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US 2009/0214223 A1Published application
Cmos-compatible tunable microwave photonic band-stop filter
AssigneeLucent Technologies Inc.
InventorsYoung-Kai Chen, Sanjay Patel, Mahmoud Rasras, Kun-Yii Tu
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Abstract
According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the modulator is applied to an optical filter having at least two tunable spectral attenuation bands that are located substantially symmetrically on either side of the carrier frequency. The resulting filtered optical signal is applied to an optical-to-electrical (O/E) converter to produce an electrical output signal.
Claims20
A device, comprising:
- an optical modulator adapted to modulate an optical signal having an optical carrier frequency to generate a modulated optical signal, said modulation being based on an electrical input signal;
- an optical filter having first and second spectral attenuation bands and adapted to filter said modulated optical signal to produce a filtered optical signal, wherein the optical carrier frequency is substantially centered between said first and second spectral attenuation bands;
- and
- an optical-to-electrical (O/E) converter adapted to convert the filtered optical signal into an electrical output signal.
1 more element
A method of processing electrical signals, comprising:
- modulating an optical signal having an optical carrier frequency to generate a modulated optical signal, said modulation being based on an electrical input signal;
- filtering said modulated optical signal in an optical filter having first and second spectral attenuation bands to produce a filtered optical signal, wherein the optical carrier frequency is substantially centered between said first and second spectral attenuation bands;
- and
- converting the filtered optical signal into an electrical output signal.
1 more element
Dependencies are inferred from the claim text.