Optical communications systems using raman repeaters and components therefore

Abstract From the Canadian patent

An optical fiber communication system for transmitting information-bearing optical signals over an optical fiber transmission line includes a signal generator coupled to the transmission line for introducing information-bearing optical signals thereonto preferably, as wavelength modulated signals and one or more optical, amplifiers for periodically collectively amplifying the, transmitted signals to overcome the effects of attenuation. Wavelength modulation is achieved by altering the resonant characteristics of an optical resonator opti-, cally coupled to a gain medium so as to provide an output that varies between a first and second wavelength. The optical amplification is achieved by …