Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1990-08-13
1992-02-11
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
359234, 359236, G01N 2184, G05D 2500
Patent
active
050871226
ABSTRACT:
An improved variable rate attenuator (VOA) is disclosed, which is used in an optical signal transmission system for testing (and other) purposes. In an optical fiber data transmission system, the VOA can be used to determine how much attenuation of the light beam can be tolerated without causing excessive bit error rate (BER) in data transmission. The improved VOA is a blocker having a vane-like structure which is gradually rotated into a collimated beam to cause attenuation. Because the movement vector of the edge of the blocker perpendicular to the collimated beam gradually becomes less for a given increment of blocker rotation, resolution of the attenuation is improved.
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patent: 3901596 (1975-08-01), Vincent et al.
patent: 3963326 (1976-06-01), Buchert
patent: 4516827 (1985-05-01), Lance et al.
patent: 4560252 (1985-12-01), Mori
patent: 4591231 (1986-05-01), Kaiser et al.
patent: 4904044 (1990-02-01), Tamulevich
patent: 4925273 (1990-05-01), Maisenbacher et al.
Hakimi Hosain
Ostrander Frederick M.
Laser Precision Corporation
McGraw Vincent P.
Plante Thomas J.
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