Hybrid Optical Source Using External Reflector for SOI Integration
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Solution Overview
Problem
Integrating III-V semiconductor structures with SOI-based photonic circuitry to create a practical and efficient hybrid optical source that effectively communicates light beams between chips is challenging due to manufacturing complexities and technical immaturity in III-V/SOI hybrid lasers.
Innovation Solution
A hybrid optical source design comprising an optical gain chip, an optical reflector chip, and a semiconductor-on-insulator (SOI) chip, where the optical reflector is aligned with a planarized surface to redirect and convey optical signals using an external micro-mirror for low-loss optical coupling, allowing for III-V semiconductor integration with SOI photonic circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If III-V semiconductor structures are integrated with SOI-based photonic circuitry to create a hybrid optical source, then the light emission capability is improved, but the manufacturing complexity and technical maturity increase significantly
Solution Approach 1:
The system is divided into separate functional modules: an optical gain chip containing the III-V semiconductor light source, an optical reflector chip with external micro-mirors, and an SOI chip with photonic circuitry. This segmentation allows each component to be optimized and manufactured independently using mature processes, avoiding the complexity of integrating III-V with SOI in a single monolithic structure.
Solution Approach 2:
An optical reflector chip with external micro-mirors is introduced as an intermediary component between the optical gain chip and the SOI chip. This mediator enables optical coupling without requiring direct integration of III-V and SOI materials, thus maintaining manufacturing simplicity while achieving effective light transmission between chips.
2Loss of energy
If external micro-mirors are used for optical coupling between chips, then the optical coupling efficiency is improved, but the alignment precision requirements increase
Solution Approach 1:
The optical coupling is achieved by redirecting light in a different spatial dimension using external micro-mirors. Instead of requiring precise lateral alignment between chips, the micro-mirors reflect light at specific angles, coupling optical signals between chips through vertical or angular dimension, thereby reducing lateral alignment precision requirements.
Solution Approach 2:
The external micro-mirors are pre-positioned and fixed on the optical reflector chip before final assembly. This preliminary positioning allows for pre-adjustment of reflection angles and facilitates easier alignment during assembly, reducing the actual alignment precision requirements during the final chip integration process.
3Ease of manufacture
If a planarized surface is used for the semiconductor layer, then the ease of assembly is improved, but the optical coupling precision may be compromised
Solution Approach 1:
The semiconductor layer features a planarized surface in the region where optical coupling occurs, providing a flat reference plane for assembling external components. Other regions of the semiconductor layer can maintain their original non-planar structures needed for photonic circuit functionality. This localized planarization achieves ease of assembly at the coupling interface without compromising the optical precision needed for circuit operation.
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 configuration enables efficient optical coupling with reduced divergence and loss, allowing for the creation of a scalable, energy-efficient light source suitable for high-speed operation with tunable wavelength and low back-reflection noise, overcoming previous integration challenges.
Implementation Method 1
an optical gain chip containing an optical gain material that provides an optical signal
Implementation Method 2
an optical reflector that reflects an optical signal generated by the optical gain chip
Implementation Method 3
an optical coupler to redirect the optical signal to and from the planarized surface of the semiconductor layer
Implementation Method 4
an optical waveguide to convey the optical signal from the optical coupler
Data Source
AI summary
A hybrid optical source comprises an optical gain chip containing an optical gain material that provides an optical signal, and an optical reflector chip including an optical reflector. It also includes a semiconductor-on-insulator (SOI) chip, which comprises a semiconductor layer having a planarized surface facing the semiconductor reflector. The semiconductor layer includes: an optical coupler to redirect the optical signal to and from the planarized surface; and an optical waveguide to convey the optical signal from the optical coupler. While assembling these chips, a height of the optical gain material is referenced against the planarized surface of the semiconductor layer, a height of the optical reflector is referenced against the planarized surface of the semiconductor layer, and the optical reflector is aligned with the optical coupler, so that the optical signal emanating from the optical gain material is reflected by the optical reflector and into the optical coupler.