Implementation of Polarization-Conversion in Ring-Resonator and its Application to Design All-Optical NOT Logic Gate

All-optical NOT logic gate is theoretically described using the concept of polarization-conversion in ring resonator. Conversion of polarization states occurs at very high speed of 0.2 ps and high Q-factor of about 1500 is obtained. The design may used in intensity based all-optical switching as well as in designing of all-optical logic gates. Low pump power of about 40 nW/ m is required for such conversion based all-optical gates. Suitability in pumping, refractive index contrast, height-to-width ratio of waveguide and phase-matching condition is necessary to obtain such results.