Dither-Free Quad- and Null-Bias Point Locking Technique for Mach-Zehnder Silicon Optical Modulator

Jiekui Yu; Honggang Chen; Bo Zhang; Yuan Cheng; Yong Luo; Xuerui Liang; Leilei Hu

doi:10.3788/AOS202242.2023003

Acta Optica Sinica, Volume. 42, Issue 20, 2023003(2022)

Dither-Free Quad- and Null-Bias Point Locking Technique for Mach-Zehnder Silicon Optical Modulator

Jiekui Yu¹, Honggang Chen^1、*, Bo Zhang¹, Yuan Cheng¹, Yong Luo¹, Xuerui Liang^1,2, and Leilei Hu¹

Author Affiliations

¹Accelink Technologies Co. Ltd., Wuhan 430205, Hubei , China

²Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430205, Hubei , China

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Figures & Tables(12)

Fig. 1. Model diagram of MZ silicon optical modulator (inphase-MPD and outerphase-MPD)

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Fig. 2. Simulation curves of outerphase-MPD photocurrent, inphase-MPD photocurrent and normalized ratio under different normalized bias powers. (a) Simulation curves of outerphase-MPD photocurrent and inphase-MPD photocurrent; (b) simulation curve of normalized ratio

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Fig. 3. Simulation results of $K_{s l o p e_N u l l} (V_{b i a s})$ and $I_{Q u a d} (V_{b i a s})$

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Fig. 4. Flow chart of closing-loop locking for Null bias point

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Fig. 5. Flow chart of closing-loop locking for Quad bias point

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Fig. 6. Test platform for Quad bias point control algorithm in MZ silicon optical modulator

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Fig. 7. Measured results of locking performance for Quad point under PAM4 modulation format. (a) Test curves of outerphase-MPD photocurrent, inphase-MPD photocurrent and normalized photocurrent under different powers of thermo-optical phase shifter; (b) calculated results of $K_{s l o p e_N u l l} (V_{b i a s})$ and $I_{Q u a d} (V_{b i a s})$

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Fig. 8. PAM4 eye diagrams under cases of $V_{b i a s}$ =1.477 V, $V_{b i a s}$ =1.357 V and corrected by proposed algorithm. (a) $V_{b i a s}$ =1.477 V; (b) $V_{b i a s}$ =1.357 V; (c) corrected by proposed algorithm

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Fig. 9. Simulation verification platform for Null point locking algorithm in MZ silicon optical modulator

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Fig. 10. Simulation results of locking performance for Null point under BPSK modulation format. (a) $V_{b i a s}^{2} / P_{π}$ and $K_{s l o p e_N u l l} (V_{b i a s})$ varying with iteration number; (b) BPSK constellation diagram under $V_{b i a s}^{2} / P_{π}$ =0.8; (c) BPSK constellation diagram under $V_{b i a s}^{2} / P_{π}$ =0.9; (d) BPSK constellation diagram under $V_{b i a s}^{2} / P_{π}$ =0.99

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Table 1. Phase shift and absorption loss coefficients of upper and lower arms for MZ silicon optical modulator
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Table 1. Phase shift and absorption loss coefficients of upper and lower arms for MZ silicon optical modulator
Index DC component 1st order coefficient 2nd order coefficient 3rd order coefficient
Phase shift 0.0130 0.9152 -0.1255 0.0144
Absorption loss 1.2087 -0.0912 0.0131 -0.0016

Table 2. Measured parameters of PAM4 eye diagram system under cases of $V_{b i a s}$ =1.477 V, $V_{b i a s}$ =1.357 V and corrected by proposed algorithm
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Table 2. Measured parameters of PAM4 eye diagram system under cases of $V_{b i a s}$ =1.477 V, $V_{b i a s}$ =1.357 V and corrected by proposed algorithm
$V_{b i a s}$ /V Average optical power /dBm OMA /dBm ER /dB TDECQ
1.477 2.12 3.217 6.799 >5.00
1.357 -0.94 -1.356 4.192 2.95
1.407-1.427 （corrected by proposed algorithm） 1.09 0.550 4.102 2.05

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Jiekui Yu, Honggang Chen, Bo Zhang, Yuan Cheng, Yong Luo, Xuerui Liang, Leilei Hu. Dither-Free Quad- and Null-Bias Point Locking Technique for Mach-Zehnder Silicon Optical Modulator[J]. Acta Optica Sinica, 2022, 42(20): 2023003

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Paper Information

Category: Optical Devices

Received: Feb. 24, 2022

Accepted: May. 10, 2022

Published Online: Oct. 18, 2022

The Author Email: Chen Honggang (honggang.chen@accelink.com)

DOI:10.3788/AOS202242.2023003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Phase shift and absorption loss coefficients of upper and lower arms for MZ silicon optical modulator

Table 1. Phase shift and absorption loss coefficients of upper and lower arms for MZ silicon optical modulator

Table 2. Measured parameters of PAM4 eye diagram system under cases of Vbias=1.477 V, Vbias=1.357 V and corrected by proposed algorithm

Table 2. Measured parameters of PAM4 eye diagram system under cases of Vbias=1.477 V, Vbias=1.357 V and corrected by proposed algorithm

Table 2. Measured parameters of PAM4 eye diagram system under cases of $V_{b i a s}$ =1.477 V, $V_{b i a s}$ =1.357 V and corrected by proposed algorithm

Table 2. Measured parameters of PAM4 eye diagram system under cases of $V_{b i a s}$ =1.477 V, $V_{b i a s}$ =1.357 V and corrected by proposed algorithm