Semiconductor Optical Waveguide Structure for Heat and High-Frequency Balance
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Solution Overview
Problem
Conventional semiconductor optical integrated elements face a trade-off between high-frequency property and heat dissipation, with buried structures improving heat dissipation but compromising high-frequency performance, and high-mesa-ridge structures enhancing high-frequency performance but reducing heat dissipation, leading to potential element deterioration and breakage due to excessive heat generation.
Innovation Solution
A semiconductor optical integrated element design featuring a combination of buried and high-mesa-ridge structures for the optical waveguide, with a separation region between the laser diode and modulator portions, where the modulator portion has a buried structure on one side and a high-mesa-ridge structure on the other, optimizing both heat dissipation and high-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the EA modulator portion is formed as a buried structure, then heat dissipation is improved, but high-frequency property is inferior
Solution Approach 1:
The EA modulator portion is divided into multiple sections along the optical axis, with different waveguide structures assigned to different sections. Specifically, the input side features a buried structure for heat dissipation, while the output side features a high-mesa-ridge structure for high-frequency performance, resolving the contradiction between heat dissipation and high-frequency property.
Solution Approach 2:
Different regions of the EA modulator portion are given different structural qualities tailored to their specific functions. The input side region is designed with a buried structure optimized for heat dissipation, while the output side region is designed with a high-mesa-ridge structure optimized for high-frequency operation, allowing each region to have the optimal structure for its local requirements.
2Speed
If the EA modulator portion is formed as a high-mesa-ridge structure, then high-frequency property is improved, but heat dissipation is reduced
Solution Approach 1:
The EA modulator portion is segmented along the optical axis with different waveguide structures. The output side section uses a high-mesa-ridge structure to achieve high-frequency property, while the input side section uses a buried structure for heat dissipation, thus resolving the contradiction between high-frequency performance and heat dissipation.
Solution Approach 2:
The output side region of the EA modulator is given a high-mesa-ridge structure with specific local qualities optimized for high-frequency operation, while the input side region is given a buried structure optimized for heat dissipation. This local differentiation allows each region to perform its specific function optimally without compromising the other.
3Power
If beam input power to the EA modulator portion is increased, then modulation capability is improved, but heat generation increases causing element deterioration or breakage
Solution Approach 1:
The EA modulator portion is segmented into input side and output side sections with different structures. The input side buried structure provides efficient heat dissipation to handle high beam input power, while the output side high-mesa-ridge structure maintains high-frequency performance, together enabling high modulation capability without element deterioration.
Solution Approach 2:
The input side region is designed with a buried structure having local qualities optimized for heat dissipation to handle high power input, while the output side region is designed with a high-mesa-ridge structure optimized for high-frequency modulation. This local optimization allows the element to withstand high beam input power while maintaining reliability.
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 design achieves both high-frequency property and necessary heat dissipation, preventing property deterioration and element breakage by efficiently dissipating heat while reducing capacitive components.
Implementation Method 1
an electro-absorption semiconductor optical modulator (EAM, hereafter referred to as EA modulator) suitable for high-speed modulation
Data Source
AI summary
A semiconductor optical integrated element of the present disclosure includes: a laser diode portion which is provided on one end side above a substrate, has a first optical waveguide, and emits a laser beam; a modulator portion which is provided on another end side, has a second optical waveguide, and modulates the laser beam; a separation region provided between the laser diode portion and the modulator portion; and a pair of grooves provided on both sides along the first optical waveguide and the second optical waveguide. The second optical waveguide in the separation region and the second optical waveguide in a part on the separation region side in the modulator portion have a buried structure, and the second optical waveguide in a remaining part in the modulator portion has a high-mesa-ridge structure.