| 摘要 |
PCT No. PCT/GB98/01761 Sec. 371 Date Nov. 5, 1998 Sec. 102(e) Date Nov. 5, 1998 PCT Filed Jun. 17, 1998 PCT Pub. No. WO98/59269 PCT Pub. Date Dec. 30, 1998A multiple band pass optical filter comprises an interferometer, such as a Michelson interferometer, with de-tuned reflective Bragg gratings 8, 9 that produce multiple, separate, substantially equal reflectivity pass bands for light passing from the interferometer's input port P1 to output port P2.
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