Depressed cladding fiber design for reducing coupling to claddin

Details Depressed cladding fiber design for reducing coupling to claddin Depressed cladding fiber design for reducing coupling to claddin

1997-06-30

1998-12-22

Ngo, Hung N.

Optical waveguides

With optical coupler

Input/output coupler

385127, G02B 634

Patent

active

058526900

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<A/(A+W)<1, define a narrow depressed well region for limiting cladding losses.

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