Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 41, Issue 19, Pages 6142-6148Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2023.3282992
Keywords
Frequency modulation; Encoding; Optical polarization; Bandwidth; Optical modulation; Microwave oscillators; Phase modulation; Fourier domain mode-locked optoelectronic oscillator; linearly frequency modulated signal; multifunctional radar system; phase coding; pulse compression
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Phase-coded linearly frequency modulated (LFM) signals are crucial in enhancing radar performance and exploring wireless communication. By launching a phase-coded signal into an optoelectronic oscillator (OEO), a phase-coded LFM signal can be generated with adjustable center frequency, bandwidth, coding pattern, and bit rate.
Phase-coded linearly frequency modulated (LFM) signals play essential roles in enhancing the performance of radar as well as exploring wireless communication. To generate phase-coded LFM signals, we propose to launch a phase-coded signal into an optoelectronic oscillator (OEO). When the OEO is Fourier domain mode-locked (FDML), a phase-coded LFM signal is generated. The center frequency, bandwidth, coding pattern, and bit rate of the generated signals can be flexibly adjusted. In the experiment, a phase-coded LFM microwave signal with a bandwidth of 5.0 GHz is generated, corresponding to a time bandwidth product (TBWP) of 2.8 x 10(5). The center frequency and bandwidth of the generated signals are adjusted from 9.7 to 10.7 GHz and from 5.0 to 3.0 GHz, respectively. Meanwhile, different coding patterns and rates are also implemented, indicating that the phase-coded LFM signal can be used in wireless communications. The proposed approach can potentially be applied to multifunctional integration in radar.
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