Study on auto bias control of a silicon optical modulator in a four-level pulse amplitude modulation format

Chen Honggang; Zhang Bo; Ma Weidong; Hu Yi; Xiao Xi; Liang Xuerui; Hu Leilei; Li Feng; Ding Lan

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Study on auto bias control of a silicon optical modulator in a four-level pulse amplitude modulation format

机译：四级脉冲幅度调制格式中硅光调制器自动偏置控制研究

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Recently, the high-speed silicon optical modulator has played a greater and greater role in optic fiber communication. Due to the silicon material nonlinear electro-optic effect, the quadrature (Quad) bias point of the modulator is difficult to be locked precisely. In this paper, a novel automatic bias control (ABC) method for four-level pulse amplitude modulation format silicon modulator is presented. First, a sinusoidal dither signal is applied to the modulator DC bias, and the normalized output optical signal function, which is modulated by the dither signal, is obtained. Then, a pair of orthogonal reference functions is created, whose numerical size is equal to the absolute value of sinusoidal and cosine functions so that the frequency is the same as the dither signal. Through the cross-correlation integral operation between the normalized and reference functions above, we find that the zero point of the above integral operation is the best Quad bias point through numerical simulation and experiment. The phase accuracy error of ABC is lower than 2 deg, and it satisfies the business specifications of a high-speed silicon optical modulator. (C) 2019 Optical Society of America

机译：最近，高速硅光学调制器在光纤通信中发挥了更大和更大的作用。由于硅材料非线性电光效果，调制器的正交（四边形）偏置点难以精确地锁定。本文介绍了一种用于四级脉冲幅度调制格式硅调制器的新型自动偏置控制（ABC）方法。首先，将正弦抖动信号施加到调制器DC偏置，并且获得由抖动信号调制的归一化输出光信号功能。然后，创建一对正交的参考功能，其数值大小等于正弦和余弦功能的绝对值，使得频率与抖动信号相同。通过归一化和参考功能之间的互相关积分操作，我们发现上述整数操作的零点是通过数值模拟和实验的最佳四偏见点。 ABC的相位精度误差低于2°，满足高速硅光调制器的业务规范。（c）2019年光学学会

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来源
《Applied optics》 |2019年第15期|共9页
作者
Chen Honggang; Zhang Bo; Ma Weidong; Hu Yi; Xiao Xi; Liang Xuerui; Hu Leilei; Li Feng; Ding Lan;
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Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Wuhan Res Inst Posts Telecommun State Key Lab Opt Commun Technol &

Networks Wuhan 430074 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

Accelink Technol Co Ltd 1 Tanhu Rd Wuhan 430205 Hubei Peoples R China;

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Study on auto bias control of a silicon optical modulator in a four-level pulse amplitude modulation format

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