Fig. 3
From: Optical vector analysis with attometer resolution, 90-dB dynamic range and THz bandwidth

The optical spectra of the OFC and the selected comb line. a The generated 43-tone OFC signal measured in a span of more than 8 nm. b The comb line in the middle of the OFC selected by OBPF2 which has an SMSR of 46.23 dB. c The comb line with an SMSR of 21.52 dB in the marginal area of the OFC selected by OBPF2