Photonic filtering of electrical signals
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United States of America Patent
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Jul 1, 2014
Grant Date -
Sep 16, 2010
app pub date -
Mar 8, 2010
filing date -
Mar 10, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A filter and a method of filtering a high frequency electrical signal using photonic components is disclosed. The filter has a serially fiber-coupled laser source, a modulator, a filter, and a photodetector. The electrical signal is applied to the modulator. The modulated light propagates through the filter which is constructed to pass not only a modulated sideband, but also at least a fraction of light at the carrier frequency of the laser. The photodetector detects a signal at the beat frequency between the carrier and sideband signals, after both signals have propagated through the filter. As a result, a separate optical branch for light at the carrier frequency is not required, which considerably simplifies the filter construction and makes it more stable and reliable.
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