Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Reexamination Certificate
2002-08-20
2009-02-03
Pritchett, Joshua L (Department: 2872)
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
C359S490020
Reexamination Certificate
active
07486443
ABSTRACT:
An improved optical switch utilizes one polarization modulator, with the beam components traversing it twice. Because of the twice traverse, the extinction ratio of the switch is doubled without the addition of another polarization modulator, thus avoiding the costs of additional optical components. With no additional components, the switch is more compact than conventional switches with the same extinction ratio. Fewer components also result in more thermal and long-term stability and less crosstalk.
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Li Ming
Peng Song
Avanex Corporation
Patterson & Sheridan LLP
Pritchett Joshua L
LandOfFree
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