IWDM Pump-Fiber Expanded Tip for Stable Single-Mode Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of larger core fibers in pump-fibers to reduce light intensity leads to multimode propagation, causing power instability and core damage in optical amplifiers, which is exacerbated by the smaller size of device modules requiring higher erbium concentrations and single pump usage.
Innovation Solution
Implementing an isolator wavelength division multiplexer (IWDM) with a pump-fiber having an expanded tip at the fiber end-face optically coupled to a WDM-Isolator core, maintaining single mode propagation while reducing power density and fiber damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a larger core is used in the pump-fiber to reduce light intensity, then core damage is reduced, but the fiber shifts from single mode to multimode propagation causing power instability
Solution Approach 1:
The pump-fiber is designed with different core diameters at different locations: a smaller core diameter (first diameter) along most of its length to maintain single mode propagation and power stability, and a larger core diameter (second diameter) specifically at the fiber end-face to reduce light intensity and prevent core damage. This local differentiation resolves the contradiction by applying different structural properties where needed.
Solution Approach 2:
The pump-fiber core is segmented into two distinct regions: a first core portion with a smaller diameter for the majority of the fiber length, and a second core portion with a larger diameter at the end-face. This segmentation allows each region to fulfill its specific function - maintaining single mode propagation in the first portion and reducing power density in the second portion.
2Stability of the object's composition
If a smaller core is used in the pump-fiber to maintain single mode propagation, then power stability is maintained, but light intensity increases causing core damage
Solution Approach 1:
The pump-fiber is designed with different core diameters at different locations: a smaller core diameter (first diameter) along most of its length to maintain single mode propagation and power stability, and a larger core diameter (second diameter) specifically at the fiber end-face to reduce light intensity and prevent core damage. This local differentiation resolves the contradiction by applying different structural properties where needed.
Solution Approach 2:
The pump-fiber core is segmented into two distinct regions: a first core portion with a smaller diameter for the majority of the fiber length, and a second core portion with a larger diameter at the end-face. This segmentation allows each region to fulfill its specific function - maintaining single mode propagation in the first portion and reducing power density in the second portion.
3Volume of moving object
If device modules are made smaller in size, then integration is improved, but pump power density increases requiring higher erbium concentrations and single pump usage
Solution Approach 1:
The pump-fiber is designed with different core diameters at different locations: a smaller core diameter (first diameter) along most of its length to maintain single mode propagation and power stability, and a larger core diameter (second diameter) specifically at the fiber end-face to reduce light intensity and prevent core damage. This local differentiation resolves the contradiction by applying different structural properties where needed.
Solution Approach 2:
The pump-fiber core is segmented into two distinct regions: a first core portion with a smaller diameter for the majority of the fiber length, and a second core portion with a larger diameter at the end-face. This segmentation allows each region to fulfill its specific function - maintaining single mode propagation in the first portion and reducing power density in the second portion.
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
Stabilizes signal power output by reducing core damage and power fluctuations, ensuring stable amplification in optical amplifiers despite increased power density and smaller module sizes.
Implementation Method 1
The WDM-Isolator core is configured to transmit the light at the first wavelength to the common-fiber and to reflect the light at the second wavelength into the common-fiber
Implementation Method 2
the WDM-Isolator core is configured to transmit the light at the first wavelength to the common-fiber and to reflect the light at the second wavelength into the common-fiber
Implementation Method 3
a pump-fiber defining an expanded tip optically coupled to a second side of the WDM-Isolator core, the pump-fiber configured to propagate pump light
Data Source
AI summary
Disclosed is an apparatus, including an isolator wavelength division multiplexer (IWDM). A signal-fiber is optically coupled to a first side of the WDM-Isolator core. The signal-fiber is configured to propagate signal light. A pump-fiber defines an expanded tip optically coupled to the WDM-Isolator core. The pump-fiber is configured to propagate pump light. A common-fiber is optically coupled to the WDM-Isolator core. The common-fiber is configured to propagate a combination of the signal light and the pump light. The WDM-Isolator core is configured to transmit the signal light to the common-fiber and to reflect the pump light into the common-fiber.