Patent ID: 7212707
Filing Date: 2007-05-01
Classification: G02B

Abstract:
1. A passively temperature-compensated optical grating device comprising: a support frame formed of a material exhibiting a relatively low coefficient of thermal expansion (CTE), said support frame including a floor bottom surface, a first fixed sidewall and a second fixed sidewall; a lever arm formed of a relatively low coefficient of thermal expansions (CTE) material fixed at a first end to a predetermined pivot point along the support frame bottom surface, a second, remaining end of said lever arm free to rotate about said pivot point; an optical fiber grating attached between said first fixed sidewall and said second, remaining end of said lever arm; and an expansion element formed of a material exhibiting a relatively high coefficient of thermal expansion (CTE), said expansion element coupled between the second, fixed sidewall and said lever arm, wherein changes in the dimensions of said high CTE expansion element as a function of temperature rotate said lever arm through a predetermined angle about said pivot point to modify the strain applied to said optical fiber grating and change the wavelength of said optical grating device.