Semiconductor Optical Amplifier Layout for Same-Facet Port Coupling
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Solution Overview
Problem
Existing semiconductor optical amplifiers (SOAs) face challenges in achieving precise optical coupling due to limited accuracy in dicing processes, leading to large tolerances in port distances and resulting in high attenuation and non-compact designs.
Innovation Solution
A compact SOA design with symmetrical active regions and a mirror configuration, where the input and output optical ports are located at the same facet, allowing for accurate alignment and reducing gain ripple, and utilizing III-V compound materials for low loss waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SOA input optical port and output optical port are positioned at opposite facets with close spacing for desired optical coupling, then optical coupling efficiency is improved, but manufacturing precision deteriorates due to limited dicing accuracy causing large tolerance in port distances
Solution Approach 1:
The patent moves both optical ports from opposite facets to the same facet of the SOA chip. This dimensional repositioning allows the ports to be laterally spaced apart while maintaining optical coupling through the substrate, thereby achieving desired optical coupling without requiring extremely close spacing that would be sensitive to dicing tolerance variations.
Solution Approach 2:
The patent introduces an optical waveguide as an intermediary structure that extends from the input optical port through the SOA active region to the output optical port. This waveguide mediates the optical signal transmission, enabling precise optical coupling while allowing the ports to be positioned at comfortable lateral distances that are less sensitive to dicing accuracy.
2Measurement precision
If a U-shaped passive waveguide is used to position ports at the same plane, then port alignment is improved, but device complexity increases and attenuation increases
Solution Approach 1:
The patent merges the positioning function and the optical signal transmission function into a single integrated structure. The optical waveguide simultaneously achieves port alignment at the same facet and serves as the transmission path for the optical signal, eliminating the need for separate positioning structures like U-shaped waveguides and reducing overall device complexity.
Solution Approach 2:
The optical waveguide in the patent serves multiple functions: it positions the optical ports at the same facet for accurate alignment, provides the transmission path for the optical signal through the SOA active region, and enables compact integration. This multi-functionality replaces the single-function U-shaped passive waveguide that only provided positioning.
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 new design achieves low loss and low attenuation, enabling precise optical coupling and compactness, while maintaining efficient signal amplification.
Implementation Method 1
utilizing III-V compound materials for low loss waveguides
Implementation Method 2
a mirror, a second active region, and a SOA output optical port located at a first facet of the SOA. The SOA input optical port, first active region, mirror, second active region, and the SOA output optical port are in optical communication with each other
Data Source
AI summary
A SOA that includes a SOA input optical port, a first region, a mirror, a second region and a SOA output optical port. At least one of the first region and the second region is an active region configured to amplify an optical signal. The SOA input optical port, the first region, the mirror, the second region, and the SOA output optical port are in optical communication with each other. The SOA input optical port and the SOA output optical port are located at a first facet of the SOA. The first region and the second region are oriented to each other, and are oriented to the first facet of the SOA.