Two wavelength range photodiode demultiplexer and methods for using the same
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United States of America Patent
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Jun 10, 2014
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Jan 6, 2012
filing date -
Jun 12, 2009
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Abstract
A method is provided for demultiplexing optical signals. A first photodiode accepts first optical signals in a first range of wavelengths with second optical signals in a second range of wavelengths greater than the first range. First electrical signals are generated in the first photodiode in response to the first optical signals. A second photodiode accepts the second optical signals, and generates second electrical signals in response to the second optical signals. The first photodiode substantially absorbs photons associated with the first optical signal, and substantially passes photons associated with the second optical signals. In one aspect, the first photodiode has a first coefficient of absorption associated with the first range of wavelengths and the second photodiode has a second coefficient of absorption and a half value layer (HVL) associated with the second range of wavelengths. The first photodiode has thickness less than the HVL of the second photodiode.
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