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High‐purity microwave signal generation using a low‐order harmonic‐suppressed rational harmonic mode‐locked fiber laser incorporating a Mach–Zehnder interferometer
Author(s) -
Fu Jiaojiao,
Gao Shiming
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25253
Subject(s) - harmonics , microwave , optics , signal (programming language) , harmonic , interferometry , filter (signal processing) , materials science , physics , engineering , acoustics , electrical engineering , telecommunications , computer science , voltage , programming language
A simple approach to generate high‐purity microwave signals based on a rational harmonic mode‐locked fiber laser is proposed and demonstrated by incorporating an external cavity Mach–Zehnder interferometer filter to suppress the low‐order harmonics.A pulse train of equal amplitude with a repetition rate of about 10 GHz, which is four times of the frequency of the microwave drive signal (∼2.5 GHz), is obtained. A high‐spectral purity microwave signal at 10 GHz can be achieved by beating the filtered rational harmonics at a photodetector. The signal‐to‐noise ratio of the generated microwave signal is about 20 dB enhanced compared with the filter‐free case. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1640–1645, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25253