Two periodically bending non-linear optical waveguide coupled all-optical switch

Abstract

The invention provides a full optical switch which is made by coupling two cycle-bending nonlinear light wave guides. The full optical switch comprises two light wave guides arranged in parallel, which are bent by a synchronous cycle along the propagation direction of light and whose lengths are equal to one another and are odd multiples of the coupling length. The full optical switch bends the cycles of the two parallel light wave guides along the propagation direction of the light. Since the bending of the cycles of the wave guides is equivalent to the increase of nonlinearity of a coupler, a switch threshold value can be greatly reduced. The critical power of the switch of the bent light wave guide coupler mainly depends on the bending strength and the bending cycles of the wave guides. And the improved full optical switch has the advantages of remarkably improved contrast and higher sensitivity of the switch threshold value; in addition, the improved full optical switch overcomes the shortcomings of a full optical switch based on a traditional light wave guide coupler, such as progressive operation and incompletion.

Description

technical field [0001] The invention relates to an all-optical switch based on a nonlinear optical waveguide coupler, belonging to the field of optical technology. Background technique [0002] The all-optical switch eliminates the optical / electrical and electrical / optical conversion process of the electrical switch, and is a key device for future optical communication networks. [0003] People can take advantage of the nonlinear characteristics of fiber couplers to realize all-optical switches. The literature (Appl.phys.lett.51, 1135 (1987)) reported the use of a nonlinear fiber coupler to realize an all-optical switch with sub-picosecond speed. They fabricated 2-meter-long single-mode nonlinear dual-core fibers (ie, optical waveguides) with cores 5 microns in diameter and spaced 8 microns apart. The refractive index difference between the core and the cladding is 0.0054, and the fiber is made of quartz. A laser beam is incident on one core of the fiber coupler. When th...

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an all-optical switch that does not need to use a material with a large nonlinear refractive index but can still reduce the switching threshold, so as to overcome the gradual and unstable problems existing in the existing all-optical switch. complete flaw

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