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

A nonlinear optical waveguide and all-optical switch technology, applied in the field of optics, can solve the problems of incompleteness and asymptoticity of all-optical switches, and achieve the effects of overcoming asymmetry and incompleteness, improving contrast, and lowering the threshold

Inactive Publication Date: 2008-07-09
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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

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Embodiment 1

[0019] Referring to FIG. 2 , the all-optical switch provided by the present invention is formed by coupling two identical periodically curved optical waveguides placed in parallel. The shape of the waveguide bent along the propagation direction z direction can be any periodic function

[0020] x 0 ( z ) = Σ n = 1 n = N [ A n cos ( nωz ) + B n sin ( nωz ) ] .

[0021] In the x direction due to the substrate refractive index n s Different from the refractive index of the optical waveguide, since it is a dual-core optical wavegu...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/365
Inventor 吴飙罗小兵谢琼涛
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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