tutorial-1 - . • re diameter: 8 ~ 62.5 m. Core diameter:...

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Total Internal Reflection (TIR) Reflection: light traveling from a higher refractive index medium to a lower Ref 1: http://www.fiberoptics4sale.com/Merchant2/optical fiber.php refractive index medium will bend away from the normal An interesting implication: at the critical angle θ c , light traveling from a higher refractive index medium to a lower refractive index medium will be refracted at 90°; in other words, refracted along the interface. θ c = arcsin( n 2 / n 1 ) Total internal reflection: if the light hits the interface at any angle larger than this critical angle, it will be reflected back into the first medium.
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From TIR to optical fiber g: from Ref Light in the core that strikes the boundary with the cladding at an angle Fig: from Ref 1 shallower than critical angle will be reflected back into the core by TIR. The Structure of an Optical Fiber Typical optical fibers are composed of core, cladding and buffer coating
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Unformatted text preview: . • re diameter: 8 ~ 62.5 m. Core diameter: 8 62.5 μm. • The most common cladding diameter is 125 μm. • Buffer coating diameter: 250 ~ 900 μm. Fig: from Ref 1 To provide mechanical protection and bending flexibility. Numerical aperture Optical Fiber Mode Fig: from Ref 1 • Mode: describes the distribution of light energy across the fiber. • Multimode fibers: fibers that can carry more than one mode at a specific light wavelength. • Single mode fibers: some fibers have very small diameter core that they can carry only one mode which travels as a straight line at the center of the core. What is the pros and cons of MMF and SMF? Does pulse spreading exist in SMF? paths For SMF: V ≤ 2.045 δ is the phase difference between the two orthogonal components. Why non ‐ zero dispersion is preferred? Solutions ‐ 1 Solutions ‐ 2...
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tutorial-1 - . • re diameter: 8 ~ 62.5 m. Core diameter:...

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