Fig. 1. Experimental setup. (a) Schematic of EDFRL; (b) conventional fiber interferometer; (c) space-light matched interferometer; (d) long-arm reflection end of matched interferometer

Fig. 2. Power spectrum of beat signal among multiple longitudinal modes

Fig. 3. Interference signals of SLMI and conventional fiber interferometer under multiple-longitudinal-mode oscillation. (a)-(c) Longitudinal mode structure; (d)-(f) interference fringes of SLMI; (g)-(i) interference fringe of conventional fiber interferometer

Fig. 4. Longitudinal mode structure and interference fringe visibility during mode hopping. (a) Longitudinal mode structure; (b) interference fringe visibility of conventional fiber interferometer and AFMI

Fig. 5. Phase background noise of EDFRL via unbalanced fiber interferometer