Patent ID: 7599406

Claim:
A fiber ring laser, comprising: an optic amplifier, for amplifying a first laser beam with a specified wavelength range; a first optical coupler (OCP); a second OCP; a first fiber ring, coupled to the optic amplifier, the first OCP and the second OCP, for receiving the first laser beam and providing a first resonant cavity; a second fiber ring, coupled to the first OCP and the second OCP, for providing a second resonant cavity; a first polarization controller (PC), coupled to the first fiber ring, for controlling a polarization state of the first resonant cavity; a second PC, coupled to the second fiber ring, for controlling a polarization state of the second resonant cavity; wherein the first laser beam resonates in the first resonant cavity and second resonant cavity to generate a second laser beam with a first wavelength and a second wavelength.