Photonic Generation of Frequency-Doubled Triangular-Shaped Waveforms Based on a PM-MZM Modulator
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Journal of Russian Laser Research, Volume 41, Number 5, September, 2020
PHOTONIC GENERATION OF FREQUENCY-DOUBLED TRIANGULAR-SHAPED WAVEFORMS BASED ON A PM-MZM MODULATOR Suiqun Li,∗ Xiang Gao, Hongyan Li, and Xinrui Zhang School of Computer Science Sichuan University of Science and Engineering Zigong 643000, China ∗ Corresponding
author e-mail:
suiqun17 @ suse.edu.cn
Abstract We propose and experimentally demonstrate a simple and stable photonic approach of frequencydoubled triangular-shaped waveform generation. It mainly consists of an integrated polarizationmultiplexing Mach–Zehnder modulator (PM-MZM) and a balance photoelectric detector (BPD). Two PM-MZM sub-modulators work at the maximum transmission point. By properly setting the amplitude of the local oscillator (LO) signal, frequency-doubled triangular-shaped waveforms can be generated. We analyze the operational principle by theory and experiment. Experimental results show that, when the frequency of LO signal is set to 3, 4, and 5 GHz respectively, triangular-shaped waveform signals with different repetition rates of 6, 8, and 10 GHz are generated, which agree well with the theoretical prediction. The structure of this system is simple and compact. In addition, the system has high-frequency tunability and operating bandwidth due the absence of optical filters.
Keywords: photonic generation, triangular-shaped waveform, frequency doubling.
1.
Introduction
Microwave arbitrary waveform generator has been extensively studied in the past few years due to its wide application in RF communication field, radar signal detection, instrument measurement, and other fields [1–4]. However, due to the limitation of electronic devices, the repetition rates of the generated arbitrary waveforms by traditional methods are usually very small. The photon-assisted arbitrary waveform generation provides a new method for solving the limitations of electronic devices. As one of the classical waveforms, the triangular-shaped waveform has outstanding advantages over any other waveforms, especially in light intensity with the advantages of linear rising and falling edges. For instance, the triangular light wave has a higher average efficiency in all-optical wavelength conversion [5], and it is considered as the best choice for signal replication and optical pulse compression [6, 7]. So far, many schemes based on photonic technology have been proposed to generate triangular-shaped pulse, such as frequency-to-time mapping [8, 9], spectrum shaping [10], and external modulation. Comparing with other methods, external modulation is considered as an excellent solution due to its tunable frequency and full duty cycle of the generated triangular pulses. In the past few years, various methods for generating triangular-shaped waveforms have been verified based on external modulation, such as applying a phase modulator and an optical filter [11], using a Manuscript submitted by the authors in English on July 22, 2020. c 2020 Springer Science+Business Media, LLC 1071-2836/20/4105-0521
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