Research of silicon photonic devices for optical communications

• Main Authors: Hsu, Yung, 徐雍
• Other Authors: Chow, Chi-Wai
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/7bfk53

博士 === 國立交通大學 === 光電工程研究所 === 107 === The bandwidth demands are increasing rapidly in recent years due to the introduction of new emerging services, such as 4K or 8K UHDTV, cloud computing, 5G mobile front-haul, etc. To meet these bandwidth demands, many solutions have been proposed, including the upgrade of communication systems and the employment of high efficient modulation formats. Among the solution proposed, silicon photonics technology is a promising candidate. Silicon photonics is compatible with CMOS processing that can integrate the optical elements into the silicon substrate and minimize the volume and power consume. Comparable with the same specification of electrical components, the fabrication of silicon photonics devices could be low-cost. This dissertation proposed the research of silicon photonic devices for optical communications. First of all, the background, motivation and characteristic of silicon photonics technology will be introduced. The advanced modulated signal formats which are employed in the dissertation are also involved, including OOK, PAM-4, and OFDM. In Chapter 2 to 5, we will introduce several key silicon photonic devices required in optical communication, including the applications of mode-division-multiplexer (MDM), silicon micro-ring modulator (SiMRM), silicon Mach Zehnder modulator (SiMZM), germanium-silicon photodetector (Ge-Si PD), and silicon micro-ring resonator (SiMRR). In Chapter 2, we will discuss a 3-channel MDM with multi-wavelength channels for high-speed transmission; the total data rate of 2.6 Tbit/s is achieved. This research has potential for the applications in data center or chip-level optical interconnect. In Chapter 3, we will discuss a silicon photonic modulator used in transmitter, and demodulation in the receiver by serval equalizers. There are four different equalizers used in this chapter, including Feed-Forward Equalizer (FFE), Decision Feedback Equalizer (DFE), Volterra, and Neural-Network (NN). Among these equalizers, the NN is one of the machine learning algorithms, was applied independently to the demodulation of SiMZM transmission case. This chapter also includes the introduction of the four equlaizers. Chapter 4 is the detection of Ge-Si PD in the receiver. Both the high-speed PAM-4 and OFDM modulation signal were used to detect by the Ge-Si PD. And Volterra equalizer was used to compensate the received signals. Chapter 5 is the research of SiMRR used in the cavity of fiber ring laser with the special design of fiber ring structure. There are two different structures of fiber ring laser in this chapter, and both of them could lase with tunable wavelength and stable single-longitudinal-mode. This dissertation proposed several key silicon photonic devices and with their applications in the optical communication, including transmission of high-speed modulation signal and compensation the received signal by different equalizers. Through this research, it is hoped that the applications of the silicon photonic in the optical communication could break through the traditional bottleneck limitation, and make the significantly improve in the transmission data rate of optical communication system.