Magnetically controlled variable optical attenuator

Details Magnetically controlled variable optical attenuator Magnetically controlled variable optical attenuator

1998-06-15

2000-07-04

Ullah, Akm E.

Optical waveguides

Accessories

Attenuator

G02B 600

Patent

active

060850167

ABSTRACT:
Magnets are used to control the amount of coupling loss between fibers. The fiber ends are attached to magnets and by controllably magnetizing the magnets, the fibers can be pulled apart or brought closer together to vary the amount of coupling loss. Preferably at least one of the magnets is latchable. The advantage of the latchable version is that a predetermined amount of loss can be latchably set by magnetizing the magnets to a particular level and afterwards no additional power is required to maintain the amount of attenuation. This is advantageous compared to other approaches in which power is required continuously to maintain a particular loss level.

REFERENCES:
patent: 3651322 (1972-03-01), Elliot
patent: 4257671 (1981-03-01), Barbaudy et al.
patent: 4261640 (1981-04-01), Stankos et al.
patent: 4645294 (1987-02-01), Oguey et al.
patent: 4701021 (1987-10-01), Le Pesant
patent: 5097119 (1992-03-01), Breitmeier
patent: 5812304 (1998-09-01), Shirasaki et al.
patent: 5974216 (1999-10-01), Nakaya

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