Optical device with a pig tail optical fiber and its production

Details Optical device with a pig tail optical fiber and its production Optical device with a pig tail optical fiber and its production

1994-06-10

1995-12-12

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling function

385 50, 385 88, G02B 626

Patent

active

054757770

ABSTRACT:
An optical waveguide with a specific refractive index difference .DELTA..sub.1 has a constitution in which a core with a high refractive index and having a rectangular section is built in a cladding layer with a low refractive index formed on a substrate. A pig tail optical fiber, formed by a first fiber serially connected to a second fiber, each having a different specific refractive index difference, is connected to an input terminal of the optical waveguide. The second fiber has a specific refractive index difference .DELTA..sub.2 (<.DELTA..sub.1) and is connected to a terminal of the first fiber which has a specific refractive index difference nearly equal to .DELTA..sub.1. A diffusion region in the neighborhood of the connection is formed by diffusing a dopant for refractive index control in the core of the second fiber by heat addition. Due to the diffusion region, the diameters of the first fiber and the second fiber are adjusted so as to be nearly equal.

REFERENCES:
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patent: 5138675 (1992-08-01), Schofield
patent: 5175781 (1992-12-01), Hockaday et al.
patent: 5231683 (1993-07-01), Hockaday et al.
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patent: 5337380 (1994-08-01), Darbon et al.
Low-Loss and Large-Tolerance Fiber Coupling of High-delta Silica Waveguides by Local Mode-Field Conversion by M. Yanagisawa et al,; IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 5, No. 4, pp. 433-435; Apr. 1993, New York, US.
Vertical In/InGas_AsP Tapers for Low-loss Optical Fibre-Wavelength Coupling by T. Brenner et al.; ELECTRONECS LETTERS, vol. 28, No. 22, pp. 2040-2041; Oct. 22, 1992, Stevenage GB.

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