All-optical NAND/NOT/AND/OR logic gates based on combined brillouin gain and loss in an optical fiber

摘要

A combined Brillouin gain and loss process has been created in a polarization maintaining optical fiber to realize all-Optical NAND/NOT/AND/OR logic gates in the frequency domain. A model describing the interaction of a Stokes, anti-Stokes and continuous wave, and two acoustic waves inside a fiber, ranging in length from 350 m-2300 m, was used to theoretically model the gates. Through the optimization of the gain and loss process, switching contrasts of 20-88% have been achieved, under different configurations. Experimental setups for NAND/NOT/AND/OR optical logic gates have been described. A method and system for designing the all-optical logic gates have been also provided.

主权项

1. An optical logic gate, comprising:
an optical fiber; a reference laser source, injecting a reference signal into one end of the optical fiber; an input laser source, injecting an input signal into an opposite end of the optical fiber, such that the reference signal and the input signal counter-propagate in the optical fiber and are selected so that to cause stimulated Brillouin scattering in the optical fiber; an output signal, exiting the opposite end of the optical fiber, the output signal being created by the interaction of the reference signal and the input signal; and a length of the optical fiber, an input power of the reference signal, and a low power and a high power of the input signal, wherein the low power is lower than the high power, being selected so that: the low power of the input signal yields the power of the output signal above a high threshold; and the high power of the input signal yields a power of output signal below a low threshold, wherein the low threshold is lower than the high threshold.