Manuscript received August I. 1994;
revised October 21. 1994. This work was supported by the Oftice of Naval Research. The authors are with Code 5672;
Optical Sciences Division. Naval Research Laboratory;
Washington;
DC 20375-5338 USA. IEEE Log Number 9407954;
D O I:
10.1109/68.345919
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
A fiber-optic finite impulse response filter with continuously tunable unit time delays is developed and studied. The filter consists of eight taps with progressively longer segments of high-dispersion fiber, but completed with dispersion-shifted fiber to nominally identical overall lengths. The time delays through each tap are tuned by varying the wavelength of the optical carrier. The constructed 8-tap filter exhibits bandpass characteristics with a Q of 30. The bandpass band is continuously tuned over a full octave from under 9 GHz to over 18 GHz with a single low-voltage control signal that demonstrates the technique's applicability to adaptive systems.