Patent ID: 6728038
Filing Date: 2004-04-27
Classification: G02B,Y10S

Abstract:
A bandpass filter comprising:a) a first optical cavity for receiving an optical signal beam, the first optical cavity comprising i) a first thin film spacer, and ii) a first pair of dielectric reflector stacks surrounding the first thin film spacer to define a first side and a second side; and b) a second optical cavity having a first side disposed toward and in optical communication with the second side of said first optical cavity to provide a transmission bandwidth BW defined between the wavelengths at which the transmission decreases by 3 dB, the second optical cavity comprising; i) a second thin film spacer, and ii) a second pair of dielectric reflector stacks surrounding the second thin film spacer, c) wherein the filter characteristic has a transmission T with a single maximum within BW and continuously decreasing transmission across the BW from the maximum, and has a maximum ripple in group delay (GD) over BW less than about 1 ps.