Doped Fiber Optical Amplification with ASE Filtering
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Solution Overview
Problem
Conventional optical signal amplifiers face inefficiencies due to spontaneous and amplified spontaneous emissions in doped optical fibers, which consume rare earth particles and reduce pumping efficiency.
Innovation Solution
An optical signal amplification apparatus with a combiner assembly, doped optical fiber, and optical filter is used to combine and amplify signal beams while filtering out emissions, thereby reducing spontaneous and amplified spontaneous emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a doped optical fiber amplifier is used to amplify optical signals, then optical signal amplification is achieved, but spontaneous emission and amplified spontaneous emission consume rare earth particles and reduce pumping efficiency
Solution Approach 1:
The patent extracts and removes the harmful spontaneous emission and amplified spontaneous emission components from the optical fiber using optical filters. By filtering out these unwanted emissions, the system prevents consumption of rare earth particles by spontaneous emission processes, thereby improving pumping efficiency while maintaining optical signal amplification capability.
2Illumination intensity
If rare earth particles in metastable state perform spontaneous emission, then photons are released, but metastable particles available for stimulated emission are reduced
Solution Approach 1:
The patent converts the harmful effect of spontaneous emission into a beneficial process by using optical filters to selectively remove spontaneous emission photons while allowing signal photons to pass. This enables the system to manage spontaneous emission constructively - the filters prevent spontaneous emission photons from traveling back through the doped fiber and causing additional particle transitions, thereby preserving metastable rare earth particles for signal amplification.
3Object-generated harmful factors
If noise light is transmitted in the doped optical fiber, then rare earth particles are induced to transit to ground state, but amplification of signal light is reduced
Solution Approach 1:
The patent extracts and removes noise light components from the optical fiber using optical filters positioned to filter light traveling in the noise light direction. By removing noise light before it can be amplified by stimulated emission processes, the system prevents consumption of metastable rare earth particles by noise light, thereby preserving particles for signal light amplification and improving overall signal amplification performance.
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
Improves pumping efficiency and amplification efficiency by minimizing the consumption of rare earth particles at high energy levels in the doped optical fiber.
Implementation Method 1
a basic principle of amplifying an optical signal by a doped optical fiber amplifier is that rare earth particles in a ground state in a doped optical fiber may transfer to a metastable state under the action of a pump light source, and then stimulated emission occurs in the rare earth particles in the metastable state under excitation by the optical signal
Implementation Method 2
the rare earth particles in the metastable state transit to the ground state under the excitation of the optical signal, and photons that are the same as photons of the optical signal (for example, in a same direction, a same wavelength, and a same phase) are released, so as to amplify the optical signal
Implementation Method 3
The optical filter is disposed between two ends of the doped optical fiber. The optical filter is configured to transmit the signal beam in the doped optical fiber and is configured to filter out a first beam in the doped optical fiber. The first beam includes a beam of some wavelengths or a beam of all wavelengths generated by spontaneous emission in the doped optical fiber
Data Source
AI summary
An optical signal amplification apparatus and a related optical communication device. The apparatus may include a pump light source, a combiner assembly, a doped optical fiber, and an optical filter. The pump light source may be configured to emit a pump beam. The combiner assembly is configured to combine a signal beam and the pump beam and couple a combined beam into the doped optical fiber. The doped optical fiber is configured to amplify the signal beam under excitation by the pump beam. The signal beam includes one or more single-wavelength signals. The optical filter is disposed between two ends of the doped optical fiber and configured to transmit the signal beam and filter out a first beam in the doped optical fiber. The first beam includes a beam of some wavelengths or all wavelengths generated by spontaneous emission in the doped optical fiber.