Yuxue Lin, Hui Gao, Longsheng Wang, Tenglong Li, Tong Zhao, Pengfa Chang, Anbang Wang, Yuncai Wang. Time-Delay Signature Elimination of Chaos in Semiconductor Lasers with Multimode Fiber Feedback[J]. Chinese Journal of Lasers, 2024, 51(6): 0606002
- Chinese Journal of Lasers
- Vol. 51, Issue 6, 0606002 (2024)
Fig. 1. Experimental setup of generating chaos without time-delay signature using MMF feedback laser
Fig. 2. Comparison of typical characteristics of chaotic signals fed back by different fibers when Kf=0.1. (a) Time series; (b) autocorrelation; (c) spectrum; (d) local spectrum
Fig. 3. Influence of fiber core diameter on mode field spot and number of modes when fiber length is 1 km
Fig. 4. Effects of core offset of MMF with D=50 μm on mode field spot and number of modes when fiber length is 1 km
Fig. 5. Effects of core offset of MMF with D=62.5 μm on mode field spot and number of modes when fiber length is 1 km
Fig. 6. Effect of MMF length on mode divergence degree when Δd=0. (a)(b) L=0.1 m; (c)(d) L= 10 m; (e)(f) L=1 km
Fig. 7. Typical signal characteristics of chaotic lasers subject to SMF and MMF feedback when Kf=0.1. (a1)‒(a4) SMF; (b1)‒(b4) MMF with D=50 μm; (c1)‒(c4) MMF with D=62.5 μm
Fig. 8. Influence of relative offset of fiber core on TDS. (a) L=0.1 km; (b) L=1 km; (c) L=10 km; (d) L=15 km
Fig. 9. Influence of fiber feedback strength on TDS. (a) L=0.1 km; (b) L=1 km; (c) L=10 km; (d) L=15 km
Fig. 10. Influence of fiber length on TDS. (a) Kf=0.05; (b) Kf=0.10; (c) Kf=0.25; (d) Kf=0.39
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Table 1. Internal parameters of laser
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