title: Selective mode excitation and discrimination of four-core homogeneous coupled multi-core fiber.
abstract: 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.
authors.affiliation: Graduate School of Eng., Yokohama National University, 79-5 Tokiwadai, Yokohama, 240-8501, Japan. ykokubun@ynu.ac.jp
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Kokubun
authors.forename: Toshinori
authors.initials: T
authors.lastname: Komo
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Takenaga
authors.forename: Shoji
authors.initials: S
authors.lastname: Tanigawa
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Matsuo