Tunable optical filter has a polarization separating extractor with transmission or reflection diffraction grating and reconfigurable Bragg unit

摘要

A tunable optical filter has a polarization separating extractor (DE) with transmission or reflection diffraction grating (RD) and reconfigurable Bragg unit whose pitch is modified by acousto-, electro- or magneto-optic or Kerr effect direct optical scribing, photo refractive, carrier generation, optical amplification or thermal effects.