Title :
Optimization of radio-on-fiber systems employing ODSB signals by utilizing a dual-electrode Mach-Zehnder modulator against IM3
Author :
Cho, Tae-Sik ; Kim, Kiseon
Author_Institution :
Dept. of Inf. & Commun., Gwangji Inst. of Sci. & Technol., South Korea
fDate :
5/1/2006 12:00:00 AM
Abstract :
In this letter, the third-order intermodulation (IM3) due to the dual-electrode Mach-Zehnder modulator for generating optical double-sideband (ODSB) signals is analyzed by incorporating fiber dispersion. The resulting signal-to-noise and distortion ratio (SNDR) at appropriate input power is additionally investigated in order to optimize the performance of the entire system. It is observed that the power of IM3 is seen to degrade faster than that of the fundamental power as fiber dispersion increases. Thus, SNDR for ODSB signals increases due to the fiber dispersion, until the power of IM3 is greater than that of the additive noise level. Thus, the optimum power of the input signal is found to be sensitive to the fiber dispersion while the optimum SNDR is found to be independent of fiber dispersion.
Keywords :
Mach-Zehnder interferometers; intermodulation distortion; microwave photonics; optical fibre dispersion; optical modulation; optical noise; radio-over-fibre; ODSB signals; additive noise; dual-electrode Mach-Zehnder modulator; fiber dispersion; optical double-sideband; radio-on-fiber systems; third-order intermodulation; Degradation; Intermodulation distortion; Optical distortion; Optical fiber communication; Optical fiber dispersion; Optical filters; Optical modulation; Optical noise; RF signals; System performance; Mach–Zehnder modulator; optical double-sideband (ODSB); optical fiber dispersion; optimization; signal-to-noise and distortion ratio (SNDR); third-order intermodulation (IM3);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.873353
