Photonic Generation of Background-Free Phase-Coded Pulses With Low Power Fluctuation Over the Multi-Octave Frequency Range
Journal of Lightwave Technology(2023)
摘要
In this article, a photonic microwave signals generation scheme for background-free phase-coded (PC) radar pulse with multioctave tuning is experimentally demonstrated. Firstly, an optical frequency comb (OFC) demultiplexing technology based on optical injection locking (OIL) provides a power-equalized coherent optical local oscillator (LO) with ultra-broadband tuning capability. Then, a phase-modulated optical signal is produced based on the conversion intensity modulation to phase modulation. Finally, a background-free phase-coded signal can be obtained by beating the optical signal with LO at a balanced photodetector (BPD). The proposed scheme features a flat frequency response over an ultra-wideband frequency range without needing a broadband modulator and radio frequency (RF) synthesizer. A proof-of-concept experiment demonstrates that the power fluctuation of 0.5 Gbps background-free PC pulses is lower than 3.12 dB within 3 similar to 24 GHz carrier frequency. Furthermore, the pulse compression performance and system stability are investigated, respectively.
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关键词
Optical filters,Optical pulses,Optical modulation,Optical attenuators,Frequency modulation,Optical mixing,Optical feedback,Microwave photonics signal generation,optical frequency comb demultiplexing,multi-octave frequency range,optical injection locking
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