Integrated EDFA Optical Module for Compact Signal Isolation
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Solution Overview
Problem
Existing erbium-doped fiber amplifiers (EDFAs) face challenges due to expensive and complex optical modules, as well as a complex optical fiber fusion process required to join multiple optical modules together.
Innovation Solution
The development of a compact optical module for EDFAs with a simplified structure, incorporating an optical fiber component, a walk-off birefringent crystal, a collimating lens, wave plates, a Faraday rotator, a WDM filter, and an optical detecting component, which reduces the number of components and fiber connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical modules are used in EDFA, then the amplifier can achieve signal amplification, but the optical module structure becomes complex and expensive
Solution Approach 1:
The patent combines multiple optical components (isolator, wave plates, Faraday rotator, WDM filter, mirror, and optical fiber) into a single integrated optical module. This merging of components simplifies the overall structure, reduces the number of separate parts, and eliminates the need for complex fiber fusion connections while maintaining the signal amplification capability through the coordinated function of each integrated component.
2Reliability
If multiple optical modules are joined together, then the EDFA can function, but the fiber fusion process becomes complex and time-consuming
Solution Approach 1:
By integrating all necessary optical components into a single module, the patent eliminates the need to join multiple separate optical modules through fiber fusion. The integrated design allows for simpler manufacturing processes and reduces the complexity of assembly operations.
Solution Approach 2:
The patent segments the EDFA system into distinct functional modules (optical module and EDF component) that can be manufactured and tested independently, then connected through simple interfaces. This segmentation allows each module to be optimized separately while simplifying the overall assembly process.
3Adaptability or versatility
If traditional optical modules with multiple components are used, then comprehensive optical functions are achieved, but the overall device size increases
Solution Approach 1:
The patent employs a nested arrangement where smaller optical components (wave plates, Faraday rotator, WDM filter) are positioned within a compact configuration inside the optical module. This nesting allows multiple functional elements to occupy minimal space while maintaining their individual optical functions, thereby reducing the overall device volume.
Solution Approach 2:
The patent optimizes the spatial arrangement of optical components by utilizing three-dimensional positioning and angular orientations (e.g., specific angles of wave plates and Faraday rotator). This dimensional optimization allows components to be arranged efficiently in space, achieving comprehensive optical functions within a compact footprint.
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 results in a smaller, more reliable, and cost-effective EDFA with reduced fiber fusion connections, enhancing the amplifier's performance and efficiency.
Implementation Method 1
a walk-off birefringent crystal, a collimating lens
Implementation Method 2
a Faraday rotator
Implementation Method 3
a wavelength division multiplexing (WDM) filter, and the WDM filter passes the signal light and the amplified signal light, and reflects the pump light
Implementation Method 4
a mirror and an optical detecting component. The optical fiber component, the walk-off birefringent crystal, the first and the second wave plates, the collimating lens, the WDM filter, the Faraday rotator and the mirror are arranged and oriented with respect to each other so that the signal light input from the first fiber and the pump light input from the second fiber are reflected and coupled to the third fiber
Data Source
AI summary
An optical module includes an optical fiber component, a wavelength division multiplexing (WDM) filter, at least one isolator, a mirror and an optical detecting component. The optical fiber component, the WDM filter, the at least one isolator, the mirror and the optical detecting component are configured to prevent a signal light which is before an EDF component and an amplified signal light after the EDF component from counter transmission with a simplified structure and compact size.