Optical waveguides – Polarization without modulation
Reexamination Certificate
2005-05-31
2005-05-31
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Polarization without modulation
C385S016000
Reexamination Certificate
active
06901175
ABSTRACT:
A device for filtering at least a predetermined selected optical signal having a predetermined wavelength range from a series of optical signals, the device comprising: a polarisation alignment means for substantially aligning substantially orthogonal polarisation states of an optical input signal so as to produce a polarisation aligned optical signal; a polarisation manipulation means for imparting a controlled polarisation manipulation to the polarisation aligned optical signal so as to output a polarisation manipulated optical signal having one of at least two distinguishable polarisation states including a first polarisation state and a second polarisation state; and an optical separation means for spatially separating the selected optical signal from the series of optical signals when the polarisation state of the polarisation manipulated optical signal is in a first polarisation state, thereby forming a first and second output optical signal, and maintaining the spatial alignment of the selected optical signal with the series of optical signals when the polarisation manipulated optical signal is in a second polarisation state so as to form a third optical output.
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Abakoumov Dmitri
Baxter Glenn W.
Frisken Steven
Engana Ltd.
Lin Tina M
Townsend and Townsend / and Crew LLP
Ullah Akm Enayet
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