Lateral Heater Placement for Optical Modulator Temperature Control
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Solution Overview
Problem
Existing optical component heaters for optical modulators are associated with high optical loss due to large temperature gradients across the ridge waveguide, leading to mode movement and low fabrication tolerances.
Innovation Solution
A heater is positioned on the lateral side of the electro-absorption medium ridge waveguide instead of the top, providing more uniform heating and reducing mode movement, thereby minimizing optical loss and improving fabrication tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is positioned on the top of a ridge waveguide to control temperature, then temperature control is achieved, but optical loss increases due to large temperature gradients causing mode movement
Solution Approach 1:
The heater is repositioned from the top surface to the lateral side of the ridge waveguide, changing the spatial dimension of heating application. This lateral positioning creates a more uniform temperature distribution across the waveguide cross-section, reducing temperature gradients that cause mode movement and optical loss while maintaining effective temperature control
2Area of stationary object
If the ridge waveguide width is reduced to improve device integration, then device density increases, but fabrication tolerances decrease making manufacturing more difficult
Solution Approach 1:
The heating is localized to the lateral side of the ridge waveguide rather than applied uniformly across the top. This localized lateral heating approach allows the narrow ridge structure to be maintained for high device density while the heating configuration compensates for the reduced tolerance margin by creating a more stable thermal environment that reduces mode movement sensitivity
3Temperature
If a heater is positioned on the top of the ridge waveguide, then temperature control is achieved, but parasitic capacitance increases
Solution Approach 1:
The heater structure is moved from a top-surface configuration to a lateral-side configuration. This dimensional change in heater placement reduces the overlap between the heater electrodes and the optical mode, thereby reducing parasitic capacitance while maintaining the ability to control the waveguide temperature effectively
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
The solution results in reduced optical loss and increased manufacturing tolerances, allowing for easier fabrication and reduced parasitic capacitance, while maintaining efficient temperature control.
Implementation Method 1
A heater is positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge
Implementation Method 2
The waveguide is configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium
Data Source
AI summary
The optical device includes a waveguide positioned on a base and a modulator positioned on the base. The modulator includes a ridge of an electro-absorption medium having a top side and a lateral side. The lateral side is between the top side and the base and the top side has a width. The waveguide is configured to guide a light signal through the modulator such that the light signal is guided through the ridge of electro-absorption medium. A heater is positioned over the lateral side of the electro-absorption medium without being positioned over the entire width of the ridge.