Microring Resonator Heater Layout for High-Current Reliability
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Solution Overview
Problem
Microring resonator device heaters in optical data communication systems face reliability issues under high temperature and high electrical current conditions, limiting the resonant wavelength tuning range and operational temperature range of wavelength-division multiplexed systems.
Innovation Solution
The implementation of doped-silicon non-silicided resistive radial-current heaters within the microring resonator device, with concentric rings of silicided silicon and controlled electrical contacts, allows for localized heating and efficient heat dissipation, enhancing reliability and resonant wavelength tuning range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heaters are used in microring resonator devices, then heating function is provided, but reliability deteriorates under high temperature and high electrical current conditions
Solution Approach 1:
The heater structure is segmented into multiple functional regions: a doped silicon region for heat generation, inner and outer silicided silicon contact regions for electrical connection, and strategically placed heat sink regions. This segmentation allows each region to perform its specific function optimally while working together to improve overall reliability under high temperature conditions.
Solution Approach 2:
Different regions of the heater structure are assigned different material properties and functions: the doped silicon region has high electrical resistance for efficient heat generation, the silicided silicon contact regions have low resistance for reliable electrical connection, and the heat sink regions are positioned to manage thermal distribution. This local differentiation of properties enhances both reliability and operational temperature range.
2Adaptability or versatility
If conventional heaters are used in microring resonator devices, then heating function is provided, but resonant wavelength tuning range is limited
Solution Approach 1:
The heater structure enables dynamic control of the microring resonator's resonant wavelength through efficient thermal management. The segmented design with optimized heat generation and dissipation regions allows for precise and reliable wavelength tuning across an extended range, making the system adaptable to different operational requirements.
Solution Approach 2:
The heater structure facilitates changes in the resonant wavelength parameter by controlling temperature distribution within the microring resonator. The doped silicon region generates heat that shifts the resonant wavelength, while the heat sink regions manage the thermal profile to extend the tuning range and maintain reliability during parameter changes.
3Power
If high electrical current is applied to heaters, then heating efficiency is improved, but reliability deteriorates
Solution Approach 1:
The heater structure uses local quality differentiation to manage high electrical current: the doped silicon region is designed with appropriate doping levels to handle high current densities while generating heat efficiently, whereas the silicided silicon contact regions are optimized for low resistance electrical connection to minimize power loss and heating at the contacts themselves.
Solution Approach 2:
The silicided silicon contact regions act as intermediaries between the electrical contacts and the doped silicon heating region. These intermediary regions provide reliable electrical connection while managing the transition of high electrical current into the heating element, preventing direct stress on the contacts and improving overall system reliability under high power conditions.
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 provides improved resilience to high temperatures and currents, increasing the resonant wavelength tuning range and operational temperature range of the WDM system, ensuring reliable operation.
Implementation Method 1
A voltage differential between the first plurality of electrical contacts and the second plurality of electrical contacts is used to control an electrical current flow through the doped ring of silicon to control a temperature of the ring-shaped optical waveguide
Implementation Method 2
an inner contact region formed of silicided silicon along an inner side of the doped-silicon non-silicided region. The electro-optical semiconductor chip also includes an outer contact region formed of silicided silicon along an outer side of the doped-silicon non-silicided region
Implementation Method 3
a bus optical waveguide that extends past the ring-shaped optical waveguide and within an evanescent optical coupling distance of the ring-shaped optical waveguide, such that an optical coupling region exists between the bus optical waveguide and the ring-shaped optical waveguide
Implementation Method 4
control a temperature of the ring-shaped optical waveguide
Data Source
AI summary
An electro-optical semiconductor chip includes a ring-shaped optical waveguide and a bus optical waveguide extending past the ring-shaped optical waveguide, such that an optical coupling region exists therebetween. A doped-silicon non-silicided region is disposed outside of the ring-shaped optical waveguide and within thermal communication with the ring-shaped optical waveguide. An inner contact region is formed of silicided silicon along an inner side of the doped-silicon non-silicided region. An outer contact region is formed of silicided silicon along an outer side of the doped-silicon non-silicided region. A first plurality of electrical contacts electrically contact the inner contact region. A second plurality of electrical contacts electrically contact the outer contact region. A voltage differential between the first and second pluralities of electrical contacts controls an electrical current flow through the doped-silicon non-silicided region to control a temperature of at least a portion of the ring-shaped optical waveguide.