Efficient Synthesis of Broadband Linear Frequency-Modulated Quadrature Signals for Coherent Electro-Optical Sensor Systems
Schmidt M, Carlowitz C (2024)
Publication Type: Conference contribution
Publication year: 2024
Journal
Publisher: Institute of Electrical and Electronics Engineers Inc.
Pages Range: 257-260
Conference Proceedings Title: IEEE MTT-S International Microwave Symposium Digest
Event location: Washington, DC
ISBN: 9798350375046
DOI: 10.1109/IMS40175.2024.10600286
Abstract
This paper presents a novel approach to efficiently generate broadband, complex baseband, linear, frequency-modulated quadrature signals for driving quadrature mach-zehnder-modulators. In contrast to conventional approaches based on high sampling rate arbitrary waveform generators, cost and complexity is significantly reduced, while coherent distance and motion sensing is retained through single-sideband optical modulation. By using two FMCW synthesizers with contrary sweep rates and frequency crossing at half sweep duration, a zero-IF frequency ramp with unlimited relative bandwidth can be generated through I/Q-downconversion. Furthermore, sweep rate and bandwidth of the frequency ramp are doubled with this method compared to a single synthesizer. for experimental verification, an FMCW signal with 10 GHz bandwidth and a ramp duration of 32 μs has been generated using two 13-18 GHz PLL-based synthesizers. Coherent optical frequency domain ranging measurements at 1550 nm with different fiber lengths exhibit similar performance in terms of resolution and sensitivity compared to a two-channel 12 GS/s laboratory-grade AWG.
Authors with CRIS profile
Marius Schmidt
Lehrstuhl für Hochfrequenztechnik (LHFT)
Christian Carlowitz
Lehrstuhl für Hochfrequenztechnik (LHFT)
Additional Organisation(s)
How to cite
APA:
Schmidt, M., & Carlowitz, C. (2024). Efficient Synthesis of Broadband Linear Frequency-Modulated Quadrature Signals for Coherent Electro-Optical Sensor Systems. In IEEE MTT-S International Microwave Symposium Digest (pp. 257-260). Washington, DC, US: Institute of Electrical and Electronics Engineers Inc..
MLA:
Schmidt, Marius, and Christian Carlowitz. "Efficient Synthesis of Broadband Linear Frequency-Modulated Quadrature Signals for Coherent Electro-Optical Sensor Systems." Proceedings of the 2024 IEEE/MTT-S International Microwave Symposium, IMS 2024, Washington, DC Institute of Electrical and Electronics Engineers Inc., 2024. 257-260.
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