon the power of the optical signal.