| 摘要 |
<p>A method for manufacturing an optical waveguide refractive index grating having a desired grating pitch Λ. The method includes the step of providing a photosensitive waveguide and a writing beam of actinic radiation, the writing beam having an intensity. The waveguide is translated relative to the writing beam at a velocity v(t). The intensity of the writing beam is modulated as a function of time at a frequency f(t), wherein: formula (I). The f(t) step of modulating the intensity of the writing beam as a function of time at a frequency f(t) including the step of varying Λ.</p> |
