Bandwidth superposition of linearly chirped microwave waveforms based on a Fourier domain mode-locked optoelectronic oscillator
- 22 October 2021
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 29 (22), 36977-36987
- https://doi.org/10.1364/oe.442723
Abstract
Optoelectronic oscillators (OEOs) are promising for radar, communication and electronic countermeasure systems. Among them, frequency-scanning OEOs with wide instantaneous bandwidth are needed for many advanced applications. In this work, we demonstrate a novel system to generate bandwidth-doubled linearly chirped microwave waveforms (LCMWs) based on bandwidth superposition using a Fourier domain mode-locked OEO (FDML OEO). In the proposed system, bandwidth-doubling is achieved by re-modulating the generated LCMW of the FDML OEO onto a frequency-scanning optical carrier signal with the help of an external Mach-Zehnder modulator. LCMWs with wide frequency scanning instantaneous bandwidth of 10 GHz are experimentally obtained. Meanwhile, these LCMWs are tunable in an ultra-wide frequency range from 1 to 39 GHz. Moreover, they are with high frequency sweep linearity of 0.5%. Our work presents a simple method to generate tunable wide-band LCMWs for potential microwave sources. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing AgreementFunding Information
- National Key Research and Development Program of China (2018YFB2201901, 2018YFB2201902, 2018YFB2201903)
- National Natural Science Foundation of China (61925505)
- Beijing Municipal Natural Science Foundation (Z210005)
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