Adjustable attenuator for optical transmission system

Details Adjustable attenuator for optical transmission system Adjustable attenuator for optical transmission system

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.

REFERENCES:
patent: 3529897 (1970-09-01), Pfaffenberger
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.

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