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Highlights: [•] A wideband tunable optoelectronic oscillator based on microwave attenuator is realized. [•] The generated microwave frequency could be tuned from 5.81GHz to 11GHz. [•] The phase noise of generated microwave signal could reach −107.4dBc/Hz@10kHz. [ABSTRACT FROM AUTHOR]

A novel method to photonic generation multiband ultra-wide band (MB-UWB) impulse radio signal based on the summation of multiple doublet pulses with different weights and proper time delays is proposed. Microwave sinusoidal signal is used to amplitude modulate a tunable laser to get multi-wavelength source. The optical signal is then phase modulation with Gaussian pulse and fed into a section of single-mode fiber (SMF). The SMF services as phase modulation to intensity modulation (PM-IM) conversion to generate Gaussian doublet pulse, and offers proper time delays to Gaussian doublet pulses with different weights. MB-UWB pulses with sidelobe suppression levels over 25 dB, central frequency from 5 to 8 GHz, 10 dB bandwidth from 2.9 to 3.8 GHz are obtained in experiment. [ABSTRACT FROM AUTHOR]