14-Vardaoulis-Optical Band Gap Devices_1_

14-Vardaoulis-Optical Band Gap Devices_1_ - FBG Advantages...

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Optical Devices: Optical Devices: Fiber Bragg Gratings Fiber Bragg Gratings Markito Vardaoulis gtg819s ECE 3085
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Introduction Introduction Optical device: A device for producing or controlling light. What are fiber Bragg gratings (FBGs)?
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How Do FBGs Work? How Do FBGs Work? The gratings become regions of a higher refractive index. Each time the light hits a region of higher index some gets reflected. Variations in the fiber trigger changes in the period of the grating.
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How Do FBGs Work? How Do FBGs Work? λ B = 2nΛ λ B = Bragg Wavelength n = Index of refraction Λ = Spacing between gratings
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How Are FBGs Made? How Are FBGs Made?
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How Are FBGs Made? How Are FBGs Made?
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What Can FBGs Do? What Can FBGs Do? Dispersion Compensation: Compensates for chromatic dispersion in an optical fiber. Wavelength Selective Devices: The ability to selectively reflect one or more wavelengths.
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FBG Advantages
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Unformatted text preview: FBG Advantages Low insertion losses. Compatibility with existing optical fibers. Allow low-cost manufacturing of very high quality wavelength-selective optical devices. FBG Advantages FBG Advantages Telecommunications: Corrects dispersion across an optical channel. Ability to select one of many wavelengths and reflect it. Sensors: Are usually smaller and lighter. Dont generate heat or sparks. Major Applications Major Applications Telecommunications: Dispersion Compensation Wavelength Selective Devices Sensors: Structural Chemical Summary Summary FBGs evolved from a discovery made by Hill in 1978. The wavelength reflected by an FBG is adjustable. Widespread use of FBGs in Telecommunications and Sensor Systems among others. Questions? Questions?...
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14-Vardaoulis-Optical Band Gap Devices_1_ - FBG Advantages...

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