A Microwave Photonics Equalizer for Overcoming Dispersion-Induced Distortions on Wideband Signals in Radio-Over-Fiber Links

Release time:2023-05-08  Hits:

• DOI number:10.1109/JLT.2018.2879483
• Journal:JOURNAL OF LIGHTWAVE TECHNOLOGY
• Abstract:Chromatic dispersion (CD) has been considered as a significant issue that needs to he addressed over the past decades. Nowadays, as the bandwidth of radio frequency signals has expanded to multi-gigahertz, CD becomes increasingly troublesome for some wideband signals such as linear frequency modulated waveform (LFMW), which requires a flat amplitude response and a linear phase response. In this paper, we first investigate the CD-induced amplitude distortion and phase distortion that a wideband signal will suffer in traditional double-sideband (DSB) modulated and single-sideband (SSB) modulated radio-over-fiber (RoF) links with an emphasis on the LFMW. The detrimental impacts of the CD-induced distortions are subsequently discussed based on the pulse compression performance. Then, a two-tap microwave photonics equalizer (MPE) model is proposed and its operating principle for overcoming the CD-induced distortions is demonstrated. Based on the model, we design the MPE, which is mainly composed of an integrated dual-polarization dual-parallel Mach-Zehnder modulator and a differential group delay module. In the proofof-concept experiment, the RoF link utilizing the proposed MPE is built, and a 1-10 GHz LFMW is transmitted over the 66.3-km single-mode fiber. Thanks to the MPE, both CD-induced amplitude distortion and phase distortion are successfully compensated. Pulse compression results show that the pulse, compared with the signal transmitted in the SSB-haled link.
• First Author:Han, Guanyu, Li, Shangyuan,wang, Haojie, Xue, Xiaoxiao, Zheng, Xiaoping
• Indexed by:J
• Document Type:Article
• Volume:37
• Issue:3
• Page Number:736
• ISSN No.:0733-8724
• Translation or Not:no