Compact Two-Stage Optical Amplifier Using Multicore Fiber
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Solution Overview
Problem
Current optical amplifiers for long-distance communication systems are costly, complex, and inefficient in amplifying data-modulated optical signals in space division multiplexing (SDM) systems, as they require multiple components for each spatial propagation mode and waveguide core, limiting the potential transmission bandwidth.
Innovation Solution
A two-stage optical amplifier using a multicore rare-earth doped optical fiber with a 3D waveguide coupler and a pump laser, which couples input SDM channels into multiple cores for amplification, reducing the number of components and complexity by using a single amplifier for multiple channels through a two-pass configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate amplifiers are used for each spatial propagation mode and waveguide core, then amplification coverage is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple amplification functions into a single multicore rare-earth doped optical fiber amplifier. Multiple waveguide cores are integrated within one fiber, allowing simultaneous amplification of multiple spatial propagation modes and wavelengths through a unified structure, thereby reducing the number of separate amplifier components needed
Solution Approach 2:
The multicore rare-earth doped optical fiber serves multiple functions: it amplifies different spatial propagation modes across different cores, supports multiple wavelengths through rare-earth dopant transitions, and provides integrated pumping through the cladding. This multi-functional design eliminates the need for separate amplifiers for each function
2Adaptability or versatility
If multiple separate amplifiers are used for each spatial propagation mode and waveguide core, then amplification coverage is improved, but cost increases
Solution Approach 1:
The patent combines multiple amplification functions into a single multicore rare-earth doped optical fiber amplifier. Multiple waveguide cores are integrated within one fiber, allowing simultaneous amplification of multiple spatial propagation modes and wavelengths through a unified structure, thereby reducing the number of separate amplifier components needed
Solution Approach 2:
The multicore rare-earth doped optical fiber serves multiple functions: it amplifies different spatial propagation modes across different cores, supports multiple wavelengths through rare-earth dopant transitions, and provides integrated pumping through the cladding. This multi-functional design eliminates the need for separate amplifiers for each function
3Reliability
If traditional amplification methods are used, then amplification function is achieved, but volume and complexity increase
Solution Approach 1:
The patent embeds multiple waveguide cores within a single optical fiber structure, where each core contains rare-earth dopants. The fiber itself is nested within a compact amplifier housing with integrated pumping optics, creating a highly compact configuration that reduces overall amplifier volume while maintaining multiple amplification functions
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 solution effectively amplifies SDM channels with reduced cost, volume, and complexity, increasing the potential transmission bandwidth by using a single multicore optical amplifier fiber to handle multiple channels, thereby overcoming the limitations of existing amplifiers.
Implementation Method 1
a pump laser coupled to the multicore rare-earth doped optical fiber configured to produce laser pump light to pump the multicore rare-earth doped optical fiber
Implementation Method 2
All-optical amplification has been performed using laser pumping of a fiber doped with rare-earth dopant atoms
Implementation Method 3
a reflector configured to optically interconnect the first plurality of cores to the second plurality of cores
Implementation Method 4
a three dimensional (3D) waveguide configured to couple input space division multiplexed (SDM) channels into the first plurality of cores
Data Source
AI summary
Various exemplary embodiments relate to an optical amplifier, including: a multicore rare-earth doped optical fiber with a first plurality of cores associated with a first stage of the optical amplifier and a second plurality of cores associated with a second stage of the optical amplifier; a three dimensional (3D) waveguide configured to couple input space division multiplexed (SDM) channels into the first plurality of cores at a first end of the multicore rare-earth doped optical fiber and to couple channels from the second plurality of cores to output SDM channels; a reflector configured to optically interconnect the first plurality of cores to the second plurality of cores; and pump laser coupled to the multicore rare-earth doped optical fiber configured to produce laser pump light to pump the multicore rare-earth doped optical fiber.