High efficiency channel drop filter with absorption induced on/off switching and modulation
First Claim
1. An electromagnetic field frequency filter comprising:
- an input waveguide which carries a signal having at least one frequency including at least one desired frequency;
an output waveguide; and
a resonator-system coupled between said input and output waveguides operable for the adjustable transfer of said at least one desired frequency to said output waveguide and transmission of undesired frequencies through said input waveguide in response to a variation of the internal decaying rate of at least one resonator of said resonator-system, said resonator-system being comprised of resonators, and defining at least two system modes of opposite symmetry, said system modes consisting in part of a linear combination of resonant modes of said resonators, said resonator-system being specifically configured such that at least two of said system modes have substantially the same frequency when said transfer occurs substantially.
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Accused Products
Abstract
A highly efficient channel drop filter. The filter employs a coupling element including a resonator-system between two waveguides, which contains at least two resonant modes. The resonator-system includes one or more interacting resonant cavities which in addition to being coupled to the waveguides, can also be coupled directly among themselves and indirectly among themselves via the waveguides. Each component of the coupling element can be configured or adjusted individually. The geometry and/or dielectric constant/refractive index of the resonator-system are configured so that the frequencies and decay rates of the resonant modes are made to be substantially the same. The filter can achieve 100% signal transfer between the waveguides at certain frequencies, while completely prohibiting signal transfer at other frequencies. In exemplary embodiments, the filter is configured with photonic crystals. In accordance with alternative embodiments of the invention, the filter is configured as an absorption induced on/off switch and modulator. The switching action is achieved with either electrical or optical absorption.
236 Citations
50 Claims
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1. An electromagnetic field frequency filter comprising:
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an input waveguide which carries a signal having at least one frequency including at least one desired frequency; an output waveguide; and a resonator-system coupled between said input and output waveguides operable for the adjustable transfer of said at least one desired frequency to said output waveguide and transmission of undesired frequencies through said input waveguide in response to a variation of the internal decaying rate of at least one resonator of said resonator-system, said resonator-system being comprised of resonators, and defining at least two system modes of opposite symmetry, said system modes consisting in part of a linear combination of resonant modes of said resonators, said resonator-system being specifically configured such that at least two of said system modes have substantially the same frequency when said transfer occurs substantially. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electromagnetic field frequency filter comprising:
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an input waveguide which carries a signal having at least one frequency including at least one desired frequency; an output waveguide; and a resonator-system coupled between said input and output waveguides operable for the adjustable transfer of said at least one desired frequency to said output waveguide and transmission of undesired frequencies through said input waveguide in response to a variation of the internal decaying rate of at least one resonator of said resonator-system, said resonator-system being comprised of resonators, and including at least two resonators that couple directly to said input waveguide with similar coupling strength and that further couple directly with each other, said at least two resonators each supporting no more than one resonant mode at or near said desired frequency. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An electromagnetic field frequency filter comprising:
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an input waveguide which carries a signal having at least one frequency including at least one desired frequency; an output waveguide; and a photonic crystal resonator-system coupled between said input and output waveguides and being operable for the adjustable transfer of said at least one desired frequency to said output waveguide and transmission of undesired frequencies through said input waveguide in response to a variation of the internal decaying rate of at least one resonator of said resonator-system. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. An electromagnetic field frequency filter comprising:
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a waveguide having an input port and an output port, said waveguide receiving a signal having at least one frequency including at least one desired frequency; and a resonator-system incorporated in said waveguide between said input and output ports, said resonator-system defining at least one resonant mode, said resonator-system operable for the adjustable transmission of said at least one desired frequency to said output port in response to a variation of the internal decaying rate of at least one resonator of said resonator-system. - View Dependent Claims (45, 46, 47, 48, 49, 50)
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Specification