Title :
Tunable Photonic Microwave Notch Filter With Negative Coefficient Based on Polarization Modulation
Author :
Kim, Tae-Young ; Oh, Choong Keun ; Kim, Sun-Jong ; Park, Chang-Soo
Author_Institution :
Dept. of Inf. & Commun., Gwangju Inst. of Sci. & Technol.
fDate :
6/15/2007 12:00:00 AM
Abstract :
A novel tunable photonic microwave notch filter with negative and positive coefficients is proposed and experimentally demonstrated. The coefficients can be achieved by polarization modulation along with an electrical signal. The two polarization-modulated signals, which have a relative time delay, are combined, and detected by a photodetector. The transfer response of the filter shows a very stable operation irrespective of the coherence length of the source used. Moreover, the free spectral range of the filter, which shows a sharp notch, can be changed by using a tunable differential group delay generator over the range of 3.16-4.31 GHz
Keywords :
birefringence; microwave filters; microwave photonics; notch filters; optical fibre polarisation; optical filters; optical modulation; 3.16 to 4.31 GHz; coherence length; differential group delay generator; electrical signal; high-birefringence fiber; negative coefficient; notch filter; photodetector; photonic microwave filter; polarization modulation; time delay; transfer response; tunable filter; Delay effects; Digital modulation; Microwave filters; Optical fiber filters; Optical fiber polarization; Optical filters; Optical modulation; Optical sensors; Optical wavelength conversion; Semiconductor optical amplifiers; High birefringence (Hi-Bi) fiber; microwave notch filters; photonic microwave filters (PMFs); polarization modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.898753
