Title :
Continuously tunable photonic radio-frequency notch filter
Author :
Coppinger, F. ; Yegnanarayanan, S. ; Trinh, P.D. ; Jalali, B.
Author_Institution :
Optoelectron. Circuits & Syst. Lab., California Univ., Los Angeles, CA, USA
fDate :
3/1/1997 12:00:00 AM
Abstract :
We present a continuously tunable nonrecursive radio-frequency (RF) photonic filter. The filter provides fine tuning through the use of a novel RF phase shifter and coarse tuning using an an optical variable time delay. This architecture permits wide-band continuous tuning of the filter null frequency and is useful in applications such as moving target indication (MTI) in an airborne radar.
Keywords :
airborne radar; notch filters; optical filters; radar equipment; radiofrequency filters; RF phase shifter; airborne radar; moving target indication; nonrecursive filter; null frequency; optical variable time delay; photonic radiofrequency notch filter; wideband continuous tuning; Delay effects; Microwave filters; Optical attenuators; Optical fiber filters; Optical filters; Optical tuning; Phase shifters; Radio frequency; Spaceborne radar; Tunable circuits and devices;
Journal_Title :
Photonics Technology Letters, IEEE
