Optical Amplifier Pump Power Control for OSNR and Distance
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Solution Overview
Problem
In optical communication systems, the use of optical amplifiers leads to noise accumulation, limiting transmission distance due to deteriorated optical signal noise ratio (OSNR), and the introduction of regenerators increases costs, while increasing pump light power to enhance transmission distance is costly and inefficient.
Innovation Solution
An optical amplification apparatus that adjusts pump light power based on the number of multiplexed wavelengths, optimizing amplification gain and reducing the number of regenerators needed, thereby improving OSNR and extending transmission distance at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical amplifiers are used to expand transmission distance, then transmission distance is improved, but optical signal noise ratio (OSNR) deteriorates due to noise accumulation
Solution Approach 1:
The patent changes the parameter of pump light power dynamically based on the number of multiplexed wavelengths. By adjusting pump light power according to wavelength count, the system optimizes amplification gain to maintain adequate OSNR while extending transmission distance, resolving the contradiction between distance extension and noise accumulation.
2Reliability
If regenerators are introduced to improve OSNR and expand transmission distance, then optical signal noise ratio (OSNR) is improved, but system cost increases
Solution Approach 1:
The patent extracts the essential function of regenerators (OSNR improvement) and implements it through a simplified approach: dynamically adjusting pump light power in optical amplifiers based on wavelength multiplexing count. This eliminates the need for expensive regenerators while achieving comparable OSNR improvement, reducing system cost significantly.
Solution Approach 2:
The patent replaces expensive regenerators with a cost-effective solution using standard optical amplifiers with adjustable pump power. This substitution uses cheaper components (standard amplifiers rather than regenerators) to achieve the same functional outcome of OSNR improvement.
3Length of stationary object
If pump light power is increased to expand transmission distance without using regenerators, then transmission distance is improved, but optical amplifier cost increases
Solution Approach 1:
The patent makes the pump light power dynamic rather than static. The control unit adjusts pump light power levels based on the actual number of multiplexed wavelengths, optimizing the balance between transmission distance extension and amplifier cost. This dynamic adjustment prevents unnecessary cost increase while achieving distance expansion.
Solution Approach 2:
The patent changes the parameter of pump light power based on wavelength multiplexing conditions. By adjusting this parameter dynamically, the system achieves transmission distance expansion only when and where needed, avoiding unnecessary cost increases from consistently high pump power settings.
4Productivity
If the number of multiplexed wavelengths is increased to expand communication capacity, then communication capacity is improved, but transmission optical power per wavelength decreases
Solution Approach 1:
The patent changes the parameter of pump light power in response to the number of multiplexed wavelengths. When more wavelengths are multiplexed to increase capacity, the control unit increases pump light power accordingly to maintain transmission optical power per wavelength, resolving the trade-off between capacity and power.
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 enhances transmission distance and reduces the number of regenerators required, improving OSNR and lowering the overall cost of the optical transmission system by efficiently managing pump light power and wavelength multiplexing.
Implementation Method 1
an optical amplifier that amplifies the wavelength-division multiplexed light in response to a power level of the pump light
Data Source
AI summary
An optical amplification apparatus that amplifies input wavelength-division multiplexed light includes a pump light source that outputs pump light, and an optical amplifier that amplifies the wavelength-division multiplexed light in response to a power level of the pump light. The number of wavelengths multiplexed in the wavelength-division multiplexed light is equal to or less than the maximum available number of wavelengths input to the optical amplification apparatus. The power level of the pump light is determined based on the maximum available number of wavelengths.