  The universal optical logic gates, namely NAND and NOR gates, have been
theoretically simulated by employing the energy sharing collision of bright
optical solitons in the Manakov system, governing pulse propagation in a highly
birefringent fiber. Further, we also realize the two input optical logic gates
such as AND, OR, XOR, XNOR for completeness of our scheme. Interestingly, our
idea behind the simulation naturally satisfies all the criteria for practical
optical logic which in turn displays the strength and versatility of our
theoretical simulation of universal optical logic gates. Hence, our approach
paves the way for the experimentalists to create a new avenue in this direction
if the energy sharing collisions of Manakov solitons are experimentally
realized in the future.
