Optical apparatus with faraday rotator, static gain flattening filter and variable optical attenuator
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United States of America Patent
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Feb 1, 2005
Grant Date -
Nov 8, 2001
app pub date -
Mar 13, 2001
filing date -
Jun 16, 1997
priority date (Note) -
Expired
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Abstract
An optical apparatus for transmitting an optical signal includes a static filter, a Faraday rotator and a reflector. The Faraday rotator makes a first change in polarization of an optical signal in a first direction, and a second change in polarization of the optical signal received from the reflector in a second direction. This produces a polarization of the optical signal that is substantially orthogonal to an initial polarization state of the optical signal.
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