Single resonant band, tunable optical fiber wavelength filter based on long-period fiber grating
First Claim
1. An optical filter that has a wavelength response over a portion of the spectrum and that is tunable to different wavelengths in said portion of the spectrum, said optical filter comprising:
- a core with a long period grating disposed thereon;
a first cladding layer disposed on said core and a second electro-optic cladding layer disposed on said first cladding layer, wherein said first cladding layer has an ultra-thin thickness that supports only a single resonant band over said portion of the spectrum as compared to greater thicknesses of said first cladding that support a plurality of resonant bands over said portion of the spectrum, wherein said ultra-thin thickness is in the range of about 20 to about 40 μ
m and wherein said resonant band is tunable to said different wavelengths by a voltage applied to said second electro-optic cladding layer.
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Accused Products
Abstract
An optical filter that is tunable over a wide portion of the spectrum, such as the infrared portion. The filter has a core of silica fiber with a first cladding layer of silica fiber disposed thereon. A long period grating is disposed on the core. A second electro-optical cladding layer is disposed on the first cladding layer. The first cladding layer is ultra thin so as to support only a single resonant band over the spectral portion. The resonant band is tunable to different wavelengths in the spectral portion by a voltage applied to the second electro-optic layer. The electro-optic layer is a copolymer that has a refractive index less than that of the silica fiber material. The optical filter has fast tuning speed (nanosecond range), wide tuning range (>50 nm), low insertion loss (<0.1 dB), narrow bandwidth (<0.5 nm), and low sidelobe (<30 dB).
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Citations
13 Claims
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1. An optical filter that has a wavelength response over a portion of the spectrum and that is tunable to different wavelengths in said portion of the spectrum, said optical filter comprising:
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a core with a long period grating disposed thereon;
a first cladding layer disposed on said core and a second electro-optic cladding layer disposed on said first cladding layer, wherein said first cladding layer has an ultra-thin thickness that supports only a single resonant band over said portion of the spectrum as compared to greater thicknesses of said first cladding that support a plurality of resonant bands over said portion of the spectrum, wherein said ultra-thin thickness is in the range of about 20 to about 40 μ
m and wherein said resonant band is tunable to said different wavelengths by a voltage applied to said second electro-optic cladding layer.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical filter that has a wavelength response over a portion of the spectrum and that is tunable to different wavelengths in said portion of the spectrum, said optical filter comprising:
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a core with a long period grating disposed thereon;
a first cladding layer disposed on said core and a second electro-optic cladding layer disposed on said first cladding layer, wherein said first cladding layer has an ultra-thin thickness that supports only a single resonant band over said portion of the spectrum as compared to greater thicknesses of said first cladding that support a plurality of resonant bands over said portion of the spectrum, wherein said resonant band is tunable to said different wavelengths by a voltage applied to said second electro-optic cladding layer, and wherein said plurality of resonant bands is three or more.
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10. An optical filter that has a wavelength response over a portion of the spectrum and that is tunable to different wavelengths in said portion of the spectrum, said optical filter comprising:
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a core with a long period grating disposed thereon;
a first cladding layer disposed on said core and a second electro-optic cladding layer disposed on said first cladding layer, wherein said first cladding layer has an ultra-thin thickness that supports only a single resonant band over said portion of the spectrum as compared to greater thicknesses of said first cladding that support a plurality of resonant bands said portion of the spectrum, wherein said resonant band is tunable to said different wavelengths by a voltage applied to said second electro-optic cladding layer, and wherein said portion of the spectrum is substantially the entire near infrared range.
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11. A method for producing an optical filter, comprising:
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providing an optical core with a long period grating;
disposing a cladding layer on said core, said cladding layer having a thickness that supports a plurality of resonant bands over a portion of the spectrum;
reducing said thickness at least until said thickness supports only a single resonant band over said portion of the spectrum, and wherein said thickness is reduced to the range of about 20 to about 40 μ
m.- View Dependent Claims (12)
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13. A method for producing an optical filter, comprising:
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providing an optical core with a long period grating;
disposing a cladding layer on said core, said cladding layer having a thickness that supports a plurality of resonant bands over a portion of the spectrum, wherein said portion of the spectrum is substantially the entire near infrared range;
reducing said thickness at least until said thickness supports only a single resonant band over said portion of the spectrum.
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Specification