Patent ID: 6246515
Filing Date: 2001-06-12
Classification: H01S

Abstract:
An optical fiber amplifier for amplifying an optical transmission signal having a wavelength of .lambda..sub.t, comprising:a rare earth doped optical fiber having an input end and an output end;a first pump laser for generating a first pump light having a wavelength of .lambda..sub.1 ;a first multiplexer having a first input port, a second input port, and an output port, said first input port being adapted to receive said optical transmission signal, said second input port being optically connected to said first pump laser;a multiplexer/demultiplexer having a first input port, a second input port, a first output port, and a second output port, said first input port being optically connected to said output port of said first multiplexer, said second output port of said multiplexer/demultiplexer being optically connected to said input end of said rare earth doped optical fiber;an optical isolator having a first end and a second end, said first end of said optical isolator being optically connected to said first output port of said multiplexer/demultiplexer;a second pump laser for generating a second pump light having a wavelength of .lambda..sub.2 ; anda second multiplexer having a first input port, a second input port, and an output port, said first input port being optically connected to said second end of said optical isolator, said second input port being optically connected to said second pump laser, said output port being optically connected to said second input port of said multiplexer/demultiplexer.