Optical analog-to-digital converter

Vawter, G Allen; Raring, James; Skogen, Erik J

Optical analog-to-digital converter

Patent · Tue Jul 21 04:00:00 EDT 2009

OSTI ID:968641

Vawter, G Allen ^[1]; Raring, James ^[2]; Skogen, Erik J ^[3]

Corrales, NM
Goleta, CA
Albuquerque, NM

An optical analog-to-digital converter (ADC) is disclosed which converts an input optical analog signal to an output optical digital signal at a sampling rate defined by a sampling optical signal. Each bit of the digital representation is separately determined using an optical waveguide interferometer and an optical thresholding element. The interferometer uses the optical analog signal and the sampling optical signal to generate a sinusoidally-varying output signal using cross-phase-modulation (XPM) or a photocurrent generated from the optical analog signal. The sinusoidally-varying output signal is then digitized by the thresholding element, which includes a saturable absorber or at least one semiconductor optical amplifier, to form the optical digital signal which can be output either in parallel or serially.

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM

Sponsoring Organization:: United States Department of Energy

DOE Contract Number:: AC04-94AL85000

Assignee:: Sandia Corporation (Albuquerque, NM)

Patent Number(s):: 7,564,387

Application Number:: 12/039,931

OSTI ID:: 968641

Country of Publication:: United States

Language:: English

References (10)

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28 ps recovery time in an InGaAsP/InGaAsP multiple-quantum-well saturable absorber employing carrier sweepout Burr, E. P.; Song, J. B.; Seeds, A. J. Journal of Applied Physics, Vol. 90, Issue 7 https://doi.org/10.1063/1.1399032	journal	October 2001
2R limiter circuit with gain clamped SOA for XGM wavelength converter Kang, J. -M.; Kim, Y. -O.; Lee, J. -H. IEE Proceedings - Optoelectronics, Vol. 152, Issue 1 https://doi.org/10.1049/ip-opt:20051092	journal	February 2005
Semiconductor optical amplifier-based all-optical gates for high-speed optical processing Stubkjaer, K. E. IEEE Journal of Selected Topics in Quantum Electronics, Vol. 6, Issue 6 https://doi.org/10.1109/2944.902198	journal	November 2000

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