INTEGRATED OPTICAL DEVICE, AND METHOD OF FORMATION

摘要

An integrated planar Bragg grating is fabricated by depositing layers of material onto a negative expansion substrate (100) to form a waveguide (120) , which is held in mechanical tension with the substrate (100). A Bragg gratin g (200) is then formed in the waveguide (120). As the temperature of the waveguide (120) increases, the mechanical tension between the waveguide (120 ) and the substrate (100) is relieved, such that the peak reflection wavelengt h of the Bragg grating (200) remains nearly constant.