Patent ID: 6031646
Filing Date: 2000-02-29
Classification: H01S,H04B

Abstract:
An optical fiber telecommunication system comprising:a transmission station producing at least one transmission optical signal in a predetermined wavelength band carrying the information;a receiving station for receiving said transmission optical signal;an optical fiber line connecting said transmission station and said receiving station, andat least one optical fiber amplifier connected along said line for amplifying said transmission optical signal, said amplifier having a first stage and a second stage connected by an optical isolator, in which said second stage comprises:an erbium doped fiber;pump means comprising two pump sources having two different wavelengths in a first pump wavelength band in the range of 1450-1500 nm;a WDM coupling means coupling said different wavelengths as a composite first pump signal;a coupler coupling said composite first pump signal and said transmission optical signal to said erbium doped fiber.