16 March 2021 Tunable parabolic pulses generation by mapping transmissivity curve of Mach–Zehnder modulator to time domain
Chao Wei, Yang Jiang, Rong Wang, Hongfang Liu, Qiang Yu, Xiangping Chen, Jing Tian
Author Affiliations +
Abstract

A simple scheme of tunable parabolic pulses generation is proposed. Mathematically, a parabolic function is a quadratic function, which is equivalent to a sine-squared function when the independent variable is small enough. Since the transmissivity curve of Mach–Zehnder modulator is exactly a sine-squared function, bright parabolic pulse or dark parabolic pulse can be obtained that a linear drive signal with small voltage is used to map a center range of the peak or valley of the curve to the time domain. Starting from a sinusoidal signal, the second-order approximation triangular signal is simply obtained and used as a drive signal. By setting the bias point appropriately, parabolic pulses with the same or double frequency as the drive signals can be generated. Theoretical analysis and simulation are given. In the experiment, full-duty-cycle parabolic pulses at 2, 3, and 4 GHz and corresponding frequency-doubled pulses are obtained, which are consistent with the theoretical expectations.

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2021/$28.00 © 2021 SPIE
Chao Wei, Yang Jiang, Rong Wang, Hongfang Liu, Qiang Yu, Xiangping Chen, and Jing Tian "Tunable parabolic pulses generation by mapping transmissivity curve of Mach–Zehnder modulator to time domain," Optical Engineering 60(3), 036105 (16 March 2021). https://doi.org/10.1117/1.OE.60.3.036105
Received: 21 December 2020; Accepted: 22 February 2021; Published: 16 March 2021
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Cited by 1 scholarly publication.
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KEYWORDS
Modulators

Optical engineering

Modulation

Polarization

Beam splitters

Phase shift keying

Signal generators

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