Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1992-12-23
1994-05-03
Lerner, Martin
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 24, 359569, 385 37, G02B 518, G02B 532, G02B 634, G03H 128
Patent
active
053092600
ABSTRACT:
An improved method for forming a Bragg grating in a photosensitive, optical waveguiding medium by exposure to an interference pattern formed by overlapping beams of actinic radiation. When Bragg gratings are formed according to methods of the prior art, these gratings tend to exhibit reflectivity spectra having, in addition to a central peak, a generally undesirable series of subsidiary peaks. These subsidiary peaks are caused by a wave interference effect. The inventive method modifies or eliminates the subsidiary peaks by spatially modulating the average refractive index of the grating, or by spatially modulating the grating period.
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Mizrahi Victor
Sipe John E.
AT&T Bell Laboratories
Finston Martin I.
Lerner Martin
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