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Length measurement of long optical fiber with sub-millimeter resolution
* 1 , 1, 2 , 1 , 1, 2 , 1, 2
1  Nanjing University of Aeronautics and Astronautics
2  Newkey Photonics Technologies Co., Ltd., China


Knowing the exact length of long optical fiber is of great importance to interferometry-based optical sensors, fiber-connected antenna arrays and other microwave photonic applications. This paper reviews recent efforts on long optical fiber length measurement with sub-millimeter resolution, including optical time domain reflectometers, optical frequency domain reflectometers, and optical backscatter reflectometers based on microwave frequency sweeping. Techniques to improve the measurement resolution and to reduce the measurement error are discussed.

Keywords: optical fiber; length measurement; microwave photonics