| 摘要 |
<p>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 grating (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 wavelength of the Bragg grating (200) remains nearly constant.</p> |
