Device for tuning wavelength response of an optical fiber gratin

Details Device for tuning wavelength response of an optical fiber gratin Device for tuning wavelength response of an optical fiber gratin

1997-10-27

1999-11-16

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 12, 385 31, 385141, 359115, 359124, 359130, G02B 634, H04J 1400

Patent

active

059872004

ABSTRACT:
A tunable fiber grating comprises a temperature-sensitive body secured to a fiber having a fiber grating region for transmitting thermally-induced strain to the grating. The amount of strain and hence the degree of wavelength tuning are controlled by adjusting the temperature of the temperature-sensitive body, wherein the extent of adjustment is preferably pre-determined according to feedback from a wavelength detector. Large thermal strains obtainable with the present invention allow a wide range of wavelength tuning with a relatively small and convenient temperature change near ambient temperature. In a preferred embodiment, the temperature-sensitive body is cylindrical and comprised of a nickel-titanium alloy bonded to the grating. In alternative arrangements, the thermal strain effect can be amplified. An add/drop multiplexer employing the tunable gratings is also described.

REFERENCES:
patent: 4996419 (1991-02-01), Morey
patent: 5007705 (1991-04-01), Morey et al.
patent: 5042898 (1991-08-01), Morey et al.
patent: 5367589 (1994-11-01), MacDonald et al.
patent: 5841920 (1998-11-01), Lemaire et al.

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