Patent ID: 6148128
Filing Date: 2000-11-14
Classification: G02B,G02F,H01S

Abstract:
A passively temperature-compensated, wavelength-tunable optical grating device comprising:a support frame for supporting a length of optical waveguide, the support frame comprising material or structure with a negative coefficient of thermal expansion;an optical waveguide grating comprising a length of optical waveguide including an optical grating, the waveguide attached to the support frame on opposite sides of the grating;a movable body for pushing or pulling laterally on the waveguide to elastically flex the waveguide and induce a tensile strain therein, thereby altering the resonant wavelength of the grating;the device having a length which is not more than 50% longer than the grating length and the grating, when attached to the frame, having a temperature-dependent wavelength change of less than 0.002 nm/deg. C.