SDM Optical Amplifier Pump Sharing Under Power Limits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power-limited optical communication systems face challenges in increasing transmission capacity due to limited electrical power, which restricts the availability of high optical channel output power and amplifier pump power, especially for wide system bandwidths, making it difficult to implement multi-level modulation techniques and coherent receivers effectively.
Innovation Solution
The implementation of spatial division multiplexing (SDM) optical communication systems with a pump assembly that includes an optical pump unit (OPU) with multiple pumps providing redundancy, coupled to splitters that distribute pump power to multiple optical amplifiers along different dimensions of multi-core or multi-mode fibers, allowing for increased transmission capacity without exceeding maximum power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial division multiplexing is implemented to increase transmission capacity, then data capacity is improved, but power consumption increases
Solution Approach 1:
Multiple pump laser sources that would traditionally require separate power supplies are merged into a single power supply unit. The power supply receives a single electrical power input and distributes power to multiple pump sources through internal power distribution circuits, thereby reducing the number of power supplies needed and lowering overall power consumption while maintaining the ability to drive multiple pump lasers for SDM transmission.
Solution Approach 2:
The single power supply unit is designed to serve multiple functions simultaneously - it powers multiple pump laser sources with different power requirements, provides redundancy through internal power distribution paths, and maintains stable operation across varying load conditions. This multi-functional design eliminates the need for separate dedicated power supplies for each pump source.
2Reliability
If multiple pump sources are used to provide redundancy and increase capacity, then reliability is improved, but device complexity increases
Solution Approach 1:
Multiple pump laser sources are powered by a single integrated power supply unit rather than having separate power supplies for each pump. The power supply internally distributes power to multiple pump sources through power distribution circuits, reducing the total number of power supply components while maintaining the ability to provide redundancy across multiple pumps.
Solution Approach 2:
The power supply acts as an intermediary component that mediates between the single electrical power input and multiple pump laser sources. It contains internal power distribution paths and control circuits that manage power allocation to different pumps, simplifying the overall system architecture by eliminating the need for multiple external power supply units.
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 configuration enables increased transmission capacity compared to non-SDM systems while maintaining power consumption at or below existing levels, allowing for efficient amplification of signals across multiple dimensions without requiring separate pump sources for each dimension, thus overcoming power limitations.
Implementation Method 1
The optical amplifier includes a plurality of pump radiation sources, each pump radiation source adapted to produce radiation having a set of pump wavelengths and pump powers
Implementation Method 2
a rare-earth doped optical amplifier, such as an EDFA, operates by passing an optical signal through a doped fiber segment, and 'pumping' the segment with light from another source such as a laser
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In optical amplifier assembly [308-1..308-n] for a spatial division multiplexing (SDM) optical communication system [300], each optical amplifier assembly [308-1..308-n] includes a single pump assembly [318-1..318N] configured for causing amplification of signals traveling on separate fiber paths [310e, 310w] in different directions. Each fiber path [310e, 310w] includes a plurality of spatial dimensions. The single pump assembly [318- 1..318N] includes a plurality of pump sources to provide redundancy and the optical amplifier assembly [308-1..308-n] further includes splitters [330a, 330b] for splitting outputs of the pump sources to amplifiers coupled to the different spatial dimensions.