Kokubun Yasuo, Komo Toshinori, Takenaga Katsuhiro, Tanigawa Shoji, Matsuo Shoichiro
Graduate School of Eng., Yokohama National University, 79-5 Tokiwadai, Yokohama, 240-8501, Japan.
Opt Express. 2011 Dec 12;19(26):B905-14. doi: 10.1364/OE.19.00B905.
Coupled modes of homogeneous coupled multi-core fiber are selectively excited and discriminated utilizing the difference of equivalent propagation angle. To quantatively evaluate the extinction ratio (selectivity) of adjacent modes, a new mode discrimination technique is developed by measuring the visibility of far-field patterns under small change of wavelength of the launching beam. The peak angles of discriminated far-field patterns show a strong correlation with the incident angle of the launching beam, which means that the coupled modes were selectively excited and discriminated.
利用等效传播角的差异，对均匀耦合多芯光纤的耦合模式进行选择性激发和区分。为了定量评估相邻模式的消光比（选择性），通过测量发射光束波长微小变化下远场图案的可见度，开发了一种新的模式区分技术。区分后的远场图案的峰值角度与发射光束的入射角呈现出很强的相关性，这意味着耦合模式被选择性地激发和区分。
