Xiangchuan Wang, Shupeng Li, Xin Jiang, Jintao Hu, Min Xue, Shangzhe Xu, Shilong Pan, "High-accuracy optical time delay measurement in fiber link [Invited]," Chin. Opt. Lett. 17, 060601 (2019)
- Chinese Optics Letters
- Vol. 17, Issue 6, 060601 (2019)
Fig. 1. Schematic diagram of a typical OTDR system. LD, laser diode; FUT, fiber under test; PD, photodetector.
Fig. 2. Structure of the OFDR system. TLS, tunable laser source; OC, optical coupler.
Fig. 3. Configuration of an all-fiber mode-locked laser for the measurement of the fiber length. WDM, wavelength-division multiplexer.
Fig. 4. Schematic diagram of the fiber transmission delay (FTD) measurement system. (a) FTD measurement loop. (b) System delay control (SDC) loop. TIC, time interval counter; VCO, voltage control oscillator; PLL, phase-locked loop; WDM, wavelength division multiplexer.
Fig. 5. Schematic diagram of typical phase-derived range measurement system. RF, radio frequency.
Fig. 6. Schematic diagram of the optical vector analyzer based on chirped optical double sideband (ODSB) modulation. MZM, Mach–Zehnder modulator; PMD, phase-magnitude detector.
Fig. 7. Schematic diagram of the optical microwave interferometer. MD, magnitude detector.
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Table 1. Comparison of the Measurement Systems
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