Multi-core optical fiber lateral separation crosstalk
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Solution Overview
Problem
Existing optical communication systems using multi-mode optical fibers face challenges in managing optical crosstalk between cores, which complicates the design and scalability of data transmission rates, as current technologies struggle to maintain insubstantial cross-talk while supporting a moderate number of propagating modes per core.
Innovation Solution
The development of multi-core optical fibers with laterally separated cores, where each core supports a small to moderate number of orthogonal propagating modes, and the use of optical communication devices that compensate for intra-core crosstalk without addressing inter-core crosstalk, allowing for parallel data transmission with reduced hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-mode optical fibers are used to support multiple propagating modes per core, then data transmission rate increases, but optical crosstalk between cores becomes significant and complicates system design
Solution Approach 1:
The invention divides the optical fiber into multiple spatially separated cores, each supporting a limited number of propagating modes. By laterally separating the cores and limiting modes per core, the system achieves high aggregate bandwidth while keeping inter-core crosstalk insubstantial, thus avoiding the complexity of managing crosstalk in traditional multi-mode fibers
2Productivity
If the number of propagating modes per core is increased, then data transmission capacity increases, but hardware complexity for managing crosstalk increases
Solution Approach 1:
Each optical core is designed with specific local properties (supporting only a limited number of propagating modes) to ensure insubstantial inter-core crosstalk. This local quality control at the core level eliminates the need for complex hardware to manage crosstalk, as each core independently maintains low crosstalk characteristics
3Object-affected harmful factors
If lateral separation between cores is increased, then inter-core crosstalk decreases, but fiber cross-sectional area increases
Solution Approach 1:
The invention utilizes the lateral spatial dimension within the fiber cross-section to position multiple cores at optimized separations. By carefully designing the lateral arrangement and separation distances, the system achieves insubstantial crosstalk while maintaining a practical fiber cross-sectional area suitable for standard deployment
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 enables easier scalability of data communication rates by minimizing the need for complex hardware to manage inter-core crosstalk, maintaining low propagation delay, and simplifying the fabrication and connection of optical modulators and demodulators, thus enhancing the overall efficiency of optical communication systems.
Implementation Method 1
each optical core is able to support a number of orthogonal propagating optical modes at telecommunications wavelengths
Implementation Method 2
optical cross-talk between the optical cores may be insubstantial over the length of the optical fiber
Data Source
AI summary
An apparatus includes an optical fiber having a plurality of optical cores therein. Each optical core is located lateral in the optical fiber to the remaining one or more optical cores and is able to support a number of propagating optical modes at telecommunications wavelengths. Each number is less than seventy.