Title :
A Continuously Tunable Microwave Fractional Hilbert Transformer Based on a Photonic Microwave Delay-Line Filter Using a Polarization Modulator
Author :
Li, Ze ; Chi, Hao ; Zhang, Xianmin ; Yao, Jianping
Author_Institution :
Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada
Abstract :
A continuously tunable microwave fractional Hilbert transformer (FHT) implemented based on a photonic microwave delay-line filter is proposed and demonstrated. The photonic microwave delay-line filter with negative coefficients is realized based on polarization-modulation using a polarization modulator (PolM) and polarization-modulation to intensity-modulation conversion in an optical polarizer. The tunability of the fractional order is achieved by tuning the coefficient of the zeroth tap. An FHT with a tunable order from 0.3 to 1 is demonstrated. The accuracy of the FHT is evaluated; a phase deviation less than 5° within the passband is achieved.
Keywords :
Hilbert transforms; band-pass filters; intensity modulation; light polarisation; microwave filters; microwave photonics; optical delay lines; optical filters; optical modulation; optical polarisers; optical tuning; continuously tunable microwave fractional Hilbert transformer; intensity-modulation conversion; negative coefficients; optical polarizer; optical tuning; pass-band filter; phase deviation; photonic microwave delay-line filter; polarization modulator; polarization-modulation; Bandwidth; Microwave filters; Microwave imaging; Microwave photonics; Optical fiber filters; Hilbert transform; microwave photonics; optical signal processing; photonic microwave delay-line filter;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2166255
