Figure 3
From: Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement
Optical spectra of the interference signals. (a) The optical spectrum of the comb; (b) indicates the wavelength of the CW laser; (c) the optical spectrum after filter1, there is a small bump at 1550 nm which indicates the spectrum of the CW laser is not suppressed perfectly; (d) the optical spectrum after filter2.
