摘要 |
PCT No. PCT/GB93/00043 Sec. 371 Date Jun. 15, 1994 Sec. 102(e) Date Jun. 15, 1994 PCT Filed Jan. 11, 1993 PCT Pub. No. WO93/14424 PCT Pub. Date Jul. 22, 1993An optical grating includes a sequence of grating lines, the sequence being such that each grating line is centered on a position which is an integer multiple of a line spacing distance from a datum position on the grating, the sequence of grating lines is non-periodic and the sequence of grating lines is formed from N concatenated subsequences. Each subsequence includes a series of one or more instances of a respective grating line pattern. Such an optical grating has a structure that is more amenable to calculation of the grating lines necessary to achieve a desired characteristic. A method of calculating and fabricating such a grating is also disclosed. |
申请人 |
BRITISH TELECOMMUNICATIONS P.L.C., LONDON, GB |
发明人 |
WOOD, DAVID, CHARLES MORDEN VILLA, WOODBRIDGE SUFFOLK IP12 1AX, GB;CASSIDY, STEPHEN, ANTHONY 79 HUMBER DOUCY LANE, SUFFOLK IP4 3WU, GB;WILKINSON, MARK, ROBERT 57 BLADEN DRIVE, SUFFOLK IP4 5UA, GB;MCKEE, PAUL, FRANCIS 2 CELANDINE COURT, COLCHESTER ESSEX CO4 5UQ, GB |