Adaptive bias control of optical IQ modulator with low LFM dither and strong fluctuation resistance

• DOI: 10.1364/oe.503490
• Publication Date: 2023-11-17T08:00:09Z
• Authors: Zheli Liu; Mingming Zhang; Weihao Li; Zihe Hu; Junda Chen; Can Zhao; Li Wang; Ming Tang
• Keywords: Dither; SIGNAL (programming language)

An innovative approach has been proposed for adaptive bias control in optical IQ modulators. In contrast to traditional approaches that utilize sine dither, this method employs a linear frequency modulated (LFM) signal as the associated with fractional Fourier Transform (FrFT) extract point drift. The LFM signal, after undergoing FrFT, transforms into compressed (CS) energy concentration domain. Utilizing monitoring, demonstrates robust even presence of substantial interferences, substantiated by comprehensive simulations and experimental investigations. Remarkably, 20-Gbaud 16QAM transmission, achieves stable over 4 hours, voltage fluctuations, while effectively reducing dither amplitude half. Furthermore, it maintains low bit error rate (BER) below 10