Ultra-wideband doublet signal generation with tunable notch band based on delay-line filter. Issue 8 (23rd May 2020)

• Record Type: Journal Article
• Authors: Du, Cong; Liu, Fangming; Ding, Yujiao; Wu, Kai; Li, Baohua; Dong, Wei
• Is Part Of: Journal of electromagnetic waves and applications. Volume 34:Issue 8(2020)
• Page Start: 1047
• Page End: 1056
• Publication Date: 2020-05-23
• Subjects: Ultra-wideband -- delay-line filter -- notch band -- phase modulation intensity modulation conversion; Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2020.1772889
• Languages: English
• ISSNs: 0920-5071

Abstract

ABSTRACT: A novel and simple scheme to generate Ultra-wideband (UWB) doublet signal with tunable notch band based on a tunable delay-line filter is presented. The first-order differentiation is realized by a dual-drive Mach–Zehnder modulator (DD-MZM), which differentiates the Gaussian pulses to the monocycle pulses. Subsequently, the UWB monocycle pulses are transmitted to an optical delay-line filter implemented by a balanced photo-detector and a tunable delay line for both differentiation and photodetection. Consequently, the desired UWB doublet signal can be obtained with a 10-dB bandwidth of 8.75 GHz. Besides, the polarity reversibility of the generated doublet signal is demonstrated by changing the bias voltage of the DD-MZM. Moreover, the desired notch can be introduced in the generated frequency spectrum to eliminate the interference between the existing narrowband systems and the UWB systems. And the tunability of the band-notched position is implemented by simply adjusting the delay time of the delay-line filter. The feasibility of the presented scheme is investigated by mathematical models and simulations.