Patent ID: 6606178
Filing Date: 2003-08-12
Classification: H04B,H04J

Abstract:
An optical transmitter for use in an optical transmission network having a long fiber waveguide through which a plurality of wavelength division multiplexed signals are transmitted, said transmitter comprising:a plurality of sources of modulated optical signals each having a different wavelength; a multiplexer coupled to each of said sources for receiving the modulated optical signals and transmitting the optical signals over said long fiber waveguide; a phase modulator for modulating the phase of the optical signals propagating through the long fiber waveguide; and an optical amplifier for amplifying the phase-modulated optical signals as the optical signals propagate through the long fiber waveguide, wherein said phase modulator modulates the optical signals at a frequency that causes destructive interference of four wave mixing cross-talk products generated along the length of the long fiber waveguide.