BEAT FREQUENCIES OF UP TO 16 THZ GENERATED VIA MODULATION INSTABILITYIN BIREFRINGENT FIBERS

Modulation instability can occur in the normal dispersion regime only via cross-phase modulation. In a high birefringence fiber, cross-phase modulation between the pump waves on the two principal axes of the fi ber generates two modulation instability sidebands separated by a freq uency which is primarily determined by the birefringence and dispersio n of the fiber, with a secondary dependence on the pump power. The sup erposition of these sidebands can generate an amplitude modulated puls e with modulation frequencies of up to 16 THz.