Patent ID: 7158288
Filing Date: 2007-01-02
Classification: H01S,H04B

Abstract:
1. An optical amplifier comprising: a pump light source which outputs pump light; a wavelength division multiplexer which multiplexes an input signal with the pump light; an optical fiber which amplifies the input signal using the pump light; a reflecting mirror; and a C/L-band coupler which comprises a C-band port and an L-band port, wherein a C-band signal passes through the C-band port and an L-band signal passes through the L-band port, the L-band port being connected to the input signal, the C-band port being connected to the reflecting mirror, wherein backward amplified spontaneous emission (ASE) generated by the optical fiber travels to the reflecting mirror via the C/L-band coupler and is then reflected by the reflecting mirror to be re-injected to the optical fiber.