Devices and applications based on tunable wave-guiding bragg gratings with nonlinear group delays
First Claim
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1. A device for processing two or more optical WDM channels, comprising:
- an optical fiber having an optic axis along said fiber to guide two or more WDM channels;
a fiber grating formed in said fiber to have a spatial grating pattern that has a Bragg reflection band that spectrally covers at least two adjacent WDM channels and reflects received optical spectral components within said Bragg reflection band to produce time delays in different reflected optical spectral components in said two adjacent WDM channels as a nonlinear function of wavelength; and
a grating control unit coupled to interact with said fiber grating to tune at least dispersion of said different reflected optical spectral components.
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Abstract
Techniques, devices, and systems for generating tunable dispersions to control or compensate for dispersions in optical signals by using wave-guiding grating elements with nonlinear group delays.
84 Citations
52 Claims
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1. A device for processing two or more optical WDM channels, comprising:
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an optical fiber having an optic axis along said fiber to guide two or more WDM channels;
a fiber grating formed in said fiber to have a spatial grating pattern that has a Bragg reflection band that spectrally covers at least two adjacent WDM channels and reflects received optical spectral components within said Bragg reflection band to produce time delays in different reflected optical spectral components in said two adjacent WDM channels as a nonlinear function of wavelength; and
a grating control unit coupled to interact with said fiber grating to tune at least dispersion of said different reflected optical spectral components. - 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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22. A device for processing two or more optical WDM channels, comprising:
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an optical fiber having an optic axis along said fiber to guide two or more WDM channels;
a fiber grating formed in said fiber and configured to have a spatial grating pattern that has a Bragg reflection band spectrally covering at least two adjacent WDM channels and is configured to produce a time delay in a reflected signal which depends nonlinearly on wavelength and includes at least a cubic function of the wavelength; and
a grating control unit coupled to interact with said fiber grating to tune both dispersion and dispersion slope produced by said fiber grating in each reflected optical spectral component. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A device, comprising:
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a first fiber Bragg grating having a first spatial grating pattern with a first Bragg reflection band covering at least two adjacent WDM channels to produce a group delay in each reflected optical signal as a nonlinear function of a detuning in wavelength from a center wavelength of said first Bragg reflection band, said first fiber Bragg grating reflecting at least a portion of input light to produce a first optical output;
a second fiber Bragg grating coupled to receive said first optical output from said first fiber Bragg grating to reflect at least a portion to produce a second optical output, said second fiber Bragg grating configured to have a second spatial grating pattern with a second Bragg reflection band covering at least said two adjacent WDM channels to produce a group delay in each reflected optical signal as a nonlinear function of a detuning in wavelength from a center wavelength of said second Bragg reflection band; and
a grating control unit coupled to at least one of said first and said second fiber Bragg gratings to control said one fiber Bragg grating to tune at least a net grating dispersion in each of said two adjacent WDM channels in said second optical output. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for processing two or more optical WDM channels, comprising:
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causing at least two adjacent optical WDM channels to be directed into a fiber grating to reflect said two optical WDM channels, said fiber grating configured to have a spatial grating pattern that has a Bragg reflection band spectrally covering at least said two adjacent WDM channels to produce time delays in different reflected optical spectral components in said two adjacent WDM channels as a nonlinear function of the wavelength; and
causing said fiber grating to be adjusted to tune at least a dispersion in each of said two WDM channels reflected from said fiber grating. - View Dependent Claims (47, 48, 49, 50, 51, 52)
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Specification