Compact Passive Module for Erbium Fiber Amplifiers
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Solution Overview
Problem
Existing erbium-doped fiber amplifiers require extensive labor and are costly due to numerous inter-component fiber splicing joints, making them fragile and expensive, with a need for compact, low-cost, and easy-to-manufacture solutions with a broad operating wavelength range and enhanced performance.
Innovation Solution
Integration of all passive components using free-space optics to reduce the need for fiber splicing joints, eliminating unnecessary fibers and lenses, and integrating multiple pump stages into a single optical unit on a compact substrate, enhancing optical performance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional fiber splicing method is used to connect components, then optical signal transmission is achieved, but manufacturing complexity and labor cost increase significantly
Solution Approach 1:
The patent integrates multiple passive components (isolators, WDM filters, tap couplers, GFF) onto a single substrate, merging what were previously separate fiber-connected components into one unified device. This eliminates the need for multiple fiber splicing joints between components, directly reducing manufacturing complexity and labor cost while maintaining optical signal transmission functionality.
Solution Approach 2:
The integrated substrate serves multiple functions simultaneously: it provides mechanical support for all passive components, establishes optical pathways between them, and enables signal transmission without requiring external fiber connections for each component. This multi-functionality reduces the overall device complexity and number of inter-component connections.
2Reliability
If multiple passive components are integrated using fiber splicing, then optical amplifier functionality is achieved, but device fragility increases
Solution Approach 1:
By integrating all passive components onto a single robust substrate, the patent eliminates multiple fragile fiber splicing joints that are prone to breakage. The unified structure reduces points of failure and improves overall device reliability while maintaining the necessary optical amplifier functionality.
3Area of stationary object
If traditional component integration is used, then optical amplifier performance is achieved, but device footprint and cost increase
Solution Approach 1:
The patent consolidates multiple discrete passive components into a single integrated substrate, dramatically reducing the device footprint. All components that previously occupied separate spaces and required individual mounting are now compactly arranged on one substrate, reducing overall device size while managing integration complexity through unified design.
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 reduces insertion loss, component cost, and manufacturing complexity, providing improved reliability and a smaller footprint with a broad operating wavelength range and enhanced performance.
Implementation Method 1
A Wavelength Division Multiplexing (WDM) filter 110 is provided to couple an external laser (e.g., at 980 nanometers) into the signal 102
Implementation Method 2
An optical fiber is doped with the rare earth element erbium so that the glass fiber can absorb light at one frequency and emit light at another frequency
Implementation Method 3
A WDM filter 110 is provided to couple an external laser (e.g., at 980 nanometers) into the signal 102 that then goes through an EDFA 114 to be amplified
Data Source
AI summary
Techniques for designing optical devices with passive components for erbium and other doped fiber amplifiers are disclosed. In one aspect, all passive components needed to construct optical amplifiers of both single and multiple-stage forward or backward pumps are integrated without extensively using optical fiber splicing joints. One of the features is to use free-space optics for inter-function cascades among various necessary functions, such as one or more tap couplings, WDM filtering to multiplex (Mux) or de-multiplex (Demux) pump and signal lights, gain-flattening, pump isolation and even performing Mux and Demux of different polarizations.