Passively temperature-compensated wavelength-tunable device comp

Details Passively temperature-compensated wavelength-tunable device comp Passively temperature-compensated wavelength-tunable device comp

1998-09-28

2000-11-14

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 16, 385 19, 372 20, 359130, 359341, G02B 634

Patent

active

061481289

ABSTRACT:
In accordance with the invention, a passively temperature-compensated tunable optical grating device comprises a grating, which is fixed at both ends to a support frame, and is mechanically or magnetically flexed so that a tensile strain induced in the grating reconfigures the resonant wavelength of the grating. Preferred embodiments include at least one waveguide grating, a flexing mechanism capable of inducing a latchable change in grating periodicity and at least one negative thermal expansion component which, upon heating, reduces the strain in the grating so that the temperature-induced wavelength shift is substantially cancelled out. The device can reduce the temperature-dependent wavelength change to less than 0.5 nm/100 deg. C, and preferably less than 0.05 nm/100 deg. C. In a preferred embodiment, the packaging assembly also includes a fine-wavelength adjusting mechanism for post-assembly corrective tuning. The device is especially useful in WDM communication systems, particularly for adding or dropping channels, for dynamically gain-equalizing optical amplifiers, for tunable lasers, and for dispersion compensation.

REFERENCES:
patent: 5999546 (1999-12-01), Espindola et al.
patent: 6055348 (2000-04-01), Jin et al.

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