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12 December 2018 Dithering phase locked technique analysis in photonic lantern
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Proceedings Volume 10844, Advanced Laser Technology and Applications; 1084414 (2018)
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
We have made simulations for a 3*1 photonic lantern and the latter experiments were carried out to test characters of the lantern we designed. The three core lantern with 0.004 rad taper angle has a 15 mm taper length which begins with a 125 μm outer diameter and ends with a 10.4 μm outer diameter(core diameter to outer diameter ratio is 2/25), while the NA of single mode fiber is 0.08 and for 25/400 μm core/cladding diameter few mode fiber it is 0.1. In order to obtain preferable LP01 mode shape, we used a phase control system to lock the phase of each channel staying consistent. The consequence demonstrated that the whole phase distribution of single mode fibers was controlled to an extent. Compared to amplitude, photonic lantern is more sensitive to phase fluctuation. We made simulations using Rsoft to test different variables of light propagating in 3*1 photonic lantern, and the results were in agreement with the conclusion. Thus, coherent beam combination based on dithering phase locked technique was studied systematically and we applied it to 3*1 photonic lantern. As a result, the beam received by light spot analyzer showed a stable mode shape but still existing some differences compared to expected LP01 mode or LP11 mode, which put forward reflection about the basic theory inside photonic lanterns (the beam propagating through tapered region didn’t make sense if using coherent beam combination calculation). At last, we attempted to explore the beam propagation through the lantern and to give any better evaluation function in phase control algorithm so as to improve the phase locked process.
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Haolong Wu, Zongfu Jiang, Wenguang Liu, Baolai Yang, Yanxing Ma, Kun Xie, and Yao Lu "Dithering phase locked technique analysis in photonic lantern", Proc. SPIE 10844, Advanced Laser Technology and Applications, 1084414 (12 December 2018);


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