Mach-Zehnder Modulator Voltage Calibration for Phase Control
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Solution Overview
Problem
Existing methods for manufacturing optical modulators, particularly Mach-Zehnder modulators, face challenges in setting a predetermined range for the phase change amount of light without increasing light absorption loss, due to variations in phase adjusting efficiency across different modulators.
Innovation Solution
A method is developed that involves preparing Mach-Zehnder modulators with electrodes on arm waveguides, acquiring a relationship between applied voltage and phase change amount, determining a voltage that sets the phase change range to a predetermined magnitude, and storing this voltage for each modulator to optimize performance and minimize absorption loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed voltage is applied to all Mach-Zehnder modulators, then the manufacturing process is simple, but the phase change amount varies outside the predetermined range due to variations in phase adjusting efficiency
Solution Approach 1:
The patent changes the voltage parameter individually for each Mach-Zehnder modulator based on its specific phase adjusting efficiency characteristics. By measuring the actual phase change amount for each modulator and adjusting the applied voltage accordingly, the system ensures that all modulators operate within the predetermined phase change range while accounting for manufacturing variations.
Solution Approach 2:
The patent implements a feedback mechanism where the phase change amount of each Mach-Zehnder modulator is measured and used to determine the appropriate voltage to apply. This closed-loop approach allows the system to automatically compensate for variations in phase adjusting efficiency and maintain consistent performance across all modulators.
2Adaptability or versatility
If voltage is increased to expand phase change range, then the phase adjusting range increases, but light absorption loss increases
Solution Approach 1:
Instead of increasing voltage to expand the phase change range, the patent adjusts the voltage parameter individually for each modulator to achieve the required phase change amount within the predetermined range. This approach maintains adaptability across different modulators while avoiding the energy loss associated with higher voltages.
Solution Approach 2:
The patent applies only the necessary voltage to achieve the predetermined phase change range for each modulator, avoiding excessive voltage application. By determining the minimum required voltage based on actual measurements, the system achieves the needed adaptability without incurring unnecessary light absorption loss.
3Manufacturing precision
If individual voltage measurement and adjustment is performed for each modulator, then the phase change amount is precisely controlled within the predetermined range, but the manufacturing process becomes complex
Solution Approach 1:
The patent enables each Mach-Zehnder modulator to essentially self-adjust by measuring its own phase change characteristics and determining the appropriate voltage for operation. This self-service approach simplifies the overall system complexity compared to a centralized control system, as each modulator is independently characterized and configured.
Solution Approach 2:
The patent performs voltage measurement and adjustment as a preliminary step during the manufacturing or setup phase. By determining and storing the appropriate voltage for each modulator beforehand, the system achieves precise phase change control without requiring complex real-time adjustment mechanisms during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise setting of the phase change range in Mach-Zehnder modulators, effectively suppressing the increase in light absorption loss and ensuring consistent performance across multiple modulators.
Implementation Method 1
an electrode and an arm waveguide, the electrode being disposed on the arm waveguide... a relationship between a voltage applied to the electrode and a phase change amount of light propagating through the arm waveguide
Data Source
AI summary
A method for manufacturing an optical modulator is disclosed. The optical modulator includes a Mach-Zehnder modulator, the Mach-Zehnder modulator including an electrode and an arm waveguide, the electrode being provided on the arm waveguide. The method includes a step of preparing the Mach-Zehnder modulator, a step of acquiring a relationship between a voltage applied to the electrode and a phase change amount of light propagating through the arm waveguide based on a light transmittance in the arm waveguide, a step of acquiring a voltage in which a range of a phase change amount of light in the Mach-Zehnder modulator has a predetermined range based on the relationship, and a step of storing the voltage in a storage unit.