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Updated: Jun 30, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Simple and highly accurate technique for time delay measurement in optical fibers by free-running laser configuration
Ke Yun1, Jing Li, Guangxiao Zhang
1Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China. keyun@stanford.edu
Abstract:
A novel and simple technique for the measurement of time delay in the optical fiber by a free-running laser is proposed and demonstrated. The fiber to be measured was spliced to an erbium-doped fiber so as to form a ring-cavity laser. The mode beating frequency of the laser was measured to determine the round-trip time delay. This precise and efficient technique has an accuracy of 10(-8) for a fiber length of 100 km and of 10(-6) for a several-meters-long one.
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