C+L Band Optical Amplifier Pumping Efficiency
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Solution Overview
Problem
Conventional C+L band EDFA systems face increased power consumption and application costs due to low pumping efficiency, particularly in the L band EDFA, leading to a need for improved pumping efficiency in optical amplification systems.
Innovation Solution
An optical amplification system that includes a first amplification module for the C band and a second amplification module for the L band, with an adjustable attenuator to attenuate part of the C band optical signal and use it as auxiliary pumping for the L band module, thereby reducing pumping energy demand and enhancing efficiency without affecting overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If C band EDFA and L band EDFA are connected in parallel to amplify both bands, then both C band and L band optical signals can be amplified simultaneously, but total pumping power demand is doubled or even more compared to single C band EDFA
Solution Approach 1:
The patent combines the C band EDFA and L band EDFA into a shared amplification system where both bands use a common Erbium-doped fiber amplifier core. The C band signal and L band signal traverse the same erbium-doped fiber, allowing simultaneous amplification while sharing pumping resources, thus avoiding the need for completely separate pump sources for each band.
Solution Approach 2:
The erbium-doped fiber amplifier is designed to perform multiple functions by amplifying both C band and L band signals through the same physical medium. The single erbium-doped fiber serves as the gain medium for both wavelength bands, making the system multi-functional and reducing the need for separate amplification paths.
2Reliability
If C band EDFA and L band EDFA are connected in parallel, then independent amplification of each band is achieved, but power consumption and application costs are increased
Solution Approach 1:
The patent merges the amplification functions for C band and L band into a single shared erbium-doped fiber amplifier system. Both wavelength bands are amplified simultaneously within the same erbium-doped fiber, allowing independent amplification capability while sharing the pumping infrastructure, thus reducing overall power consumption.
3Productivity
If L band EDFA uses conventional pumping methods, then L band optical signal amplification is achieved, but pumping efficiency remains low
Solution Approach 1:
The patent converts the typically wasted amplified spontaneous emission (ASE) noise generated during C band amplification into a beneficial resource for L band amplification. The ASE noise generated in the C band is redirected through wavelength division multiplexing to pump the L band signal, transforming what would be harmful noise into useful pumping energy and significantly improving overall system efficiency.
Solution Approach 2:
Instead of discarding the ASE noise generated during C band amplification, the system recovers and utilizes this energy for L band signal amplification. The ASE noise that would normally be lost is captured through optical filtering and wavelength division multiplexing to serve as a pump source for the L band, thereby recovering wasted energy.
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 system effectively increases pumping efficiency by utilizing attenuated C band signals as auxiliary pumping for the L band amplification module, reducing energy demand and costs while maintaining system performance.
Implementation Method 1
a first amplification module, where the first amplification module is configured to amplify at least a conventional band C band optical signal; a second amplification module, where the second amplification module is configured to amplify a longer wavelength band L band optical signal
Implementation Method 2
an attenuator, configured to attenuate at least a part of the C band optical signal amplified by the first amplification module and transparently transmit the other part of the C band optical signal amplified by the first amplification module
Implementation Method 3
the wavelength division multiplexing module, where the wavelength division multiplexing module is configured to combine the optical signal amplified and output a combined signal
Data Source
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AI summary
An optical amplification system includes: a first amplification module (210), configured to amplify at least a conventional band C band optical signal; a second amplification module (220), configured to amplify a longer wavelength band L band optical signal; an attenuator (230), where the attenuator (230) is configured to attenuate at least the C band optical signal amplified by the first amplification module (210), to obtain a first optical signal and a second optical signal, and the attenuator (230) is further configured to output the first optical signal to the second amplification module (220), and output the second optical signal to a wavelength division multiplexing module, where the first optical signal is used to perform auxiliary pumping for the second amplification module (220), and the first optical signal is attenuated light of the C band optical signal amplified by the first amplification module (210); and the wavelength division multiplexing module, configured to combine and output the optical signal amplified and output by the first amplification module (210) and the L band optical signal amplified and output by the second amplification module (220). Therefore, pumping efficiency of the optical amplification system can be improved.