Patent ID: 6091542
Filing Date: 2000-07-18
Classification: H01S,H04B

Abstract:
An optical amplifier for amplifying signal lights propagating in two opposite directions, the optical amplifier comprising:a first and a second transmitters for generating a first and a second signal lights, respectively;a first and a second receivers for receiving the first and the second signal lights, respectively;a fiber amplifier for amplifying the first and the second signal lights;a first optical device including a first and a second wavelength division multiplexing(WDM) couplers, a first and a second isolators, wherein the first WDM coupler selectively transmits the first signal light from the first transmitter to the fiber amplifier via the first isolator and the second WDM coupler, and the second WDM coupler selectively transmits the second signal light from the second transmitter to the second receiver via the second isolator and the first WDM coupler;a second optical device including a third and a fourth WDM couplers, a third and a fourth isolators, wherein the third WDM coupler selectively transmits the first signal light from the fiber amplifier to the first receiver via the third isolator and the fourth WDM coupler, and the fourth WDM coupler selectively transmits the second signal light from the second transmitter to the fiber amplifier via the fourth isolator and the third WDM coupler; andmeans for pumping the fiber amplifier.