Patent ID: 11868021
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The method for manufacturing an optical modulator according to claim 5, further comprising:
a step of measuring a first transmittance which is a light transmittance in the arm waveguide; and
a step of calculating a second transmittance which is a light transmittance in the arm waveguide, wherein
in the step of calculating the second transmittance,
a second transmittance in the first arm waveguide is represented by a function of the phase change amount of the light propagating through the first arm waveguide, the phase change amount of the light propagating through the first arm waveguide is represented by a function of the voltage applied to the third electrode, and thus the second transmittance in the first arm waveguide is calculated, and
a second transmittance in the second arm waveguide is represented by a function of the phase change amount of the light propagating through the second arm waveguide, the phase change amount of the light propagating through the second arm waveguide is represented by a function of the voltage applied to the fourth electrode, and thus the second transmittance in the second arm waveguide is calculated, and

the step of acquiring the relationship between the voltage and the phase change amount includes
a step of acquiring a relationship between the voltage applied to the third electrode and the phase change amount of the light propagating through the first arm waveguide by adjusting the second transmittance in the first arm waveguide such that the second transmittance in the first arm waveguide approaches a first transmittance in the first arm waveguide, and
a step of acquiring a relationship between the voltage applied to the fourth electrode and the phase change amount of the light propagating through the second arm waveguide by adjusting the second transmittance in the second arm waveguide such that the second transmittance in the second arm waveguide approaches a first transmittance in the second arm waveguide.