Fig. 4
From: Pure-high-even-order dispersion bound solitons complexes in ultra-fast fiber lasers

Measured spectra of PHEOD bound soliton pairs with fixed pump power, fine-tuning PC, and taking intra-cavity net β8 as (a) –2.66 ps8 (green), –3.99 ps8 (light orange), (b) –5.332 ps8 (orange and blue). c, d Corresponding autocorrelation traces