An Automatic Bias Voltage Control Technique for High-order Modulation Formats

HUANG Jia-qi; JIN Xin; WU Jin-yang; WANG Yuan-xiang; YANG Qi; DAI Xiao-xiao

doi:10.13756/j.gtxyj.2022.06.004

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An Automatic Bias Voltage Control Technique for High-order Modulation Formats

更新时间：2023-01-29

- An Automatic Bias Voltage Control Technique for High-order Modulation Formats
- Study on Optical Communications Issue 6, Pages: 22-26(2022)
- 作者机构：
  
  a.华中科技大学　光学与电子信息学院，武汉　430074
  b.华中科技大学　网络空间安全学院，武汉　430074
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2022.06.004
  CLC： TN929
- Published：10 December 2022，
  
  Received：10 April 2022，
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HUANG Jia-qi, JIN Xin, WU Jin-yang, et al. An Automatic Bias Voltage Control Technique for High-order Modulation Formats. [J]. Study on Optical Communications (6):22-26(2022)
DOI：

HUANG Jia-qi, JIN Xin, WU Jin-yang, et al. An Automatic Bias Voltage Control Technique for High-order Modulation Formats. [J]. Study on Optical Communications (6):22-26(2022) DOI： 10.13756/j.gtxyj.2022.06.004.

摘要

为了维持发射机的稳定，以保证输出信号的质量，文章提出了一种新型的基于导频的自动偏压控制方案，可用于高阶调制格式。文章所提方案要求向调制器加载正交导频，并将经过移频的本振光与调制器输出的信号光相拍以实现相干探测。通过相关运算并监测相关系数值的方式，实现对偏置电压的控制。此方案将相干探测和相关检测技术结合，可有效提高系统的灵敏度，并通过仿真对此方案在高阶调制系统中的可行性以及对灵敏度的提升进行了充分验证。

Abstract

In order to maintain the stability of the transmitter to ensure the quality of the output signal

we propose a novel technique of automatic bias control based on the pilot signal that can be used in high-order modulation formats. The proposed scheme requires loading a pair of orthogonal pilot signals to the modulator and tapping the frequency-shifted local oscillation light with the signal light output from the modulator to achieve coherent detection. The control of the bias voltage is achieved by means of correlation operation and monitoring the value of the correlation coefficient. This scheme combines coherent detection and correlation detection techniques

which can effectively improve the sensitivity and control accuracy of the system. The feasibility of this scheme in high-order modulation systems and the improvement of sensitivity are also fully verified by simulation.

关键词

同相正交调制器偏压控制高阶调制相关检测相干探测

Keywords

in-phase quadrature modulatorbias controlhigh-order modulationcorrelation detectioncoherent detection

references

Terayama M, Okamoto S, Kasai K, et al. 4 096QAM (72 Gbit/s) Single-carrier Coherent Optical Transmission with a Potential SE of 15.8 bit/s/Hz in All-Raman Amplified 160 km Fiber Link[C]//Optical Fiber Communication Conference. San Diego, California, USA: Optical Society of America, 2018: Th1F. 2.

Cho P S, Khurgin J B, Shpantzer I. Closed-loop Bias Control of Optical Quadrature Modulator[J]. IEEE Photonics Technology Letters, 2006, 18(21): 2209-2211.

Cho P S, Nazarathy M. Bias Control for Optical OFDM Transmitters[J]. IEEE Photonics Technology Letters, 2010, 22(14): 1030-1032.

Kawakami H, Yoshida E, Miyamoto Y. Asymmetric Dithering Technique for Bias Condition Monitoring in Optical QPSK Modulator[J]. Electronics Letters, 2010, 46(6): 430-431.

Kawakami H, Yoshida E, Miyamoto Y. Auto Bias Control Technique based on Asymmetric Bias Dithering for Optical QPSK Modulation[J]. Journal of Lightwave Technology, 2012, 30(7): 962-968.

Li X, Deng L, Chen X, et al. Modulation-Format-Free and Automatic Bias Control for Optical IQ Modulators based on Dither-Correlation Detection[J]. Optics Express, 2017, 25(8): 9333-9345.

Zhu M, Zhang H, Li L. Low Noise Arbitrary Bias Point Control Technique of IQ Mach-Zehnder Modulator[C]//Asia Communications and Photonics Conference. Chengdu, China: Optical Society of America, 2019: M4A.71.

Gui T, Li C, Yang Q, et al. Auto Bias Control Technique for Optical OFDM Transmitter with Bias Dithering[J]. Optics Express, 2013, 21(5): 5833-5841.

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