Optical Chip Power Detection Using Waveguide Photothermal Material
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Solution Overview
Problem
The integration of conventional optical power detectors on optical chips is complex and often difficult, especially on lithium niobate thin films, due to the inability to heterogeneously integrate semiconductor detector materials with lithium niobate.
Innovation Solution
An optical chip design that includes an optical device and an optical power detector with a waveguide and detection material. The detection material, which can be a metal, absorbs light and generates a preset effect, such as a photothermal effect, changing a parameter value like resistance, allowing for effective optical power monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor structures (PIN junction, PN junction) are used for optical power detectors, then detection function is achieved, but integration complexity increases and integration becomes difficult
Solution Approach 1:
The patent changes the detection mechanism from semiconductor junction-based detection to metal-based photothermal detection. By changing the material parameter (from semiconductor to metal) and the detection principle parameter (from electrical junction detection to thermal effect detection), the integration complexity is reduced while maintaining reliable detection function on lithium niobate chips
Solution Approach 2:
The patent replaces the electrical/mechanical semiconductor junction structure with a thermal field-based detection system. The metal detection material converts optical energy to thermal energy, and the temperature change is detected through resistance change, substituting the complex semiconductor electrical junction with a simpler thermal detection mechanism that is easier to integrate
2Reliability
If semiconductor detector materials are used on lithium niobate thin films, then optical power detection is achieved, but heterogeneous integration becomes impossible
Solution Approach 1:
The patent changes the material parameter from semiconductor (incompatible with lithium niobate) to metal (compatible with lithium niobate). Metals can be directly deposited on lithium niobate thin films using standard deposition techniques, achieving both optical power detection function and integration compatibility
Solution Approach 2:
The patent uses metal materials that can be deposited using standard thin-film deposition techniques commonly used in lithium niobate device fabrication. This copying of existing manufacturing processes enables seamless integration without requiring new heterogeneous integration techniques
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 design enables easy and effective integration of optical power detectors on optical chips, reducing complexity and production costs, and allowing for accurate monitoring of optical power without the need for complex structures.
Implementation Method 1
a detection material formed inside the waveguide and/or on a surface of the waveguide, the detection material absorbing light transmitted by the waveguide and generating a preset effect
Implementation Method 2
the preset effect includes a photothermal effect, and the preset parameter value includes resistance
Data Source
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AI summary
An optical chip and an optical module. The optical chip includes: an optical device (100); an optical power detector (200), connected to the optical device (100); a waveguide (210), used for transmitting light emitted from the optical device (100); and a detection material (220), formed inside the waveguide (210) and/or on a surface of the waveguide (210). The detection material (220) absorbs light transmitted by the waveguide (210) and generates a preset effect, and the preset effect changes a preset parameter value of the detection material (220). The optical chip can simply and effectively integrate the optical power detector.