Fig. 5: Spectral coherence of solitons output from different ports.
From: Multi-port real-time observation for ultrafast intracavitary evolution dynamics
a–c The one-dimensional interference fringe results of the EDF port, PC port, and OIM port. The one-dimensional spectral coherence increases sequentially. EDF: erbium-doped fiber; PC: polarization controller; OIM: optical integrated module. d–f The two-dimensional interference fringe results. The zoom-in image around the central wavelength shows well-defined square-grid pattern with high contrast, indicating their coherence are quite well. g–i The estimated cross-spectral densities calculated from (d–f). The closer the color is to red, the closer the CSD is to 1, which means better spectral coherence. The two-dimensional spectral coherence also increases sequentially.
