Parallel conversion between optical and digital
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United States of America Patent
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Jun 24, 2014
Grant Date -
Dec 20, 2012
app pub date -
Jun 14, 2011
filing date -
Jun 14, 2011
priority date (Note) -
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Abstract
A coherent optical receiver Includes an electro-optic module coupled to an electronic signal processing Integrated circuit (IC) via a parallel analog transmission line bus. The electro-optic module receives and detects an optical channel light including a high-bandwidth signal modulated thereon. The electro-optic module includes: a single optical hybrid for mixing the optical channel light with a corresponding continuous wave local oscillator light to generate a mixed light containing the high-bandwidth data signal, at least one photodetector; and an analog frequency decimator for generating a set of parallel analog signals, each analog signal representing a respective portion of the high-bandwidth signal. The electronic signal processing IC includes a respective Analog-to-digital (A/D) converter for sampling each one of the set of parallel analog signals, and for generating corresponding parallel digital sample streams; and a digital signal processor (DSP) for processing the parallel digital sample streams to extract the high-bandwidth signal.
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