Coded data generation or conversion – Analog to or from digital conversion – Using optical device
Patent
1997-12-24
2000-09-12
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Using optical device,
25022214, G02F 700
Patent
active
061183962
ABSTRACT:
An ultra-fast electrooptic analog-to-digital converter is described. The A/D converter includes an electrooptic modulator that generates a modulated light beam from an incident light beam in response to an applied modulation signal. An optical demultiplexer is positioned to receive the modulated light beam. The optical input of a respective one of a plurality of photodetectors is optically coupled to a respective one of a plurality of demultiplexed modulated light beams. Each of the plurality of photodetectors generates an electrical signal in response to an intensity of the demultiplexed modulated light beam that is coupled to its optical input. A plurality of charge comparators compares electrical signals generated in response to the intensities of the demultiplexed modulated light beam to a reference signal. The output of each of the plurality of charge comparators generates a digital representation of the incident light beam.
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Massachusetts Institute of Technology
Williams Howard L.
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