Title :
Ultra-Wideband Generation Based on Cascaded Mach–Zehnder Modulators
Author :
Yu, Yuan ; Dong, Jianji ; Li, Xiang ; Zhang, Xinliang
Author_Institution :
Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A simple approach to generating ultra-wideband (UWB) pulses with a single optical carrier is proposed and demonstrated. The approach is realized by using a single laser diode (LD) and two cascaded Mach-Zehnder modulators (MZMs). In the experiment, the two MZMs are biased at opposite slopes of their modulation curves respectively and the time delay between them is variable. Negative monocycle pulses with a center frequency of 4.3 GHz and a fractional bandwidth of 165%, and positive monocycle pulses with a center frequency of 4.3 GHz and a fractional bandwidth of 188% are generated, respectively. The feasibility of high order UWB pulses generation with a single optical carrier is also discussed.
Keywords :
optical modulation; optical pulse generation; semiconductor lasers; Mach-Zehnder modulators; UWB pulses generation; frequency 4.3 GHz; laser diode; negative monocycle pulses; optical carrier; positive monocycle pulses; ultra-wideband generation; ultrawideband pulse generation; Optical distortion; Optical fibers; Optical modulation; Optical pulses; Radio frequency; Counter-phase modulation; Mach–Zehnder modulator (MZM); in-phase modulation; ultra-wideband (UWB);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2169241
