Optical attenuator using an optical fiber and method and apparat

Details Optical attenuator using an optical fiber and method and apparat Optical attenuator using an optical fiber and method and apparat

1992-04-02

1994-06-14

Lee, John D.

Optical waveguides

Accessories

Attenuator

385146, 385123, G02B 610

Patent

active

053217900

ABSTRACT:
An optical attenuator comprising an optical fiber and at least a light attenuating portion disposed on the optical fiber. The light attenuating portion is formed such that a part of the optical fiber is heated by an opposing pair of discharge electrodes or gas burners and then compressed in the axial direction to provide a spherically contoured light attenuating portion or pulled in the axial direction to provide a light attenuating portion having a reduced diameter. In addition, a method and an apparatus for producing an optical fiber of the foregoing type are disclosed. The method is practiced by way of the steps of heating a part of an optical fiber and then physically deforming the heated part to serve as a light attenuating portion by compressing or pulling it in the axial direction. The apparatus includes as essential components a stationary clamp jig, and a movable clamp jig arranged opposite to the stationary clamp jig and an opposing pair of discharge electrodes or gas burners for heating a part of the optical fiber. The movable clamp jig is displaced toward or away from the stationary clamp jig by rotationally actuating a micrometer.

REFERENCES:
patent: 4557557 (1985-12-01), Gleason et al.
patent: 4763976 (1988-08-01), Nolan et al.
patent: 4957343 (1990-09-01), Sato et al.
patent: 5044716 (1991-09-01), Berkey
patent: 5054874 (1991-10-01), Hill et al.
patent: 5171345 (1992-12-01), Takemura

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