Patent ID: 6331908
Filing Date: 2001-12-18
Classification: H04B

Abstract:
An optical system comprisingan optical fiber which tends to generate SBS in response to a laser signal,an integrated optical circuit for generating a modulated, tunable semiconductor laser output signal coupled to said fiber, said circuit including, arranged in tandem, a tunable laser source for generating said output signal and a semiconductor modulator for impressing information on said output signal, said laser source including a cavity resonator formed by a DFB gain section for generating said laser signal at a given center wavelength and a composite reflector for altering the phase of the laser signal within said resonator, a tuning source for applying a tuning voltage to said composite reflector to alter said phase and hence the center wavelength of said output signal, and a dither source for applying to said composite reflector a dither signal for broadening the spectrum of said output signal, thereby to increase the threshold for SBS in said fiber.