Multi-Core Optical Amplification With Reduced Coherence Crosstalk
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Solution Overview
Problem
The performance indices of optical amplifiers using coupled multi-core optical fibers fluctuate over time due to crosstalk, making performance evaluation and system design challenging, especially in long-distance light transmission systems.
Innovation Solution
A light amplification device and method that control the wavelength band of optical carrier waves to generate band control light, which is amplified through multiple light amplification media while reducing coherence to mitigate crosstalk effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of cores and modes of an optical fiber are increased to expand communication capacity, then communication capacity is improved, but compatibility with existing optical transmitters/receivers and optical amplifiers deteriorates
Solution Approach 1:
The invention segments the optical signal amplification process by introducing a wavelength selective switch that separates different wavelength bands. This allows different cores to be amplified by different optical amplifiers, enabling the system to handle multi-core optical fibers while using existing single-core amplifier technology. The segmentation of the amplification function resolves the contradiction between increased core count and equipment compatibility.
2Area of stationary object
If a coupled multi-core optical fiber is used to increase core density, then the number of cores that can be arranged is improved, but crosstalk between cores increases
Solution Approach 1:
The invention segments the wavelength spectrum into multiple bands using a wavelength selective switch, assigning different wavelength bands to different cores. This spectral segmentation reduces inter-core crosstalk by separating the optical signals in the wavelength domain, allowing dense core arrangement while maintaining signal integrity.
Solution Approach 2:
The wavelength selective switch acts as an intermediary device that mediates between the coupled multi-core optical fiber and the optical amplifiers. It separates the combined optical signals from multiple cores into distinct wavelength bands, preventing crosstalk from propagating through the amplification stage and enabling effective use of dense core arrangements.
3Use of energy by moving object
If cladding pumping method is used to collectively amplify optical signals, then amplification efficiency is improved, but performance indices fluctuate over time due to crosstalk
Solution Approach 1:
The invention segments the amplification process by using separate optical amplifiers for different wavelength bands instead of a single collective amplification system. The wavelength selective switch directs different wavelength bands to different amplifiers, preventing crosstalk from affecting the entire system simultaneously. This segmentation maintains amplification efficiency while improving performance stability over time.
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
Enables performance evaluation and construction of stable light transmission systems using coupled multi-core optical fibers by suppressing time fluctuations in optical signal intensity.
Implementation Method 1
a band control light amplification means including a plurality of light amplification media through which the band control light propagates. The band control light amplification means amplifies the band control light
Data Source
AI summary
Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a light carrier to generate a band control light; and a band control light amplification means that has a plurality of light amplification media through which the band control light propagates, wherein the band control light amplification means amplifies the band control light in a coupled state in which the light propagating through the plurality of light amplification media induces a crosstalk and wherein the band control means controls the wavelength band such that the band control light having propagated through the plurality of light amplification media has a reduced coherence.