Multi-Core Optical Fiber Pump Coupling for Gain Uniformity
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Solution Overview
Problem
Existing optical amplifiers for coupled-core multi-core optical fibers suffer from significant gain variation among cores and low efficiency in utilizing pump light, leading to reduced MIMO signal processing effectiveness and increased costs due to the need for multiple components to couple pump light to each core.
Innovation Solution
An optical amplifier system utilizing a multi-core optical fiber with a high inter-core crosstalk of -17 dB or greater, where pump light is efficiently coupled between cores using a connecting multi-core fiber with a pump light source, ensuring uniform gain distribution and increased pump light utilization by overlapping pump light and rare-earth elements over a large area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump light is coupled to each core using separate components, then pump light can be delivered to each core, but device complexity and cost increase
Solution Approach 1:
The patent merges the pump light delivery function into a single integrated multi-core optical fiber that can distribute pump light to multiple amplifier cores simultaneously. This eliminates the need for separate coupling components for each core, reducing device complexity while maintaining reliable pump light delivery to all cores through the fiber's inherent multi-core structure
2Measurement precision
If inter-core crosstalk is suppressed to maintain signal integrity, then MIMO signal processing effectiveness improves, but pump light coupling efficiency decreases
Solution Approach 1:
The patent optimizes the inter-core crosstalk parameter to a specific range (-17 dB or greater) that balances two competing requirements: maintaining sufficient signal integrity for MIMO processing while enabling effective pump light coupling between cores. This parameter optimization allows the system to achieve both goals simultaneously rather than treating them as mutually exclusive
3Reliability
If multiple components are used to couple pump light to each core, then pump light can be delivered to each core, but manufacturing precision requirements increase
Solution Approach 1:
By integrating pump light delivery into a single multi-core fiber component rather than using multiple separate coupling components, the patent eliminates the need for precise alignment between multiple components. The inherent structural integration of the multi-core fiber reduces manufacturing precision requirements while ensuring reliable pump light delivery to all amplifier cores
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 solution achieves uniform gain among cores, enhances pump light utilization efficiency, and reduces the complexity and cost of the optical amplifier system by effectively coupling pump light to multiple cores, thereby improving MIMO signal processing and reducing manufacturing errors.
Implementation Method 1
an optical amplifier including an amplifying multi-core optical fiber... the amplifying multi-core optical fiber has an absorption coefficient of 1 [dB/m] or greater at a pump wavelength at which the rare-earth element is pumped
Implementation Method 2
a connecting multi-core optical fiber... with an inter-core crosstalk of −17 [dB] or greater at the pump wavelength... efficiently couple the pump light to a plurality of first cores
Data Source
AI summary
An optical amplifier is provided in which adjacent ones of a plurality of cores each containing a rare-earth element and included in an amplifying multi-core optical fiber (MCF) serve as coupled cores at an amplifying wavelength, a connecting MCF is connected to the amplifying MCF, a pump light source is connected to the connecting MCF, and the pump light source pumps the rare-earth element in the amplifying MCF through the connecting MCF.