Fig. 1. The first-order exact dark rogue wavesolution. The initial parameters are given by a₁=a₂=1, δ=$$\text{Unknown environment 'document'}$$ and κ=－1/2

Fig. 2. The transmission evolution of the initial input waveform shown in equation (4) in the fiber. The parameters are given by r=1, b=0 and T₁=5

Fig. 3. The transmission evolution of two adjacent in-phase first-order dark rogue waves with different intervals T₁

Fig. 4. The three dimensional stereogram of "twisted" dark rogue wave in the black frame of Fig. 3(a)

Fig. 5. The transmission evolution of two adjacent out of-phase first-order dark rogue waves with different intervals T₁, the other parameters are the same as in Fig. 2

Fig. 6. The interaction of two in-phase first-order dark rogue waves with different amplitude coefficients r

Fig. 7. The transmission evolution of the second-order dark rogue wave with composite structure in single-mode fiber

Fig. 8. The transmission evolution of the second-order dark rogue wave with triplet (or three-sister) structure in single-mode fiber