Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2005-04-05
2005-04-05
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Input/output coupler
C385S122000, C359S573000, C359S575000
Reexamination Certificate
active
06876792
ABSTRACT:
The present invention relates to a precision phase mask for forming diffraction grating in optical fiber and optical waveguide, to provide them with nonlinear chirped grating for dispersion compensation use and having low fluctuation or crosstalk in the group delay characteristics. The diffraction grating is formed by means of interference fringe between diffracted lights of different orders, in which the cycle of the diffraction grating20increases nonlinearly, wherein plurality of diffraction gratings G1, G2, G3. . . having different cycles are assembled on a plane in increasing order of the cycle with the directions of the diffraction gratings directed to the same direction, and assembled in such a manner that, where the cycle of grating changes nonlinearly and discontinuously, the regions having larger rate of change of the cycle contain proportionally more discontinuous phases per unit length.
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Apodised in-fibre Bragg grating reflectors photoimprinted using a phase mask, B. Malo, S. Theriault, D,C. Johnson, F. Bilodeau, J. Albert and K.O. Hill, Electronics Letters, 2nd Feb. 1995, vol. 31, No. 3, P223-225.
Malo et al, “Apodised in-fibre Bragg grating reflectors photoimprinted using a phase mask”, Electronics Letters, vol. 31, No. 3, Feb. 1995, pp. 223-225.
Fujimoto Shigekazu
Inui Tetsuro
Komukai Tetsuro
Kurihara Masa-aki
Dai Nippon Printing Co. Ltd.
Dellett & Walters
El-Shammaa Mary
Font Frank G.
Nippon Telegraph and Telephone Corporation
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