Patent ID: 6795623
Filing Date: 2004-09-21
Classification: G02B,H01S

Abstract:
A resonant optical cavity (50) having a first part provided with a first waveguide (3, 3â€²) oriented along a longitudinal axis on which an origin of distances is defined, the cavity being defined between first and second reflectors (13â€², 40), the second of the reflectors being a variable pitch Bragg reflector grating (40) on said first waveguide (3, 3â€²), said grating (40) of the second reflector having one end (41) near the first reflector (13â€², 40â€²) and one end farther away from the first reflector, and a parameter CS of variation of the Bragg wavelength defined as the derivative at a point on the reflector grating (40) of the Bragg wavelength &lgr;B at that point with respect to the distance between that point and the origin having a given value, the optical cavity being characterized in that said value of the parameter CS and the position of said grating (40) relative to the origin are such that the cavity (50) formed between said first reflector (13â€², 40â€²) and said second reflector (40) resonates continuously from a first optical frequency to a second optical frequency higher than the first optical frequency.