Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1989-09-21
1991-05-14
Healy, Brian
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350 9618, 350 9620, 350320, 350347V, 350350R, 428 1, 25229901, 252589, G02B 626, C09K 1900, C09K 1952, G02F 113
Patent
active
050150570
ABSTRACT:
A polarization insensitive optical attenuator (10,40) uses a polymer-dispersed liquid crystal (PDLC) film (14,56) to provide attenuation control over a wide range of attenuation values. The attenuator has a relatively low minimum attenuation and reliable light transmission with minimal insertion loss. The present invention is also adaptable for use with a temperature controller (200) that stabilizes the PDLC film, which promotes more uniform, predictable attenuation values.
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Eric G. Hanson, "Polarization-Independent Liquid Crystal Optical Attenuator for Fiber-Optics Applications", Applied Optics, vol. 21, No. 7, 1342 (1982).
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Bos Philip J.
Jones Michael D.
Rumbaugh Scott H.
Scheu Friedrich
Angello Paul S.
Healy Brian
Tektronix Inc.
Winkelman John D.
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