Magnetically reconfigurable optical grating devices and communic

Details Magnetically reconfigurable optical grating devices and communic Magnetically reconfigurable optical grating devices and communic

1998-02-06

2000-10-31

Ngo, Hung N.

Optical waveguides

With optical coupler

Input/output coupler

385 24, G02B 634

Patent

active

061414700

ABSTRACT:
The invention is a reconfigurable optical grating device using force from programmable magnets to alter the mechanical strain, preferably a tensile strain, on the gratings so as to induce a latchable change in grating periodicity using a pulse or short-duration current. It includes apparatus for limiting the maximum strain applied to the grating so that the fiber does not fracture, and it provides strain without rotation or twisting of the fiber grating. In preferred embodiment it provides control of magnetic force so as to accurately obtain a predetermined amount of strain and hence wavelength shift in the grating with a minimal amount of electrical power. The inventive structure is useful, e.g. for wavelength division multiplexed optical communication system comprising wavelength channel add/drop devices and/or dynamically gain-equalized amplifiers.

REFERENCES:
patent: 5007705 (1991-04-01), Morey et al.
patent: 5781677 (1998-07-01), Jin et al.
patent: 5812711 (1998-09-01), Glass et al.

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