Interferometer, demodulator, and optical communication module
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United States of America Patent
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Oct 14, 2014
Grant Date -
Aug 4, 2011
app pub date -
Jan 6, 2011
filing date -
Feb 1, 2010
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Abstract
When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed.
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