Patent ID: 7012741
Filing Date: 2006-03-14
Classification: H01S

Abstract:
1. A wideband amplifier for use in a wavelength division multiplexing optical communication system that at least one of transmits and receives wavelength-division-multiplexed optical signals through at least one optical fiber, comprising: at least one erbium-doped fiber, pumped by a first pump light that pumps erbium ions and a second pump light that induces a Raman amplification, such that the at least one erbium-doped fiber amplifies the optical signals; a first pumping light source that outputs a predetermined wavelength of the first pump light such that the erbium ions are pumped from the erbium-doped fiber; a first wavelength selective coupler that passes through optical signals amplified by the erbium-doped fiber and that inputs the first pump light into the erbium-doped fiber; a second pumping light source that outputs a predetermined wavelength of the second pump light such that a Raman pumping is performed of the erbium-doped fiber; and a second wavelength selective coupler that passes through optical signals amplified by the erbium-doped fiber and that inputs the second pump light into the erbium-doped fiber.