Switchable Gain Optical Amplifier with Circulator and Dual Stages
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Solution Overview
Problem
Conventional optical amplifiers for fiber-optic communication have high cost, large volume, and complex control systems due to their narrow gain range and multiple components, which hinder their efficiency and scalability.
Innovation Solution
An optical amplifier design featuring a first and second amplifier stage, a circulator, and an output stage, where the first stage amplifies the input signal with a pump laser, and the second stage further amplifies using a bypass pump laser, allowing for switchable gain modes and reduced component count, thereby lowering cost and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifier stages with different gain ranges are used to achieve wide gain range, then the gain range is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple amplifier stages into a single integrated optical amplifier unit with a unified control system. The first and second amplifier stages are merged to operate cooperatively under one controller, reducing the need for separate control systems for each stage and simplifying the overall device architecture while maintaining wide gain range capability
Solution Approach 2:
The controller is designed to universally manage both the first and second amplifier stages, enabling a single control system to adjust and optimize the gain across the entire wide gain range. This multi-functional controller reduces device complexity by eliminating the need for separate control mechanisms for each amplifier stage
2Adaptability or versatility
If multiple amplifier stages are used to achieve wide gain range, then the gain range is improved, but the volume increases
Solution Approach 1:
The patent implements a nested architecture where the first and second amplifier stages are integrated in a compact arrangement, with components of one stage positioned within or adjacent to the other stage's components. This nesting approach allows multiple amplifier functions to coexist in a reduced volume compared to separate discrete stages
3Adaptability or versatility
If multiple laser pumps are used to achieve wide gain range, then the gain range is improved, but the control complexity increases
Solution Approach 1:
The controller is designed as a universal control system that manages both the first laser pump and the second laser pump through a unified control architecture. This multi-functional controller can adjust pump parameters for both lasers simultaneously, reducing control complexity compared to having separate control systems for each pump
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 design achieves a wide gain range with reduced component count and complexity, resulting in lower costs and smaller volume while maintaining amplification efficiency and noise suppression capabilities.
Implementation Method 1
an erbium doped fiber (113) for receiving the input optical signal and the input pump laser, amplifying the input optical signal by using the input pump laser, and outputting a first-stage amplified optical signal
Implementation Method 2
a circulator having a first terminal that is coupled to the first amplifier stage for receiving the first-stage amplified optical signal therefrom, a second terminal and a third terminal, and outputting the first-stage amplified optical signal at the second terminal
Implementation Method 3
a second amplifier stage for receiving the bypass pump laser and the first-stage amplified optical signal respectively therefrom, amplifying the first-stage amplified optical signal by using the bypass pump laser, and outputting a second-stage amplified optical signal
Data Source
AI summary
An optical amplifier includes two amplifier stages, a circulator and an output stage. The first amplifier stage amplifies an input optical signal, and provides a first-stage amplified optical signal that is to be outputted via the circulator to the second amplifier stage. The second amplifier stage amplifies the first-stage amplified optical signal, and outputs a second-stage amplified optical signal to the output stage. The output stage outputs a returned optical signal to the second amplifier stage, so that the second amplifier stage amplifies the returned optical signal, and provides a third-stage amplified optical signal that is to be outputted via the circulator and the output stage to serve as an output optical signal.