Mach-Zehnder Modulator Phase Control via Voltage Shifting
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Solution Overview
Problem
Existing optical transmitters with Mach-Zehnder modulators face challenges in controlling the phase of light without increasing voltage, which can lead to higher power consumption, optical loss, and increased size due to the need for wider voltage adjustments.
Innovation Solution
The optical transmitter incorporates a phase controller that shifts the voltage by an amount corresponding to a 2π change in phase when it deviates from a predetermined range, maintaining the voltage within the range and thus suppressing increases in voltage, using a Mach-Zehnder modulator with arm waveguides and phase adjustment electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the voltage adjustment range is widened to control phase variations, then the phase control range is improved, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes by detecting the actual voltage applied to the Mach-Zehnder modulator and comparing it with a target voltage, then adjusting the voltage by a specific amount corresponding to a 2π phase change when deviation exceeds a threshold. This dynamic parameter adjustment maintains phase control within the desired range without requiring continuous high voltage, thereby resolving the contradiction between expanded phase control range and reduced power consumption.
2Adaptability or versatility
If the voltage adjustment range is widened to control phase variations, then the phase control range is improved, but the optical loss increases
Solution Approach 1:
The patent implements parameter changes by monitoring the actual voltage and applying corrective adjustments only when the deviation from target voltage exceeds a predetermined threshold. This selective adjustment approach maintains the optical signal within optimal transmission parameters, preventing excessive voltage-induced optical loss while preserving the necessary phase control range.
3Adaptability or versatility
If the voltage adjustment range is widened to control phase variations, then the phase control range is improved, but the device size increases
Solution Approach 1:
The patent employs parameter changes through a control mechanism that detects actual voltage, compares it with target voltage, and applies precise corrections corresponding to 2π phase changes when needed. This software-controlled parameter adjustment eliminates the need for hardware expansions that would increase device size, maintaining full phase control range within the existing Mach-Zehnder modulator structure.
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 effectively controls the phase of light while reducing power consumption and optical loss, and minimizing the size and cost of the optical transmitter by keeping the voltage within a predetermined range, thereby preventing excessive voltage increases.
Implementation Method 1
a phase controller to control a phase of the light by applying a voltage to the Mach-Zehnder modulator
Data Source
AI summary
An optical transmitter includes a Mach-Zehnder modulator having an arm waveguide and a phase controller configured to control a phase of a light propagating through the arm waveguide by applying a voltage to the Mach-Zehnder modulator. When the voltage is deviated from a predetermined range, the phase controller shifts the voltage in the direction opposite to a direction of the deviation from the predetermined range by the amount corresponding to a change of 2π in the phase.