CMOS-compatible tunable microwave photonic band-stop filter
First Claim
Patent Images
1. 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, wherein the optical filter comprises;
a Mach-Zehnder interferometer having first and second internal interferometer arms, both coupled between two optical couplers; and
first, second, third, and fourth optical resonators, each coupled to the first interferometer arm.
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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.
26 Citations
20 Claims
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1. A device, comprising:
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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, wherein the optical filter comprises; a Mach-Zehnder interferometer having first and second internal interferometer arms, both coupled between two optical couplers; and first, second, third, and fourth optical resonators, each coupled to the first interferometer arm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19)
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13. A method of processing electrical signals, comprising:
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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, wherein the optical filter comprises; a Mach-Zehnder interferometer having first and second internal interferometer arms, both coupled between two optical couplers; and first, second, third, and fourth optical resonators, each coupled to the first interferometer arm. - View Dependent Claims (14, 15, 16, 17, 18)
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20. A device, comprising:
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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, wherein the optical filter comprises; a Mach-Zehnder interferometer having first and second internal interferometer arms, both coupled between two optical couplers; first and second optical resonators, each coupled to the first interferometer arm, wherein; optical losses induced by the first optical resonator result in the first spectral attenuation band; and optical losses induced by the second optical resonator result in the second spectral attenuation band; and third and fourth optical resonators, each coupled to a corresponding one of the first and second interferometer arms via a corresponding tunable optical coupler, wherein; the optical filter further has third and fourth spectral attenuation bands; optical losses induced by the third optical resonator result in the third spectral attenuation band; optical losses induced by the fourth optical resonator result in the fourth spectral attenuation band; and both the third optical resonator and the fourth optical resonator are coupled to the first interferometer arm.
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Specification