Fig. 1. Fabry-Perot interferometer is used to monitor the change of laser frequency^[10]

Fig. 2. Optical frequency is monitored by femtosecond optical frequencycomb^[17]

Fig. 3. Auxiliary interferometer is constructed by long optical fiber to eliminate the sweep nonlinearity^[27]

Fig. 4. Experimental setup for broadband optical frequency chirp linearization using the self-heterodyne technique^[30]

Fig. 5. Traditional optical path calibration method for auxiliary interferometer

Fig. 6. Gas absorption chamber is used to calibrate the optical path difference of auxiliary interferometer^[20]

Fig. 7. Optical path active locking system of auxiliary interferometer

Fig. 8. Flow chart of spectral OCT dispersion compensation procedure^[40]

Fig. 9. Two laser diodes are simultaneously tuned upward and downward in frequency to eliminate dynamicerror^[46]

Fig. 10. Dynamic error elimination method based on dual acousto-optic modulator^[51]

Fig. 11. Dynamic error elimination method based on common path heterodyne interference^[53]