Optical analog to digital converter

Details Optical analog to digital converter Optical analog to digital converter

1988-01-06

1989-07-25

Shoop Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Using optical device,

341 13, 341 14, H03M 112

Patent

active

048518409

ABSTRACT:
An analog to digital converter, adapted to convert an optical analog signal to an equivalent optical digital signal being one of x optically presented digital numbers defined by an n-bit digital word, where X=2.sup.n. The optical analog signal is light having an intensity variable over a range from a minimum to a maximum value. The analog to digital converter comprises a linear array of comparator means, a linear array of logic means, and a linear array of decoding means. The linear array of comparator means is responsive to the light at a plurality of input positions, x, and produces binary threshold signals which respresent a one-dimensional spacial reference having a length of corresponding to the magnitude of the sensed intensity. The linear array of logic means is responsive to the binary threshold signals and produces an optical index signal which is a one-point spacial reference having a location, an index postion, corresponding to the length of the one-dimensional spacial reference. The linear array of decoding means is responsive to the optical index signal and projects the digital number corresponding to the sensed intensity as the optical digital signal in response to being illuminated by the optical index signal.

REFERENCES:
patent: 4546244 (1985-10-01), Miller
patent: 4549788 (1985-10-01), Chemla
patent: 4626075 (1986-12-01), Chemla
Miller et al., "The Quantum Well Self-Electrooptic Effect Device: Optoelectronic Bistability and Oscillation and Self-Linearized Modulation, " J. Quantum Electronics vol. QE-21, No. 9, Sept. 1985.
Taylor et al., "A New Double Heterostructure Optoelectronic Switching Device Using Molecular Beam Epitaxy, " J. Appl. Phys. 59 (2) Jan. 15, 1986.

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