Tunable frequency-multiplying optoelectronic oscillator based on a dual-parallel Mach-Zehnder modulator incorporating a
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Vol.16 No.6, 1 November 2020
Tunable frequency-multiplying optoelectronic oscillator based on a dual-parallel Mach-Zehnder modulator incorporating a phase-shifted fiber Bragg grating* ZHANG Yao (ᕐ⪦)1, NING Ti-gang (ᆱᨀ㓢)1, LI Jing (ᵾᲦ)1, ZHENG Jing-jing (䜁ᲦᲦ)1, LIU Ling (ࡈ⧢)1, DONG Xiao-wei (㪓ሿՏ)2, and PEI Li (㼤ѭ)1** 1. Key Lab of All Optical Network & Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China 2. College of Information Engineering, North China University of Technology, Beijing 100144, China1 (Received 12 October 2019; Revised 17 December 2019) ©Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2020 A tunable frequency-multiplying optoelectronic oscillator (OEO) based on a dual-parallel Mach-Zehnder modulator (DPMZM) is proposed and experimentally demonstrated. In the proposed system, the tunable fundamental microware signal is generated by a tunable optoelectronic oscillator incorporating a phase-shifted fiber Bragg grating (PS-FBG). By adjusting the DC bias of the DPMZM, the frequency-doubled microwave signal with a tunable frequency range from 11 GHz to 20 GHz and the frequency-quadrupled microwave signal with a tunable frequency range from 22.5 GHz to 26 GHz are generated. The phase noises of the fundamental, frequency-doubled and frequency-quadrupled signals at 10 kHz offset frequency are −105.9 dBc/Hz, −103.3 dBc/Hz and −86.2 dBc/Hz, respectively. Document code: A Article ID: 1673-1905(2020)06-0405-5 DOI https://doi.org/10.1007/s11801-020-9172-4
As an important branch of microwave photonics, the optoelectronic oscillator (OEO) due to its high frequency and low phase noise[1] has been widely used for aerospace, radar, communications[2], etc. It is important for a variety of applications, including optical communications[3], radio over fiber system[4], and optical sampling system[5]. For example, an OEO can be used to achieve clock recovery in an optical communication[6]. In order to obtain high frequency and flexible tunability, much research has been performed. The microwave photonic filter breaks the constraint of the electric filter in the original OEO structure, and it makes the frequency tuning range wider[7-9]. The frequency of the OEO is mainly limited by the bandwidth of the components in OEO feedback loop. To extend the frequency range of the OEO, several kinds of frequency-multiplying OEO have been presented[10-15]. In Ref.[12], the Mach-Zehnder modulator (MZM) and two polarization rotators are used to achieve frequency multiplication with a simple structure. However, the frequency generated by the scheme proposed in Ref.[12] is not adjustable and quadruple. In Ref.[13], a frequency-multiplying OEO incorporating the polarization modulator and phase modulator for high
frequency generation with a large frequency range is proposed. In this system, the optical carrier is removed by an optical notch filter. However, in order to achieve the tunability of the microwave signal freq
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