Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-10-19
2000-12-05
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, H01J 4014
Patent
active
061570257
ABSTRACT:
A disk shaped tunable optical filter is formed by a transparent substrate in a disk shape, and a filter layer formed on a top surface of the substrate, having such a filter characteristic that a transmission central wavelength varies along a circumferential direction as a monotonic function of a viewing angle. This disk shaped tunable optical filter can be advatageously utilized in realizing a wavelength discrimination apparatus, a reference wavelength light generation apparatus, an optical packet generation apparatus, and a tunable optical filter module, which are also disclosed.
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Abe Hiroshi
Aida Kazuo
Katagiri Yoshitada
Kawai Shingo
Nagaoka Shinji
Le Que T.
Nippon Telegraph and Telephone Corporation
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