Wavelength branching filter and optical communication module
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United States of America Patent
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Aug 25, 2009
Grant Date -
Jan 25, 2007
app pub date -
May 31, 2006
filing date -
Jul 20, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a low-cost wavelength branching filter that transmits lights of 1310 nm wavelength band, and reflects light of 1490 nm and 1650 nm wavelength bands. In one embodiment, a wavelength branching filter includes a first multilayer film filter positioned in a light incoming side on a glass substrate and a second multilayer film filter positioned in a light outgoing side, and the first multilayer film filter has characteristic in reflecting light of 1490 nm wavelength band and transmitting light of 1310 nm wavelength band, and the second multilayer film filter has characteristic in reflecting light of 1650 nm wavelength band and transmitting light of 1650 nm wavelength band and reflecting light of 1310 nm wavelength band.
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