Magnetostrictively tunable optical fiber gratings

Details Magnetostrictively tunable optical fiber gratings Magnetostrictively tunable optical fiber gratings

1997-01-29

1998-09-22

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 6, 385 12, 385 8, 385 15, 385 16, 385 24, 359115, 359127, 359130, G02B 634, H04J 1400

Patent

active

058127119

ABSTRACT:
In accordance with the invention, a tunable fiber grating comprises a fiber grating secured to a magnetostrictive body so that magnetostrictive strain will be transmitted to the grating. An electromagnet is disposed adjacent the magnetostrictive body for applying a magnetic field along the body. Control of the current applied to the electromagnet permits control of the strain transmitted to the fiber grating, and thus control of the grating spacing and reflection frequency. In a preferred embodiment the magnetostrictive body is cylinder bonded along the grating. In alternative arrangements, the magnetostrictive effect can be mechanically amplified. An add/drop multiplexer employing the tunable gratings is described.

REFERENCES:
patent: 5394488 (1995-02-01), Fernald et al.
patent: 5600473 (1997-02-01), Huber
patent: 5608825 (1997-03-01), Ip
patent: 5680489 (1997-10-01), Kersey

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