4.7 Article

Microwave Photonic PS-Pulse and 140 GHz RF Comb Generator

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 41, Issue 11, Pages 3533-3538

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2023.3251112

Keywords

Radio frequency; Optical fiber dispersion; Masers; Photodetectors; Frequency measurement; Optical attenuators; Optical pulses; FS-pulse laser; high-speed photodetectors; microwave photonics; optical frequency combs; pulse distribution over fiber

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A microwave photonic RF comb generator is developed by combining an fs-pulse laser and a high-speed broadband photodetector module. The generated pulses have a FWHM of 5.8 ps and a flat RF comb up to 140 GHz. The capability of pulse distribution over fiber is also investigated, and the dispersion of the single mode fiber is managed using an optical bandpass filter.
A microwave photonic RF comb generator is presented by combining an fs-pulse laser and a high-speed broadband photodetector module. The subsystem generates pulses with a FWHM of 5.8 ps and a flat RF comb up to 140 GHz. Furthermore, the capability of pulse distribution over fiber is investigated. The dispersion of the single mode fiber is managed by using an optical bandpass filter, because reducing the optical spectral width limits the pulse broadening. With this scheme, the electrical pulse shape remains constant up to 500 m of fiber transmission. For a demonstration with 1500 m of fiber, the optical bandpass filter dispersion management results in a tradeoff between minimum electrical pulse width and fiber length.

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