Diffraction grating type band-pass filter and method of making t

Details Diffraction grating type band-pass filter and method of making t Diffraction grating type band-pass filter and method of making t

1998-07-23

2000-02-01

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 27, 385 28, G02B 634

Patent

active

06021242&

ABSTRACT:
A band-pass filter formed in an optical waveguide, provided with a diffraction grating group having a period .LAMBDA. of refractive index fluctuation changing in an axial direction with substantially a constant changing width .DELTA.n, comprises two periodic refractive index variable areas having periodes .LAMBDA. different from each other; a zero area, disposed therebetween, having substantially a constant refractive index; and boundary areas, disposed between the zero area and the respective periodic refractive index variable areas, in which the changing width of refractive index monotonously changes between 0 and .DELTA.n.

REFERENCES:
patent: 5887094 (1999-03-01), Bakhti et al.
patent: 5903690 (1999-05-01), Starodubov et al.
patent: 5953471 (1999-09-01), Espindola et al.
Mizrahi, et al., "Fiber-grating transmission filters for use in all-fiber demultiplexer", OFC '94 Technical Digest, pp. 52-53.

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