Optical device formed with grating therein, add/drop filter usin

Details Optical device formed with grating therein, add/drop filter usin Optical device formed with grating therein, add/drop filter usin

1996-08-29

1998-12-08

Ullah, Akm E.

Optical waveguides

With optical coupler

Input/output coupler

G02B 634

Patent

active

058482075

ABSTRACT:
A width of a core in an optical waveguide is decreased in accordance with a value of a predetermined equation, as a distance of a position of the core to the center position thereof is decreased. Consequently, a rectangular spectrum property having no ripple is obtained on a lower wavelength side in a reflection grating. In addition, the width of the core is changed at the position Z in the direction of light propagation, while a UV light is radiated to the core, so that a periodically striated distribution of refractive indices having an envelope which is changed in accordance with a value of ".vertline.sin(C.multidot.Z).vertline./.vertline.C.multidot.Z.vertline." is formed in the core of the optical waveguide, and a phase of a light to be propagated in the direction of the light propagation is shifted at the position Z as defined below by .pi..

REFERENCES:
patent: 5367588 (1994-11-01), Hill et al.
patent: 5420948 (1995-05-01), Byron

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