DocumentCode :
775374
Title :
A tunable photonic microwave notch filter based on all-optical mixing
Author :
Wang, Jun ; Yao, Jianping
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont., Canada
Volume :
18
Issue :
2
fYear :
2006
Firstpage :
382
Lastpage :
384
Abstract :
A novel photonic microwave notch filter based on all-optical mixing using a single narrow-linewidth optical source is proposed. In the proposed filter, the optical carrier emitted from a laser source is externally intensity modulated by a subcarrier signal and then applied to a second intensity modulator, which is driven by a local radio-frequency (RF) source with a dc bias to suppress the even-order sidebands. Since the higher odd-order sidebands have a much lower power than the first-order sidebands, only two first-order sidebands are considered with the subcarrier signal transferred to the two sidebands via optical mixing. By using a linearly chirped fiber Bragg grating as a dispersive device to introduce time delays, a two-tap photonic microwave notch filter is realized. The tunability of the proposed filter is achieved by adjusting the frequency of the local RF signal. Based on the proposed architecture, a two-tap microwave notch filter with a free spectral range tunable from 2.1 to 4.2 GHz is experimentally demonstrated.
Keywords :
Bragg gratings; electro-optical modulation; intensity modulation; microwave filters; microwave photonics; notch filters; optical fibres; optical filters; optical tuning; all-optical mixing; even-order sideband suppression; intensity modulation; linearly chirped fiber Bragg grating; photonic microwave notch filter; subcarrier signal; time delays; tunability; Intensity modulation; Microwave devices; Microwave filters; Optical fiber filters; Optical filters; Optical mixing; Optical modulation; Radio frequency; Stimulated emission; Tunable circuits and devices; All-optical mixing; chirped Bragg grating; electrooptic intensity modulator; photonic microwave notch filter;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2005.861961
Filename :
1564162
Link To Document :
بازگشت