Physics Courses - Optical waveguides · This relation may be written in terms of the cutoff angular...
Transcript of Physics Courses - Optical waveguides · This relation may be written in terms of the cutoff angular...
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Optical waveguides
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Planar-mirror waveguide
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Planar-dielectric waveguide
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Compare with planar-mirror case:
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“Internal” solution:
“External” solution, match at boundaries (homework):Compare with planar-mirror case:
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Two-dimensional waveguidesMirror waveguide Dielectric waveguide
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Photonic crystal waveguides
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Fiber optics
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Fiber optics as guided rays
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Fiber optics as guided rays
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Fiber optics as guided WAVES
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Similar to the planar (& 2D)dielectric waveguide solutions:
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Polarization maintaining fibers
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Why telecom uses 1550 nm light:
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Finally, the ultimate fiber: Photonic crystal fibers
Benefits:• Single mode for a broad range of wavelengths• Large mode area, e.g., step-index fiber 5 um, vs 50 um• -> can handle more power• Dispersion can also be engineered
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