Fig. 1. Scheme of the ring cavity of the multiwavelength TDFL based on NPR.

Fig. 2. (a) Single-wavelength operation without PMF; (b) four-wavelength operation without PMF.

Fig. 3. (a) Dual-wavelength operation; (b) single-wavelength operation of the left; (c) single-wavelength operation of the right.

Fig. 4. (a) Model of the cavity; (b) the relationship between the transmission and the phase shift.