Next Article in Journal
Investigation of the Young’s Modulus and the Residual Stress of 4H-SiC Circular Membranes on 4H-SiC Substrates
Previous Article in Journal
Comparison between Focused Electron/Ion Beam-Induced Deposition at Room Temperature and under Cryogenic Conditions
Open AccessArticle

Bias Controller of Mach–Zehnder Modulator for Electro-Optic Analog-to-Digital Converter

by Shuxin Shi 1,†, Jun Yuan 2,†, Qin Huang 1,†, Chongyu Shi 1, Xin Luo 1, Shan Lu 1, Pengfei Yuan 1, Hua Yu 1,* and Qiuqin Yue 3,*
1
Key Laboratory for Optoelectronic Technology &Systems, Ministry of Education of China, Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology, Chongqing University, Chongqing 400044, China
2
Science and Technology on Analog Integrated Circuit Laboratory, Chongqing 401332, China
3
Chongqing College of Electronic Engineering, Chongqing 401331, China
*
Authors to whom correspondence should be addressed.
Contributed equally to this work.
Micromachines 2019, 10(12), 800; https://doi.org/10.3390/mi10120800
Received: 9 October 2019 / Revised: 12 November 2019 / Accepted: 19 November 2019 / Published: 21 November 2019
(This article belongs to the Section A:Physics)
As one of the core devices for an electro-optic analog-to-digital converter (ADC), the Mach–Zehnder (MZ) modulator plays an important role, and the output stability of the MZ modulator has a decisive influence on the conversion accuracy of the ADC. This paper proposed a pilot tone-based method to stabilize the bias point of the modulator. This method could obtain the corresponding control voltage of the MZ modulator by adding a KHz-level dither tone to the bias end of the modulator and calculating the ratio of the first and second harmonic components. The experimental results showed that the output optical power of the modulator was stable at 3.2 dB when the bias point of the modulator was set at the orthogonal point. Moreover, the fluctuation range was not more than 0.15 dB, the first harmonic of the output signal was stable at 50.5 dB, and the fluctuation range was not more than 0.6 dB. The proposed bias controller based on the field programmable gate array (FPGA) and digital signal processing (DSP) can stabilize the modulator bias point at the orthogonal point and with a relatively high locking accuracy.
Keywords: electro-optic analog-to-digital converter (ADC); Mach–Zehnder (MZ) modulator; bias point controller; pilot tone-based method electro-optic analog-to-digital converter (ADC); Mach–Zehnder (MZ) modulator; bias point controller; pilot tone-based method
MDPI and ACS Style

Shi, S.; Yuan, J.; Huang, Q.; Shi, C.; Luo, X.; Lu, S.; Yuan, P.; Yu, H.; Yue, Q. Bias Controller of Mach–Zehnder Modulator for Electro-Optic Analog-to-Digital Converter. Micromachines 2019, 10, 800.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop