An optical waveguide has a surface. An array of separately actuated bodies is disposed proximal to the exposed surface, and an actuator separately actuates at least some of the bodies to change a spectral characteristic of a wave propagating through the waveguide. Preferably, the bodies are metal striplines,...http://www.google.fr/patents/US7263258?utm_source=gb-gplus-shareBrevet US7263258 - Programmable optical grating device and method
