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US 10,547,280 B2Granted
Photonics based tunable multiband microwave filter
AssigneeUniversity of Georgia Research Foundation, Inc.
InventorsMable P. Fok, Jia Ge
Life of this patent
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Abstract
Various examples are provided for tunable radio frequency (RF) filtering. In one example, a RF multiband filter includes a Lyot filter including a tunable birefringence loop including a circulator and a polarization controller (PC) and a phase modulator (PM). The Lyot filter can generate an optical comb based at least in part upon a received optical signal and a polarization rotation angle of the polarization controller. The phase modulator (PM) can generate a modulated tap signal by modulating the optical comb by a RF input signal.
Claims20
A radio frequency (RF) filter, comprising:
- a Lyot filter comprising a tunable birefringence loop comprising a length of polarization maintaining fiber (PMF), a circulator and a polarization controller (PC), the PC coupled to a distal end of the PMF through the circulator, where a received optical signal is provided to the PMF through a loop coupling circulator coupled to a proximal end of the PMF, the Lyot filter configured to generate an optical comb based at least in part upon the received optical signal and a polarization rotation angle of the PC;
- and
- a phase modulator (PM) configured to generate a modulated tap signal by modulating the optical comb by a RF input signal.
Dependencies are inferred from the claim text.