Asymmetric optical loop mirror exhibiting threshold discriminati

Details Asymmetric optical loop mirror exhibiting threshold discriminati Asymmetric optical loop mirror exhibiting threshold discriminati

1996-12-26

1999-06-29

Bovernick, Rodney

Optical waveguides

Having nonlinear property

359115, G02B 626

Patent

active

059179791

ABSTRACT:
An optical signal amplitude discriminator incorporating the invention includes an optical loop having a nonlinear optical amplifier positioned a distance .DELTA.x from the loop's midpoint. The nonlinear optical amplifier is responsive to an applied optical saturating signal to exhibit an altered index of refraction which persists for a limited duration and induces a phase shift in an applied optical signal propagating therethrough. An input source applies both data and clock pulses to an unbalanced coupler, with the clock pulses having an input energy that is greater than the saturation level of the nonlinear optical amplifier and the data pulses manifesting an input energy that is less than the saturation level. The nonlinear optical amplifier amplifies and phase delays the first incident clock pulse. The counter-propagating clock pulse experiences a large phase shift and reaches the input coupler at a displaced time and results in a coupling of the clock pulse to the output terminal. Data pulses, exhibiting a lower energy, experience only a small relative phase shift and constructively interfere at the loop coupler.

REFERENCES:
patent: 4881788 (1989-11-01), Doran
patent: 5493433 (1996-02-01), Prucnal et al.
patent: 5687260 (1997-11-01), ZLiedenbaum
Electronics Letters, vol. 30, No. 13 (1994) pp. 1084-1085, N. J. Smith et al., "Picosecond Soliton Propagation Using Nonlinear Optical Loop Mirros as Intensity Filters" no month.
Optics Letters, vol. 13, No. 1 (Jan. 1988) pp. 56-58, N. J. Doran et al., "Nonlinear-Optical Loop Mirror".
Optics Letters, vol. 14, No. 14 (Jul. 15, 1989) pp. 754-756, K. J. Blow et al., "Experimental Demonstration of Optical Soliton Switching in an All-Fiber Nonlinear Sagnac Interferometer".

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