Low phase noise and quasi-tunable millimeter-wave generator using a passively InAs/InP mode-locked quantum dot laser
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Vol.16 No.6, 1 November 2020
Low phase noise and quasi-tunable millimeter-wave generator using a passively InAs/InP mode-locked quantum dot laser* LIU Li (ࡈѭ)1**, LIU Yang-guang (ࡈԠ)ݹ1, ZHANG Xiao-min (ㄐᲃ)1, LIU Bang-quan (ࡈ䛖ᵳ)1, and ZHANG Xiu-pu (ᕐ⿰Პ)2 1. College of Digital Technology and Engineering, Ningbo University of Finance & Economics, Ningbo 315175, China 2. Department of Electrical and Computer Engineering, Concordia University, Montreal QC H3G 1M8, Canada (Received 22 January 2020; Revised 22 March 2020) 1 ©Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2020 A low phase noise millimeter-wave (MMW) signal generator is proposed and experimentally demonstrated with a C-band passively Fabry-Pérot (F-P) quantum dot mode-locked laser. A novel method is proposed to generate low phase noise MMW signal, which is simply based on a commercial off-the-shelf dual-driven LiNbO3 Mach-Zehnder modulator and a passively F-P quantum dot mode-locked laser. MMW signal with the frequency of 30 GHz, 45 GHz and 90 GHz respectively is obtained experimentally. Single-sideband phase noise of the 30 GHz and 45 GHz MMW signal is −112 dBc/Hz and −106 dBc/Hz at an offset of 1 kHz, respectively. The linewidth of the 30 GHz and 45 GHz MMW signal is about from 225 Hz and 239 Hz. This is considered a very simple MMW generator with a quasi-tunable broadband and ultra-low phase noise. Document code: A Article ID: 1673-1905(2020)06-0441-5 https://doi.org/10.1007/s11801-020-0016-z DOI
The rapidly development of the millimeter-wave (MMW) and terahertz (THz) technology has promoted multi-domain research application, such as radio-over-fiber (RoF) optical wireless networks, mobile communication systems, satellite telecommunications and spectroscopy, etc[1-3]. High-quality MMW generator is one of the most crucial elements, which has a significant impact on the other components of the system. Low phase noise and high stable frequency are two important fundamental parameters, which determine the performance of an MMW generator, as the low phase noise determines the short-termpurity random drift of carrier phase, while the stable frequency determines MMW signal’s long-term consistency. Recent advances in photonics, especially in optical devices, can generate high frequency microwave millimeter-wave signals with very low phase noise[4,5]. Many schemes of low phase noise MMW signal photonic generation have been demonstrated[5-9]. Specially, we focus on mode-locking, optical heterodyning, dual-wavelength lasers and optical injection. Mode-locking technique can generate low phase noise MMW signals[5], yet it offers poor tunability as the gen*
erated frequency is determined by the laser’s fixed longitudinal mode spacing. Optical heterodyning[6] is a very flexible technique that allows the generation of tunable MMW signals from the GHz to the THz range with low phase correlation, while a MMW signal is generated at the difference frequency between the emissions of two free-running lasers. A dual-waveleng
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