An Integrated OFDR System Using Combined Swept-Laser Linearization and Phase Error Compensation
Date of Original Version
This article describes a flexible, compact, semiconductor laser (SCL)-based optical frequency-domain reflectometry (OFDR) design, incorporating swept-laser linearization functions (both passive and active), in situ phase error evaluation function, and phase error compensation function. At the core of the proposed design, a fiber-optic Mach-Zehnder interferometer (MZI) and its electronic digitization components (photodetector and zero-cross circuit) simultaneously perform all the abovementioned functions. Benefitting from the unique digital design, this system combines all functions in a compact fashion without increasing complexity and overhead. Experimental results demonstrate enhanced accuracy using the integrated design compared with prior methods, as well as improved cost-effectiveness, reduced complexity, and optimized form factor.
IEEE Transactions on Instrumentation and Measurement
Yao, Zheyi, Thomas Mauldin, Zhenyu Xu, Gerald Hefferman, and Tao Wei. "An Integrated OFDR System Using Combined Swept-Laser Linearization and Phase Error Compensation." IEEE Transactions on Instrumentation and Measurement 70, (2021). doi:10.1109/TIM.2020.3011485.