Magnetostrictive wavelength-shifting devices and optical communi

Details Magnetostrictive wavelength-shifting devices and optical communi Magnetostrictive wavelength-shifting devices and optical communi

1998-09-24

2000-09-19

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 31, 385123, 372 6, 359130, 359341, G02B 634, H01S 330, H04J 1402

Patent

active

061224219

ABSTRACT:
A programmable and latchable device for wavelength shifting and chromatic dispersion compensating is disclosed. An optical grating such as a Bragg grating, a nonchirped grating, or a linearly or non-linearly chirped grating, is magnetostrictively strained to alter the dispersion compensator characteristics. In a preferred embodiment, a gradient magnetostrictive body is bonded along its length to the fiber grating. In yet another preferred embodiment, a magnetostrictive body is bonded onto the length of the fiber grating, and a gradient generating, programmable and latchable magnet component is placed adjacent the magnetostrictive body. The body is then latchably strained to a desired level by controlling the extent of magnetization in the magnetostrictive material and the magnet so as to induce or enhance chirping characteristics in the grating. Various optical applications using such are disclosed.

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patent: 5812711 (1998-09-01), Glass et al.
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patent: 5999546 (1999-12-01), Espindola et al.
patent: 5999671 (1999-12-01), Jin et al.
Cruz J L et al: "Fibre Bragg Grantings Tuned and Chirped Using Magnetic Fields" Electronics Letters, GB, IEE Stevenage, vol. 33, No. 3, pp. 235-236 XP000725938 ISSN: 0013-5194 *the whole document*.
Hill P C et al: "Strain Gradient Chirp of Fibre Bragg Grantings" Electronics Letters, GB, IEEE, Stevenage, vol. 30, No. 14, pp. 1172-1174.

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