Optical depolarizers and DGD generators based on optical delay
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United States of America Patent
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May 19, 2009
Grant Date -
Dec 27, 2007
app pub date -
Dec 26, 2006
filing date -
Apr 18, 2002
priority date (Note) -
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Abstract
Techniques and devices for depolarizing light and producing a variable differential group delays in optical signals. In one implementation, an input optical beam is split into first and second beams with orthogonal polarizations. One or two optical reflectors are then used to cause the first and second optical beams to undergo different optical path lengths before they are recombined into a single output beam. An adjustment mechanism may used implemented to adjust the difference in the optical path lengths of the first and second beams to produce a variable DGD. When the depolarization of light is desired, the difference in the optical path lengths of the first and second beams is set to be greater than the coherence length of the input optical beam.
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