CMOS-compatible polarization-diverse tunable optical bandpass filter
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United States of America Patent
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Mar 16, 2010
Grant Date -
Jul 16, 2009
app pub date -
Jan 15, 2008
filing date -
Jan 15, 2008
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Abstract
According to one embodiment, an optical filter has a polarization rotator and two instances of an optical bandpass filter (OBPF). The first instance of the OBPF processes a TE-polarized component of an optical input signal to produce a first filtered signal. The polarization rotator then transforms the TE polarization of the first filtered signal into the TM polarization. The polarization rotator also transforms the polarization of a TM-polarized component of the optical input signal into the TE polarization. The second instance of the OBPF processes the resulting TE-polarized signal to produce a second filtered signal. The first and second filtered signals having TM and TE polarizations, respectively, are then combined to produce a filtered output signal.
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