Bias Controller of Mach–Zehnder Modulator for Electro-Optic Analog-to-Digital Converter
| Autor: | Huang Qin, Jun Yuan, Hua Yu, Shuxin Shi, Xin Luo, Chongyu Shi, Shan Lu, Pengfei Yuan, Qiuqin Yue |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Software_OPERATINGSYSTEMS
electro-optic analog-to-digital converter (ADC) Physics::Instrumentation and Detectors lcsh:Mechanical engineering and machinery Analog-to-digital converter Optical power 02 engineering and technology 01 natural sciences Signal Article law.invention 010309 optics Computer Science::Hardware Architecture 020210 optoelectronics & photonics law Control theory Hardware_GENERAL 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electronic engineering Hardware_INTEGRATEDCIRCUITS lcsh:TJ1-1570 Dither Electrical and Electronic Engineering Hardware_ARITHMETICANDLOGICSTRUCTURES Digital signal processing pilot tone-based method Physics Hardware_MEMORYSTRUCTURES business.industry Mechanical Engineering Electro-optic modulator Mach–Zehnder (MZ) modulator Control and Systems Engineering Harmonic business bias point controller |
| Zdroj: | Micromachines Volume 10 Issue 12 Micromachines, Vol 10, Iss 12, p 800 (2019) |
| ISSN: | 2072-666X |
| Popis: | As one of the core devices for an electro-optic analog-to-digital converter (ADC), the Mach&ndash 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. |
| Databáze: | OpenAIRE |
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