Method for manufacturing optical modulator, testing method, non-transitory storage medium, and light transmission apparatus

A method for testing an optical modulator, the optical modulator including a plurality of Mach-Zehnder modulators that each includes an electrode and an arm waveguide, and the electrode is disposed on the arm waveguide, the method comprising:

• a step of preparing the plurality of Mach-Zehnder modulators;
• measuring a first transmittance which is a light transmittance in the arm waveguide while adjusting an operating point;
• calculating a second transmittance which is a light transmittance in the arm waveguide;
• calculating an optimized voltage using the first transmittance and the second transmittance;
• a step of calculating for each of the plurality of Mach-Zehnder modulators, based on the optimized voltage, a relationship between a voltage applied to the electrode and a phase change amount of light propagating through the arm waveguide;
• a step of acquiring for each of the plurality of Mach-Zehnder modulators, based on the relationship, a second voltage in which a range of a phase change amount of light in each of the plurality of Mach-Zehnder modulators has a predetermined range;
• and
• store the second voltage in a storage unit.

A non-transitory computer-readable storage medium storing a program for testing an optical modulator, the optical modulator including a plurality of Mach-Zehnder modulators that each includes an electrode and an arm waveguide, and the electrode is disposed on the arm waveguide, the program when executed by a computer causes the computer to:

• prepare the plurality of Mach-Zehnder modulators;
• measure a first transmittance which is a light transmittance in the arm waveguide while adjusting an operating point;
• calculate a second transmittance which is a light transmittance in the arm waveguide;
• calculate an optimized voltage using the first transmittance and the second transmittance;
• calculate for each of the plurality of Mach-Zehnder modulators, based on the optimized voltage, a relationship between a voltage applied to the electrode and a phase change amount of light propagating through the arm waveguide;
• acquire for each of the plurality of Mach-Zehnder modulators, based on the relationship, a second voltage in which a range of a phase change amount of light in each of the plurality of Mach-Zehnder modulators has a predetermined range;
• and
• store the second voltage in a storage unit.

A light transmission apparatus comprising:

• a plurality of Mach-Zehnder modulators, each of the plurality of Mach-Zehnder modulators include an electrode and an arm waveguide, and each electrode is disposed on a respective arm waveguide;
• a storage unit;
• and
• a processor communicatively coupled to the plurality of Mach-Zehnder modulators and the storage unit, wherein the processor is configured to:
• measure, for each of the plurality of Mach-Zehnder modulators, a first transmittance which is a light transmittance in the arm waveguide while adjusting an operating point,
• calculate, for each of the plurality of Mach-Zehnder modulators, a second transmittance which is a light transmittance in the arm waveguide,
• calculate, for each of the plurality of Mach-Zehnder modulators, an optimized voltage using the first transmittance and the second transmittance,
• calculate, for each of the plurality of Mach-Zehnder modulators, based on the optimized voltage, a relationship between a voltage applied to the electrode and a phase change amount of light propagating through the arm waveguide,
• acquire, for each of the plurality of Mach-Zehnder modulators, based on the relationship, a second voltage in which a range of a phase change amount of light in each of the plurality Mach-Zehnder modulators has a predetermined range, and
• store, in the storage unit, for each of the plurality of Mach-Zehnder modulators, the second voltage.