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Schematic diagram for stabilizing the wavelength variation in WSL: (a) experimental setup of a WSL based on a FFP-TF; (b) structure of the closed-loop control; and (c) experimental setup for measuring the temperature change signal by placing the FBG in a temperature chamber. (WSL: wavelength-swept laser; SOA: semiconductor optical amplifier; FFP-TF: fiber Fabry–Pérot tunable filter; DAQ: data acquisition board; PC: personal computer; FBG: fiber Bragg grating).
