A Directly Modulated Laterally Coupled Distributed Feedback Laser Array Based on SiO₂ Planarization Process

• Main Authors: Qichao Wang, Jian Wang, Changzheng Sun, Bing Xiong, Yi Luo, Zhibiao Hao, Yanjun Han, Lai Wang, Hongtao Li, Jiadong Yu
• Format: Article
• Language: English
• Published: MDPI AG 2021-12-01
• Series: Applied Sciences
• Subjects: laterally coupled gratings; high-speed modulation; SiO₂ Planarization; 1.3 μm; distributed feedback laser
• Online Access: https://www.mdpi.com/2076-3417/11/1/221
• ISSN: 2076-3417

Low-cost and high-speed single-mode semiconductor lasers are increasingly required as wide-band access fiber communication expands in recent years. Here, a high-speed laterally coupled distributed feedback (LC-DFB) laser array is achieved based on a SiO₂ planarization process. The device exhibits low threshold currents of about 12 mA and high slope efficiencies over 0.26 W/A. Stable single mode operation and high-speed performance are realized with side mode suppression ratios (SMSR) over 45 dB, and 3-dBe bandwidths exceed 14 GHz for all four channels. Such a high-speed and process simple LC-DFB laser array shows great potential to the low-cost fiber communication networks.