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Scheme of the APPLE DOCT setup: TLS – tunable light source, FC – fiber coupler, PC – polarization controller, C – collimator, DC – dispersion compensation, VDF – variable density filter, MC – miniature fiber collimator, FPT – facet prism telescope, M – mirror, MEMS – 2D scanning mirror, T – telescope, L – lens, FBG – fiber Bragg grating, BD – balanced amplified photodetector unit, DAQ – data acquisition board.
