Depressed cladding fiber design for reducing coupling to cladding modes in fiber gratings
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United States of America Patent
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Dec 22, 1998
Grant Date -
N/A
app pub date -
Jun 30, 1997
filing date -
Jun 30, 1997
priority date (Note) -
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Abstract
A waveguide, such as an optical fiber waveguide for guiding light waves, which can provide a strongly reflective grating (e.g., a Bragg grating) at a specified wavelength while maintaining very low losses at adjacent wavelengths. The waveguide includes a core, an inner cladding laterally surrounding the core, an outer cladding laterally surrounding the inner cladding, and a grating pattern. The core has a refractive index n.sub.co and a first transverse dimension 2A. The inner cladding has a width W and a refractive index n.sub.ic. The outer cladding has a refractive index n.sub.oc. The relation between the refractive indexes, n.sub.co >n.sub.oc >n.sub.ic and 0.5
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