Multicore Fiber Spatial Joining Crosstalk Suppression
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Solution Overview
Problem
Multicore fibers (MCFs) in optical communication systems face challenges with crosstalk due to increased optical coupling between cores, leading to signal intensity bias and reduced communication quality.
Innovation Solution
The optical module incorporates a configuration with both uncoupled and coupled MCFs, where the coupled MCFs have a larger mode field diameter and are strategically positioned to suppress crosstalk along specific lengths, reducing optical connection losses and manufacturing tolerances, while the uncoupled MCFs maintain low core coupling for minimal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mode field diameter of the coupled MCF is increased to reduce optical connection losses and manufacturing tolerances, then the optical coupling between cores increases, but this causes increased crosstalk between cores
Solution Approach 1:
The patent applies local quality by creating a coupled MCF section with enlarged mode field diameter only at the spatial joining part where optical connection is needed, while the rest of the MCF maintains smaller core spacing to minimize crosstalk. This localized modification allows the system to benefit from increased tolerance at the connection point without suffering from excessive crosstalk throughout the entire fiber length.
Solution Approach 2:
The MCF is segmented into different sections: a first section with standard core spacing, a middle section (spatial joining part) with enlarged mode field diameter for connection, and a third section returning to standard spacing. This segmentation allows the patent to optimize different regions for different functions - connection tolerance in the middle section and crosstalk suppression in the end sections.
2Power
If the core spacing in MCF is reduced to increase optical coupling and improve signal strength, then the coupling efficiency improves, but this increases crosstalk between adjacent cores
Solution Approach 1:
The patent implements local quality by modifying the mode field diameter specifically at the spatial joining part where enhanced coupling is needed for connection, rather than uniformly reducing core spacing throughout the entire MCF. This localized approach achieves the necessary signal coupling at the connection point while maintaining adequate spacing elsewhere to prevent excessive crosstalk.
Solution Approach 2:
The MCF structure exhibits periodic characteristics with sections of standard spacing alternating with sections of modified spacing at the spatial joining part. This periodic structure allows the system to achieve enhanced coupling where needed while maintaining crosstalk suppression in other regions, creating a rhythm of coupling and isolation zones.
3Manufacturing precision
If a coupled MCF with large mode field diameter is used throughout the entire fiber length to minimize connection losses, then optical connection tolerance improves, but crosstalk between cores increases significantly over the transmission distance
Solution Approach 1:
The patent applies local quality by restricting the enlarged mode field diameter modification only to the spatial joining part where optical connection occurs, rather than applying it throughout the entire fiber length. This ensures connection tolerance is improved at the critical interface while the transmission sections maintain standard characteristics for reliable communication.
Solution Approach 2:
The fiber is segmented into functional zones: connection zones with enlarged mode field diameter for tolerance to misalignment, and transmission zones with standard parameters for reliable signal propagation. This segmentation allows the patent to optimize each zone for its specific function without compromising the other.
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 enhances the quality of optical communication by reducing signal variations and crosstalk, improving signal strength and reducing manufacturing complexities.
Implementation Method 1
the first coupled MCF having a mode field diameter (MFD) larger than a MFD of the first uncoupled MCF. In the first coupled MCF and the second coupled MCF, crosstalk is periodically produced along length directions of the MCFs
Implementation Method 2
fusion-splicing, between the first uncoupled MCF and the second uncoupled MCF, a coupled MCF having the length L and having an MFD larger than an MFD of the uncoupled MCF
Implementation Method 3
heating an uncoupled MCF to prepare, between the first uncoupled MCF and the second uncoupled MCF, a coupled MCF having an MFD larger than an MFD of the uncoupled MCF
Data Source
AI summary
An optical module according to an embodiment includes a first optical component and a second optical component including a multicore fiber (MCF) and a spatial joining part. The first optical component includes a first uncoupled MCF having small optical coupling between cores and a first coupled MCF having a mode field diameter (MFD) larger than a MFD of the first uncoupled MCF. The second optical component includes a second uncoupled MCF having small optical coupling between cores and a second coupled MCF having a MFD larger than a MFD of the second uncoupled MCF. In the first coupled MCF and the second coupled MCF, crosstalk is periodically produced along the length direction of an MCF, and the total of the length of the first coupled MCF and the length of the second coupled MCF is a length L in which crosstalk is suppressed.