Study on phase measurement uncertainty according to the number of phase shifting steps in a multiwavelength interferometer directly using optical comb modes

In a multi-wavelength interferometer using an electro-optic comb with a wide frequency mode spacing, the phase of each frequency mode, or wavelength, can be determined through phase shifting with the reference mirror scanning at constant intervals. Since each frequency mode has a different wavelength, the phase change for the same controlled mirror displacement varies. Therefore, a model-based analysis of phase shifting data was employed for phase determination at each wavelength. In this study, we aim to estimate the phase determination uncertainty according to the number of phase shifts through numerical simulations in the model-based analysis approach.