Research on Bias Point Control Technology for Array-Type Electro-Optical Modulators Based on Lithium Niobate (Invited)

Haoyang Zhang; Zuoxin Kuang; Guanyu Chen; Hua Yu

doi:10.3788/LOP241176

Laser & Optoelectronics Progress, Volume. 61, Issue 11, 1116007(2024)

Research on Bias Point Control Technology for Array-Type Electro-Optical Modulators Based on Lithium Niobate (Invited)

Haoyang Zhang, Zuoxin Kuang, Guanyu Chen, and Hua Yu^*

Key Laboratory of Optoelectronic Technology & System, Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China

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Figures & Tables(10)

Fig. 1. Modulation characteristics. (a) Common four operating points; (b) modulation characteristics of point +Q; (c) modulation characteristics of point min

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Fig. 2. Implementation plan of bias point control technology

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Fig. 3. Output optical power curve and first-order partial derivation curve of MZM

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Fig. 4. Block diagram of bias point controller hardware

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Fig. 5. Hardware circuit of control system. (a) PCB design drawing; (b) physical drawing

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Fig. 6. Flow diagram of overall software control logic

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Fig. 7. Block diagram of hardware experimental platform composition

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Fig. 8. Test results. (a) Optical power variation at any point; (b) optical power variation at point+Q; (c) PWM eye diagram without control circuit; (d) PWM eye diagram with control circuit

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Table 1. Criteria for distinguishing bias points

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Table 1. Criteria for distinguishing bias points

Category	First-order partial derivation
Category	Feature 1	Feature 2
+Q	$D_{V} = D_{m a x}$	—
-Q	$D_{V} = D_{m i n}$	—
Max	$D_{V} = 0$	$V_{D C} < V_{m a x}$ ， $D_{V} > 0$ $V_{D C} > V_{m a x}$ ， $D_{V} < 0$
Min	$D_{V} = 0$	$V_{D C} < V_{m i n}$ ， $D_{V} < 0$ $V_{D C} > V_{m i n}$ ， $D_{V} > 0$

Table 2. Results of output amplitude of electro-optical modulators
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Table 2. Results of output amplitude of electro-optical modulators
Category Output optical power /dBm
Maximum Minimum Difference
Arbitrary point 3.470 2.840 0.630
Max 3.910 3.870 0.040
+Q 1.979 1.930 0.049

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Haoyang Zhang, Zuoxin Kuang, Guanyu Chen, Hua Yu. Research on Bias Point Control Technology for Array-Type Electro-Optical Modulators Based on Lithium Niobate (Invited)[J]. Laser & Optoelectronics Progress, 2024, 61(11): 1116007

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