Wavelength division multiplexer and demultiplexer
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Dec 18, 1995
filing date -
Dec 18, 1995
priority date (Note) -
Expired
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Abstract
A demultiplexer employs collimators for directing light of different wavelengths towards a filter so that light of one wavelength may be passed while reflecting light of other wavelengths. Light of the wavelengths that are passed or reflected may again be directed towards the same or different filter for further demultiplexing. The filter used has a characteristic wavelength band that varies with the angle of incidence to the filter. The same types of filter may be used for multiplexing. An input beam is passed through a filter at an angle of incidence at which light of a different wavelength would be reflected. Thus two input beams carrying such two wavelengths are directed towards the same location of the filter on opposite sides of the filter so that the reflected light of one wavelength will emerge as one beam with light of the other wavelength that passes through the filter. The emerging beam is then collected to multiplex light of the two wavelengths. This process can be repeated to multiplex light of a plurality of wavelengths.
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