Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 41, Issue 6, Pages 1725-1733Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3225408
Keywords
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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This article experimentally demonstrates a photonic microwave signals generation scheme for background-free phase-coded (PC) radar pulse with multioctave tuning. 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. The 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 shows 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. The pulse compression performance and system stability are also investigated.
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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