Pulse control of frequency and width for a real-time independently adjustable laser source

• Published in: Frontiers of information technology & electronic engineering Vol. 22; no. 10; pp. 1379 - 1389
• Main Authors: Yang, Zhiwei, Wu, Xu, Ouyang, Deqin, Zhang, Encheng, Sun, Huibin, Ruan, Shuangchen
• Format: Journal Article
• Language: English
• Published: Hangzhou Zhejiang University Press 01-10-2021; Springer Nature B.V; College of Sino-German Intelligent Manufacturing,Shenzhen Technology University,Shenzhen 518118,China%College of Sino-German Intelligent Manufacturing,Shenzhen Technology University,Shenzhen 518118,China%Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,College of Physics Science and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China; Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,College of Physics Science and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China
• Subjects: Circuit design; Communications Engineering; Computer Hardware; Computer Science; Computer Systems Organization and Communication Networks; Continuous radiation; Electrical Engineering; Electronics and Microelectronics; Instrumentation; Lasers; Networks; Optical pulses; Real time; Semiconductor lasers; 电子设计自动化及方法; Electronic design automation and methodology; 光脉冲产生; 光控制; 电参数控制; Electric variable control; TN78; Optical pulse generation; Optical control
• ISSN: 2095-9184; 2095-9230
• DOI: 10.1631/FITEE.2000294

A set of semiconductor laser pulse seed sources based on an embedded chip is proposed. The greatest feature is that the optical pulse frequency and width can be independently adjusted in real time. The pulse seed sources can be switched independently and online from the gain-switched mode to the quasi-continuous wave mode to obtain optimal optical parameters for specific applications. To explore the physical mechanism of the semiconductor laser source, the rate equation that describes the carrier-photon transient change in a semiconductor laser cavity is numerically derived and solved. Subsequently, problems that need to be considered while designing the drive circuit are identified. The system evaluation indicates that the optical pulse frequency adjustment range is 250 Hz to 42 MHz, and the narrowest optical pulse output width is 80 ps. The pulse seed source can drive semiconductor lasers with different central wavelengths (1064, 1550, and 1970 nm), and can also simultaneously drive two semiconductor lasers and output dual-band optical pulses. It can be used as a seed source for general high-power optical systems, and exhibits good application value and extensive market prospects.