Articles and systems comprising digitally tunable optical gratin

Details Articles and systems comprising digitally tunable optical gratin Articles and systems comprising digitally tunable optical gratin

1998-08-28

2000-10-03

Ngo, Hung N.

Optical waveguides

With optical coupler

Input/output coupler

385 24, 385147, G02B 626

Patent

active

061284270

ABSTRACT:
The invention discloses digitally tunable optical grating device using force between switchable and nonswitchable magnets to reconfigure the mechanical strain, preferably a tensile strain, or gratings so that a pulse or short-duration current can induce a latchable change in grating periodicity. Preferred embodiments include fiber gratings with magnet gaps dimensioned for limiting the maximum strain applied to the grating and guides for providing strain without rotation or twisting. The magnets provide an accurately predetermined amount of strain and hence provide a latchable wavelength shift in the grating with a minimal amount of electrical power. The device is especially useful in WDM communication systems, particularly for adding or dropping channels and for dynamically equalizing amplifier gain.

REFERENCES:
patent: 5781677 (1998-07-01), Jin et al.
patent: 5999546 (1999-12-01), Esindola et al.
patent: 5999671 (1999-12-01), Jin et al.

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