Optoelectronic oscillator with tunable filter
First Claim
1. An optoelectronic oscillator (OEO) comprising:
- a set of optical domain components;
a downconverter in communication with an output of the optical domain components; and
a set of radio frequency (RF) domain components in communication with an output of the downconverter, the set of RF domain components comprising;
a tunable filter operating at a filter center frequency and having an output coupled to the set of optical domain components for communicating a mode selection result, the tunable filter including;
a tuner; and
a fixed frequency sub-filter operating at a sub-filter center frequency to provide mode selection and adjacent mode suppression with respect to the tunable filter center frequency, the sub-filter center frequency being lower than the tunable filter center frequency, and a ratio of the tunable filter center frequency to a bandwidth of the sub-filter being at least 1000;
1.
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Accused Products
Abstract
An optoelectronic oscillator (OEO) is disclosed comprising an electronically tunable filter for transposing narrow pass band characteristics of a surface acoustic wave (SAW) filter to a microwave frequency to provide mode selection in the OEO. An OEO is disclosed comprising a set of optical domain components, a downconverter in communication with an output of the optical domain components, and a set of radio frequency (RF) domain components in communication with an output of the downconverter. The set of RF domain components comprises a tunable filter operating at a filter center frequency and having an output coupled to the set of optical domain components for communicating a mode selection result. The tunable filter including a tuner; and a sub-filter. The sub-filter operating at a fixed center frequency to provide mode selection and adjacent mode suppression with respect to the tunable filter center frequency. The sub-filter center frequency being lower than the tunable filter center frequency, and a ratio of the tunable filter center frequency to a bandwidth of the sub-filter being at least 1000:1.
4 Citations
21 Claims
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1. An optoelectronic oscillator (OEO) comprising:
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a set of optical domain components; a downconverter in communication with an output of the optical domain components; and a set of radio frequency (RF) domain components in communication with an output of the downconverter, the set of RF domain components comprising; a tunable filter operating at a filter center frequency and having an output coupled to the set of optical domain components for communicating a mode selection result, the tunable filter including; a tuner; and a fixed frequency sub-filter operating at a sub-filter center frequency to provide mode selection and adjacent mode suppression with respect to the tunable filter center frequency, the sub-filter center frequency being lower than the tunable filter center frequency, and a ratio of the tunable filter center frequency to a bandwidth of the sub-filter being at least 1000;
1.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification