SOA Optical Module Assembly Using Segmented Coupling Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The assembly of optical modules with semiconductor optical amplifiers (SOA) faces challenges due to the interference of optical isolators, which can cause misalignment and failure in coupling with other optical components, especially when active alignment is hindered by light cutting from the SOA.
Innovation Solution
The process involves activating the SOA to generate spontaneous emission, aligning coupling units based on maximum emission detection, and using test beams to optimize alignment, with YAG laser welding for secure fixation, while incorporating optical isolators to manage light direction effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical isolator is installed to prevent light from returning back to the SOA, then optical noise is prevented, but active alignment of other optical devices becomes impossible because the optical isolator cuts light coming from the SOA
Solution Approach 1:
The optical path is segmented into two separate coupling units: one for input light (with optical isolator) and one for output light (without optical isolator). This allows the optical isolator to protect against back-reflection while the other coupling unit enables active alignment through light emission from the SOA.
Solution Approach 2:
A beam splitter or dichroic mirror is introduced as an intermediary component to separate the light paths. This allows the optical isolator to function for protecting the SOA while still permitting alignment light to pass through to the other optical devices for active alignment purposes.
2Reliability
If two facets arrangements are used to couple optical components with the SOA, then optical functionality is achieved, but misalignment between components occurs easily and assembly failures increase
Solution Approach 1:
Multiple coupling functions are merged into a single integrated coupling unit that handles both input and output light paths. This reduces the number of separate alignment interfaces from two to one, thereby minimizing misalignment errors and assembly failures while maintaining full optical functionality.
Solution Approach 2:
The coupling unit is designed with multi-functionality to handle both signal transmission and alignment functions simultaneously. This universal design allows a single coupling interface to serve multiple purposes, reducing the complexity and potential for misalignment that would arise from separate dedicated interfaces.
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 approach ensures precise and reliable alignment of optical components, preventing optical noise and enhancing the performance of optical modules by stabilizing light transmission and reducing misalignment issues.
Implementation Method 1
The coupling unit is welded to the lens holder but the lens holder is soldered to the housing
Implementation Method 2
The lens holder is soldered to the housing
Data Source
AI summary
An optical module providing a semiconductor optical amplifier (SOA), and a process to assembly the optical module are disclosed. The optical module provides front and rear coupling units each optically coupled with the SOA and fixed to the housing enclosing the SOA. The housing has a slim wall fixing a lens holder soldered to the slim wall. The front and/or rear coupling unit is fixed to the lens holder by YAG laser welding after the active alignment by using a spontaneous emission of the SOA, and amplified emission of externally provided test beam.