Bulk internal bragg gratings and optical devices

摘要

The present invention provides photonic devices utilized in optical telecommunications. The photonic devices include photosensitive bulk glass bodies which contain Bragg gratings, particularly with the ultraviolet photosensitive bulk glass bodies directing optical telecommunications wavelength range bands. Preferably the ultraviolet photosensitive bulk glass bodies are batch meltable alkali boro-alumino-silicate bulk glass bodies. The invention includes an optical communications wavelength device for use with wavelength range bands, with the device comprising an input optical waveguide collimator for collimating an input light beam out of an optical waveguide to provide an unguided input light beam including at least one reflective wavelength range band lambdR and at least one wavelengths range band lambdn; an internal bulk Bragg grating including a transparent photosensitive bulk optical grating medium with an internal modulated refractive index grating with a grating pattern for reflecting the at least one wavelength range band lambdR; at least one output coupler for outputting an at least one output wavelength range band; and a substrate structure for securing said bulk Bragg grating relative to the input collimator and the output coupler, with the bulk Bragg grating disposed in the unguided input light beam wherein the at least one wavelengths range band lambdn is transmitted through the bulk Bragg grating and the at least one wavelength range band lambdR is reflected by the bulk Bragg grating.