Optical Device Substrate Gap and Binder for Thermal Tuning
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Solution Overview
Problem
Silicon-based optical devices face challenges with heat dissipation and mechanical support during thermal tuning, leading to high power consumption and mechanical stress during manufacturing, which complicates their use in WDM communication systems.
Innovation Solution
An optical device with a substrate gap under the thermal-tuning mechanism and a binder material to maintain mechanical strength, reducing thermal coupling and power consumption, and using a semiconductor substrate with a silicon-on-insulator technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the silicon substrate is removed to create a free-standing optical device to reduce thermal coupling and power consumption, then thermal tuning power consumption is reduced by 10-100×, but the mechanical strength and structural stability during manufacturing deteriorate
Solution Approach 1:
The substrate is segmented by removing a portion to create a gap, separating the thermal tuning region from the bulk substrate. This reduces thermal coupling while maintaining mechanical support through the remaining substrate portions, resolving the contradiction between power consumption reduction and mechanical strength preservation.
Solution Approach 2:
The substrate structure is modified locally by creating a gap only in the region where thermal tuning occurs, while other portions of the substrate remain intact to provide mechanical support. This localized modification reduces thermal coupling without compromising overall structural integrity during manufacturing.
2Use of energy by moving object
If direct heating is used to tune the operating wavelength, then energy efficiency is improved, but optical losses due to free-carrier absorption increase and the optical waveguide cannot perform additional functions
Solution Approach 1:
The heating function is extracted from the optical waveguide structure itself and separated into a distinct thermal tuning mechanism adjacent to the waveguide. This allows efficient thermal tuning without doping the waveguide, eliminating free-carrier absorption losses while maintaining energy efficiency.
Solution Approach 2:
A thermal conductor is introduced as an intermediary between the heat source and the optical waveguide. This mediator enables efficient heat transfer to the waveguide for wavelength tuning without requiring direct doping of the waveguide, thus avoiding free-carrier absorption while maintaining energy efficiency.
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 significantly reduces power consumption associated with thermal tuning by 10-100× and ensures mechanical support during processing, enhancing the yield and reliability of silicon-based optical devices for WDM systems.
Implementation Method 1
a thermal-tuning mechanism that modifies a temperature of the wavelength-sensitive optical component, thereby specifying an operating wavelength
Implementation Method 2
a portion of the substrate is removed to create a gap in the substrate... significantly reduces power consumption associated with thermal tuning
Data Source
AI summary
An optical device implemented on a substrate (such as silicon) is described. This optical device includes a wavelength-sensitive optical component with a high thermal resistance to a surrounding external environment and a low thermal resistance to a localized thermal-tuning mechanism (such as a heater), which modifies a temperature of the wavelength-sensitive optical component, thereby specifying an operating wavelength of the wavelength-sensitive optical component. In particular, the thermal resistance associated with a thermal dissipation path from the thermal-tuning mechanism to the external environment via the substrate is increased by removing a portion of the substrate to create a gap that is proximate to the thermal-tuning mechanism and the wavelength-sensitive optical component. Furthermore, the optical device includes a binder material mechanically coupled to the substrate and proximate to the gap, thereby maintaining a mechanical strength of the optical device.