Method and apparatus for optical logic and switching functions

Details Method and apparatus for optical logic and switching functions Method and apparatus for optical logic and switching functions

1995-12-22

1997-02-04

Hellner, Mark

Optical: systems and elements

Optical modulator

359108, 359124, 341137, 385 16, G02B 2600, G02B 626, G02F 300

Patent

active

056004796

ABSTRACT:
Intrapulse Raman scattering is utilized in providing optical devices that can be adapted to perform various logic and switching functions. In a logic gate embodiment of the present invention, a plurality of pulses of the same central wavelength are coupled to produce an output pulse having a power level equal to the sum power level of the inputs. When the power level of a sufficiently narrow output pulse exceeds the Raman threshold, the output pulse experiences a wavelength shift of a magnitude that can be controlled by adjusting the input power. An optical filter selectively blocks coupler output pulses depending on the desired logical operation of the device. In a switch according to the invention, an input pulse and a control pulse are coupled, and Raman scattering of the output pulse is stimulated. The output pulse is applied to several output lines, each having a filter centered at a predetermined pass band. The input pulse is thereby passed to a selected output line or lines depending on the magnitude of the control pulse.

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Electronics Letter, 9th May 1991; vol. 27 No. 10 Optical Intensity Dependent Switching Using Soliton Self-Frequency Shift.

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