BIAS CONTROL DEVICE AND METHOD BASED ON PULSE PHASE STABILIZATION FOR MACH-ZEHNDER MODULATOR

Abstract: the present disclosure discloses a bias control device and method based on pulse phase stabilization for adaptive mach-zehnder modulator. the device includes a mode-locked femtosecond laser, a mach-zehnder modulator, an optical fiber coupler, a photodetector, an amplifying filter, an analog-to-digital converter, an fpga bias control module, a digital-to-analog converter, a bias amplifier, and an electrical pulse generator. the fpga bias control module demodulates the amplitude of the high-frequency signal to determine and output the initial bias value, setting the operating point of mzm at the null point. simultaneously, the low-frequency signal phase at this moment is demodulated as the target value and compared with the demodulated phase of the real-time updated low-frequency signal to generate an error signal. through pid, the bias voltage is adjusted in real time to achieve stability at the null point.

Inventor(s): Benyong CHEN, Jiandong XIE, Liping YAN, Ye LIN

CPC Classification: G02F1/0123 (for the control of the intensity, phase, polarisation or colour (, take precedence))

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