US 11,868,021 B2
Method for manufacturing optical modulator, testing method, non-transitory storage medium, and light transmission apparatus
Tsutomu Ishikawa, Osaka (JP); and Naoya Kono, Osaka (JP)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (JP)
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP)
Filed on Jan. 7, 2022, as Appl. No. 17/570,455.
Claims priority of application No. 2021-012461 (JP), filed on Jan. 28, 2021.
Prior Publication US 2022/0244613 A1, Aug. 4, 2022
Int. Cl. G02F 1/21 (2006.01); G01M 11/00 (2006.01); G02F 1/225 (2006.01)
CPC G02F 1/212 (2021.01) [G01M 11/30 (2013.01); G02F 1/2257 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for manufacturing an optical modulator,
the optical modulator including a Mach-Zehnder modulator,
the Mach-Zehnder modulator including an electrode and an arm waveguide,
the electrode being disposed on the arm waveguide,
the method comprising:
a step of preparing the Mach-Zehnder modulator;
a step of calculating a light transmittance in the arm waveguide based on a change amount of absorption loss of light propagating through the arm waveguide, an initial phase shift, and a phase change amount of the light propagating through the arm waveguide;
a step of acquiring, based on the light transmittance in the arm waveguide, a relationship between a voltage applied to the electrode and the phase change amount of the light propagating through the arm waveguide;
a step of acquiring, based on the relationship, a voltage in which the phase change amount of the light propagating through the arm waveguide has a predetermined amount when the light is modulated; and
a step of storing the voltage acquired in the step of acquiring in a storage unit.