MIMO Communication via Multimode Fiber Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multimode fiber optics face issues with signal distortion and limited bandwidth due to multiple modes, leading to data transmission errors over long distances, which hinder their cost-effective use in communication systems.
Innovation Solution
A multiple input, multiple output (MIMO) communication system utilizing an array of emitters and detectors with a multimode medium, such as multimode fiber, to demultiplex and multiplex signals, effectively using modal dispersion and chromatic dispersion to enhance bandwidth and correct transmission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multimode fiber is used for communication, then cost is reduced, but bandwidth and transmission distance are limited due to signal distortion
Solution Approach 1:
The invention segments the single data stream into multiple parallel streams, which are then transmitted through multiple emitters and detectors. This segmentation allows the system to overcome the bandwidth limitations of individual multimode fiber channels while maintaining cost effectiveness by utilizing the existing multimode infrastructure.
Solution Approach 2:
The invention transitions from a single-input single-output (SISO) communication model to a multiple-input multiple-output (MIMO) model, adding spatial dimensionality to the transmission system. By using multiple emitters and detectors arranged in arrays, the system exploits spatial multiplexing to achieve higher bandwidth and extended transmission distances.
2Reliability
If single mode fiber is used for communication, then bandwidth and transmission distance are improved, but cost increases
Solution Approach 1:
The invention creates multiple copies of the data stream through parallel transmission channels using multiple emitters and detectors. These copied streams are transmitted simultaneously through multimode fiber and then recombined at the receiver, achieving single-mode-like performance through spatial diversity without requiring expensive single-mode infrastructure.
Solution Approach 2:
The MIMO communication system provides a universal solution that can operate over existing multimode fiber infrastructure while achieving performance characteristics previously only available from single-mode systems. This multi-functionality allows the system to serve both cost-sensitive applications and high-performance requirements.
3Length of stationary object
If multimode fiber transmits signals over long distances, then coverage is extended, but signal distortion increases causing data transmission errors
Solution Approach 1:
The invention implements feedback mechanisms through multiple detection channels that monitor the quality of transmitted signals. The receiver uses information from multiple detectors to detect and correct errors, compensating for signal distortion that occurs over long transmission distances through multimode fiber.
Solution Approach 2:
The system prepares for potential signal degradation by using multiple parallel transmission paths before distortion becomes problematic. The diversity of multiple modes and paths provides redundancy that cushions against the effects of long-distance transmission errors, allowing reliable communication over extended distances.
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 MIMO system increases bandwidth and reduces bit error rates, achieving higher data rates and longer ranges while maintaining lower costs, making it suitable for applications where single mode fiber is not economically viable.
Implementation Method 1
A light source can include a light emitting diode (LED) or a laser, for example, that provides a signal converted into light pulses
Implementation Method 2
In a multimode fiber, light waves travel in numerous paths, or modes, through the fiber
Implementation Method 3
The receiver can then convert the light pulses back into the original signal
Data Source
AI summary
Multiple input, multiple output (MIMO) communication systems and a method using multimode media are provided. A MIMO communication system includes an array of emitters that receives a data signal and outputs a plurality of signals (e.g., modulated light, or other signal types) representative of the data signal, a multimode medium (e.g., a multimode fiber, a fiber bundle, a bundle of cables) that receives the plurality of signals from the array of emitters and carries the plurality of signals in a plurality of modes, and an array of detectors that receives the plurality of signals carried by the multimode medium and outputs the data signal. The system can include a demultiplexer that demultiplexes a single high-speed data stream into the array of emitters as the data signal. The system can also include a multiplexer that multiplexes the data signal from the array of detectors back into the single high-speed data stream.