Multi-Core Optical Amplifier for Wavelength-Dependent Gain Control
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Solution Overview
Problem
Existing optical amplifiers exhibit significant wavelength-dependent gain variations, leading to inefficient use of power resources due to excessive amplification and subsequent attenuation of certain wavelengths, particularly when high wavelength filling rates occur.
Innovation Solution
An optical amplifier with multiple cores, including a wavelength demultiplexing and multiplexing system that monitors and controls the amplification rate of specific wavelength bands, allowing separate amplification and multiplexing of signals with varying efficiency, optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical amplifier amplifies all wavelength bands uniformly beyond the desired gain to ensure adequate amplification for wavelengths with low gain, then the signal gain for wavelengths with low amplification efficiency is improved, but energy is wasted due to excessive amplification of wavelengths with high amplification efficiency that subsequently require attenuation
Solution Approach 1:
The incident WDM signal is demultiplexed into multiple wavelength bands, and each wavelength band is amplified separately in different cores of the optical amplifier. This segmentation allows independent gain control for each wavelength band, preventing the need to over-amplify all wavelengths uniformly and subsequently attenuate some of them, thereby improving power resource efficiency while ensuring adequate signal gain for all wavelengths
Solution Approach 2:
Different amplification rates are applied to different wavelength bands based on their specific amplification efficiency characteristics. Wavelength bands with relatively small optical amplification efficiency are amplified with relatively large amplification rates, while wavelength bands with high amplification efficiency are amplified with appropriate rates, avoiding excessive amplification and subsequent energy-wasting attenuation
2Device complexity
If the optical amplifier uses a single core for amplification, then the device structure is simple, but significant wavelength-dependent gain variations occur leading to inefficient power usage
Solution Approach 1:
The optical amplifier employs multiple cores instead of a single core, with each core dedicated to amplifying specific wavelength bands. This segmentation enables independent optimization of amplification parameters for each wavelength band, eliminating the wavelength-dependent gain variations that occur in single-core amplifiers and improving overall power resource efficiency
Solution Approach 2:
The optical amplifier with multiple cores can simultaneously amplify multiple wavelength bands with different amplification characteristics, making it a universal solution that handles various wavelength requirements efficiently in a single device, rather than requiring separate amplifiers for different wavelength bands
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 reduces wavelength dependency and enhances the efficiency of power resource utilization by ensuring appropriate amplification rates for each wavelength band, thereby minimizing energy loss and consumption.
Implementation Method 1
activates erbium ions in an optical fiber by using excitation light of a 0.98-μm band or a 1.48-μm band, and uses laser transition of the 1.55-μm band possessed by the erbium
Implementation Method 2
inputs excitation light being output from an excitation light source to a rare earth element doped fiber
Data Source
AI summary
An optical amplifier that amplifies an incident WDM signal and includes cores having an amplification medium, the optical amplifier includes: a wavelength demultiplexer configured to demultiplex the incident WDM signal into wavelength bands and introducing the demultiplexed WDM signals into the cores separately; a wavelength multiplexer configured to multiplex amplified optical signals propagated through the cores and outputting the multiplexed signal; and an wavelength demultiplexing controller configured to monitor an amplification rate of a specific wavelength band of an amplified WDM signal or a scale associated with an amplification rate of a specific wavelength band, demultiplexing, from the incident WDM signal, an optical signal of a wavelength band having relatively-small optical amplification efficiency according to a monitoring result, and controlling demultiplexing performed by the wavelength demultiplexer in such a way as to amplify, with a relatively-large amplification rate, the optical signal of the wavelength band having relatively-small optical amplification efficiency.