Patent ID: 7126747

Claim:
A hybrid optical amplifier coupling a Raman fiber amplifier and a semiconductor optical amplifier, comprising: a laser diode generating and radiating a laser light for a Raman optical amplification; a wavelength division multiplexer passing an incident signal light and radiating the laser light radiated from the laser diode in a reverse direction of the incident signal light; and a gain clamped semiconductor optical amplifier amplifying an optical signal radiated from the wavelength division multiplexer; a dispersion compensated fiber coupled to at least one of a rear portion of the wavelength division multiplexer and a front portion of the wavelength division multiplexer to compensate an accumulated chromatic dispersion of an optical signal; and a Raman amplifying means coupled to at least one of a rear portion of the dispersion compensated fiber and a front portion of the dispersion compensated fiber.