Magnetically tunable optical fiber gratings

Details Magnetically tunable optical fiber gratings Magnetically tunable optical fiber gratings

1997-01-29

1998-07-14

Lee, John D.

Optical waveguides

With optical coupler

Input/output coupler

385 6, G02B 634

Patent

active

057816778

ABSTRACT:
In accordance with the invention, a tunable fiber grating comprises a fiber grating secured between a pair of magnets so that magnetic force (repulsive or attractive) applied to the magnets is transmitted to the grating. An electromagnet is disposed adjacent the magnets for applying the field to magnetize them. Control of the current applied to the electromagnet permits control of the force transmitted to the fiber grating and, thus, control of the grating strain, spacing and reflection frequency. In a preferred embodiment the electromagnet is actuated to produce magnetic pulses which control the remanent force between the two magnets, eliminating the need for continuous power. An add/drop multiplexer employing the tunable gratings is described.

REFERENCES:
patent: 5144690 (1992-09-01), Domash
patent: 5394488 (1995-02-01), Fernald et al.

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