３層クラッド光ファイバ及び３層クラッド光ファイバ利用デバイス

Japanese Patent JP5762444

B2

According to some embodiments the triple-clad optical fiber comprises a core, a first inner cladding, a second inner cladding, and an outer cladding wherein: (i) the core comprises a radius r0 a first index of refraction n0; (ii) the first inner cladding surrounds the core and has a numerical aperture of at least about 0.12, and a second index of refraction n1 such that n1n1, wherein a relative refractive index percent (Delta%) of the second cladding relative to the outer cladding is greater 1%; and (iv) the outer cladding surrounds the second inner cladding and has a third index of refraction n3 such that n3