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1. (WO2018139652) METHOD FOR MANUFACTURING GI OPTICAL WAVEGUIDE

Pub. No.:    WO/2018/139652    International Application No.:    PCT/JP2018/002778
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Tue Jan 30 00:59:59 CET 2018
IPC: G02B 6/13
G02B 6/122
Applicants: KEIO UNIVERSITY
学校法人慶應義塾
NISSAN CHEMICAL CORPORATION
日産化学株式会社
Inventors: ISHIGURE, Takaaki
石榑 崇明
SAITO, Yuki
齊藤 侑季
MARUSHIMA, Chinami
丸島 千波
NAGASAWA, Takehiro
長澤 偉大
Title: METHOD FOR MANUFACTURING GI OPTICAL WAVEGUIDE
Abstract:
[Problem] To provide a GI optical waveguide comprising a core having a substantially circular cross-sectional shape. [Solution] A method for manufacturing an optical waveguide, including: a first step for inserting a needle-shaped part on a distal end of a discharging part into an uncured cladding part; a second step for moving the needle-shaped part within the uncured cladding part while discharging uncured material from the needle-shaped part to form an uncured core part enveloped by the uncured cladding part; a third step for withdrawing the needle-shaped part from the uncured cladding part; and a fourth step for curing the uncured cladding part and the uncured core part; wherein said method is characterized in that the ratio of the viscosity of the material forming the uncured core part to the viscosity of the uncured cladding part at the temperature of the second step is 1.20 to 6.