Apparatus comprising a low reflection optical fiber termination

Details Apparatus comprising a low reflection optical fiber termination Apparatus comprising a low reflection optical fiber termination

1992-11-16

1993-11-16

Lee, John D.

Optical waveguides

With optical coupler

Input/output coupler

385 55, 385139, G02B 636

Patent

active

052631036

ABSTRACT:
This invention is an apparatus which comprises a low reflection optical fiber termination. The apparatus comprises an optical fiber having a core, a cladding and a designated end. The core of the fiber has an effective refractive index N (exemplarily 1.484.+-.0.026). A terminator having a refractive index approximately equal to N (e.g. to within .+-.3.5%) is attached in such a manner that the terminator and the designated fiber end are in intimate contact. The closer the refractive index of the terminator is to the refractive index of the core of the fiber, the less back reflection occurs. A curable polymer having a high refractive index can be used to coat the terminator and a portion of the fiber. There is no need to polish, bend, cleave, twist or taper the end of the optical fiber prior to attaching the substrate to the optical fiber. Thus, the apparatus can be readily and inexpensively practiced not only in the factory but also in the field.

REFERENCES:
patent: 4290667 (1981-09-01), Chown
patent: 4400053 (1993-08-01), Kazkaz
patent: 4512630 (1985-04-01), Runge
patent: 4979972 (1990-12-01), Berkey et al.
patent: 5048908 (1991-09-01), Blonder
patent: 5058983 (1991-10-01), Corke et al.
R. Rao et al., "High Return Loss Connector Design Without Using Fibre Contact or Index Matching", Electronics Letters, vol. 22, No. 14, pp. 731-732 (1986).

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