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|1. (WO2018139652) METHOD FOR MANUFACTURING GI OPTICAL WAVEGUIDE|
NISSAN CHEMICAL CORPORATION
|Title:||METHOD FOR MANUFACTURING GI OPTICAL WAVEGUIDE|
[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.