Simple and highly accurate technique for time delay measurement in optical fibers by free-running laser configuration |
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| Authors: | Yun Ke Li Jing Zhang Guangxiao Chen Lingling Yang Weijian Zhang Zhigang |
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| Affiliation: | Institute 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 |
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| 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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