Optical gates where output signal intensity is independent of ph

Details Optical gates where output signal intensity is independent of ph Optical gates where output signal intensity is independent of ph

1992-12-11

1995-09-05

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling function

359332, 385 1, 385 14, 385122, G02B 614

Patent

active

054486645

ABSTRACT:
A method for amplifying optical signals without dependence of output signal intensity on an input-signal phase is provided. This method is based on nonlinear interaction of three phase-synchronized modes in one core of a waveguide. The method may be realized by passing the above-mentioned signals through an optical element with a waveguide (200) having pulse interaction and propagation portions (205 and 207) which receive impulses in first and second coherent waveguide modes which cause a nonlinear interaction between the first and second waveguide modes and generate a third waveguide mode. This third mode is phase-synchronized with the first and second waveguide modes. The method may be realized in optical amplifiers, switches, as well as logical optical AND gates, OR gates, etc. An optical OR gate which realizes the above principle consists of an input portion (201), a core expansion portion (202) which in addition to the first waveguide mode allows the appearance of a second waveguide mode and a third waveguide mode, a linear mode conversion portion (203), an input impulse portion (204), a first nonlinear interaction and propagation portion (205), a third-mode elimination portion (206), a second nonlinear interaction and propagation portion (207), and an output portion (208, 209) which produces an amplified impulse in a first waveguide mode. Logical AND gate also is described. The elements can be represented in the fiber-optic or integrated-optic version.

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M. Zuev & A. Shvartsburg, "Quasi-dynamic modelling for non-linear evolution of short pulses", 7 Computer Optic (Moscow) 72-81 (1990). (No Month), (No Translation).

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