All optical phase insensitive wavelength converters,...

Details All optical phase insensitive wavelength converters,... All optical phase insensitive wavelength converters,...

2006-10-17

2006-10-17

Lee, John D. (Department: 2874)

Optical: systems and elements

Optical frequency converter

Reexamination Certificate

active

07123401

ABSTRACT:
In one version, the present invention provides an all optical device for wavelength conversion, reshaping, modulating, and regenerating, including: a splitting device having first, second, third, and fourth terminals; a nonlinear element, and an attenuator; the third and fourth terminals being associated with an optical loop including the attenuator and the nonlinear element, the nonlinear element being displaced from a center of the optical loop, wherein the splitting device is arranged to receive a modulated signal from one of the first and second terminals and a continuous beam from one of the first and second terminals and to generate based on the continuous beam a patterned signal at one of the first and second terminals, and wherein the widths of pulses of the patterned signal are proportional to the widths of pulses of the modulated signal. In an alternative version according to the present invention, the optical loop includes a nonlinear element and a coupling device for receiving chopped signals.

REFERENCES:
patent: 5673140 (1997-09-01), Fisher
O'Neill et al, “All-Optical Loop Mirror Switch Employing An Asymmetric Amplifier/Attenuator Combination”, Electronics Letters, vol. 26, No. 24, Nov. 22, 1990, pp. 2008-2009.
Eiselt, “Optical Loop Mirror With Semiconductor Laser Amplifier”, Electronics Letters, vol. 28, No. 16, Jul. 30, 1992, pp. 1505-1507.

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