CMOS-COMPATIBLE POLARIZATION-DIVERSE TUNABLE OPTICAL BANDPASS FILTER
First Claim
1. An optical device, comprising:
- a first optical filter adapted to apply bandpass filtering to a first component of an optical input signal to produce a first filtered signal, wherein said first component has a first polarization;
one or more polarization rotators adapted to change (i) the first polarization of the first filtered signal to a different second polarization and (ii) the second polarization of a second component of the optical input signal to the first polarization; and
a second optical filter adapted to apply bandpass filtering to the second component having the resulting first polarization to produce a second filtered signal, wherein the optical device is adapted to combine the first and second filtered signals to produce a filtered output signal.
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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.
23 Citations
20 Claims
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1. An optical device, comprising:
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a first optical filter adapted to apply bandpass filtering to a first component of an optical input signal to produce a first filtered signal, wherein said first component has a first polarization; one or more polarization rotators adapted to change (i) the first polarization of the first filtered signal to a different second polarization and (ii) the second polarization of a second component of the optical input signal to the first polarization; and a second optical filter adapted to apply bandpass filtering to the second component having the resulting first polarization to produce a second filtered signal, wherein the optical device is adapted to combine the first and second filtered signals to produce a filtered output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of processing optical signals, comprising:
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applying bandpass filtering to a first component of an optical input signal to produce a first filtered signal, wherein said first component has a first polarization; changing the first polarization of the first filtered signal to a different second polarization; changing the second polarization of a second component of the optical input signal to the first polarization; applying bandpass filtering to the second component having the resulting first polarization to produce a second filtered signal; and combining the first and second filtered signals to produce a filtered output signal.
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Specification