Read/write system for optical disc apparatus with fiber optics

Details Read/write system for optical disc apparatus with fiber optics Read/write system for optical disc apparatus with fiber optics

1983-08-15

1986-04-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369 44, H01J 516

Patent

active

045815291

ABSTRACT:
A read/write system is disclosed for optical disc apparatus. The light source is removed from the head and optically coupled to the disc by a single-mode fiber which acts as a spatial filter. Adverse effects on the light source due to reflection from the disc are avoided by making the fiber length greater than one-half the coherence length of the source. A sparing switch and combiner component may be included in the system. An array of discrete light sources, each coupled to an associated fiber, may also be employed for multiple track accessing.

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patent: 4030122 (1977-06-01), Chemelli et al.
patent: 4107242 (1978-08-01), Runge
patent: 4135083 (1979-01-01), Van Alem et al.
patent: 4292260 (1981-09-01), Cheung
patent: 4337531 (1982-06-01), Willemsen
"Lightguide Theory and Its Implications in Manufacturing", The Western Electric Engineer, Jefferies et al., vol. 24, (Winter, 1980) pp. 13-23.
"Liquid Crystal Switching Components", Digest of Papers, Fiber Optical Conference, Soref (1980), pp. 21-25.
"High Performance Optical Reader for VideoDisc Substrates", RCA Review, Lurie et al., vol. 43 (Mar. 1982), pp. 128-166.
"Single Polarization Fiber", Abstracts of the 6th Topical Meeting on Optical Fiber Communications, Simpson et al., (Mar. 1983), pp. 32-33.

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