Patent ID: 6510256
Filing Date: 2003-01-21
Classification: G01J,G02F

Abstract:
A method of establishing transmission of light through a light guiding structure incorporating a chirped Bragg-reflector, comprising the steps of:directing light into an input end of said light guiding structure, and sending a longitudinal acoustic pulse into said light guiding structure for propagation along the same, the acoustic pulse being such that, for each location of said acoustic pulse in said Bragg-reflector, the reflectivity for a wavelength associated with said location in said Bragg-reflector is altered, and said acoustic pulse having a first part and a second part, said first part causing a temporary increase of the local grating period of the chirped Bragg-reflector, and said second part causing a temporary decrease of the local grating period of said Bragg-reflector.