Photonically Generated Frequency Hopped Linear Frequency Modulated Signal Using a DFB Laser

Nakarmi B. Bai Y. Fang C. Wang X. Nakarmi U. Ukaegbu I.A. Pan S.
15 October 2022 Institute of Electrical and Electronics Engineers Inc.

Journal of Lightwave Technology
2022 #40 Issue 20 6729 - 6736 pp.

Threats and security are critical issues in a multi-RADAR environment, which severely affect the performance metrics of a RADAR system, such as range resolution, false detection, and image quality. In a multi-RADAR environment, the issues of jamming, spoofing, and interferences should be considered for practical implementation. In this paper, we experimentally demonstrate a photonically generated frequency hopped linear frequency modulated (Ph-FHLFM) signal using injection locking in a DFB laser. For a proof of concept, we develop Ph-FHLFM with an eight-step and four-step hopping, each step having a bandwidth of 2 GHz and 1 GHz, respectively, and a total bandwidth of 8 GHz. The generated Ph-FHLFM signal detects two objects separated by 10, 5, and 2.5 cm with a maximum error of 3 mm. Further, for the proof of concept of the interference agility of the Ph-FHLFM signal, target objects are detected in the presence of an interferer, which is a conventional linear frequency modulated radar with the same/different bandwidths and chirps. Unlike in conventional LFM, the Ph-FHLFM signal overcomes the false detection and maintains a similar resolution in both scenarios, with and without an interferer.

Frequency hopping , interference , multi-radar environment , optical injection , semiconductor lasers

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Nanjing University of Aeronautics and Astronautics, Key Laboratory of Radar Imaging and Microwave Photonics and Ministry of Education, Nanjing, 210016, China
University of Arkansas, Department of Computer Science and Computer Engineering, Fayetteville, 72701, AR, United States
Nazarbayev University, Integrated Device Solutions and Nanophotonics (IDSN) Laboratory, School of Enginnering and Digital Sciences, Nur-Sultan, 010000, Kazakhstan

Nanjing University of Aeronautics and Astronautics
University of Arkansas
Nazarbayev University

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