PLC-type delay demodulation circuit and PLC-type optical interferometer
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United States of America Patent
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Jul 2, 2013
Grant Date -
Jan 10, 2013
app pub date -
Sep 13, 2012
filing date -
May 31, 2010
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Abstract
Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output waveguides. In a PLC-type delay demodulation circuit, arm waveguides of a first MZI and arm waveguides of a second MZI are formed so as to overlap each other in the same region of a planar lightwave circuit. The optical paths of the MZIs are arranged such that the propagation directions of two DQPSK signals branched by a Y-branch waveguide are opposite to each other.
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