Title :
Ultrawide Tunable Microwave Photonic Notch Filter Based on Stimulated Brillouin Scattering
Author :
Zhang, Weiwei ; Minasian, Robert A.
Author_Institution :
Inst. of Photonics & Opt. Sci., Univ. of Sydney, Sydney, NSW, Australia
fDate :
7/15/2012 12:00:00 AM
Abstract :
A new ultrawide tunable microwave photonic notch filter that exhibits a very high resolution is presented. It is based on a stimulated Brillouin scattering technique, which processes the modulation sidebands generated by a dual-drive Mach-Zehnder modulator. Tuning is realized by changing the drive frequency to an electro-optic intensity modulator. Experimental results demonstrate a high-resolution notch filter with a 3-dB bandwidth of 82 MHz, a notch depth of over 40 dB, a flat passband from near DC to 20 GHz with very low ripples, and a notch frequency that can be continuously tuned with shape invariance over an ultrawide frequency range from 2 to 20 GHz.
Keywords :
Mach-Zehnder interferometers; electro-optical filters; electro-optical modulation; intensity modulation; microwave filters; notch filters; stimulated Brillouin scattering; bandwidth 82 MHz; dual-drive Mach-Zehnder modulator; electro-optic intensity modulator; frequency 2 GHz to 20 GHz; microwave photonic notch filter; modulation sidebands; stimulated Brillouin scattering; ultrawide tunable filter; Amplitude modulation; Microwave filters; Microwave photonics; Optical fiber filters; Resonator filters; Scattering; Microwave filters; microwave photonics; notch filters; stimulated Brillouin scattering (SBS);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2198638
