Optical PCB Amplification Module with Segmented Waveguides
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Solution Overview
Problem
As optical printed circuit boards (PCBs) increase in size, they face challenges with signal absorption due to waveguide materials, leading to optical losses, which cannot be fully mitigated by increasing input signal power without introducing distortion or degrading the signal.
Innovation Solution
An amplification module for optical PCBs is introduced, featuring plural polymer waveguide sections doped with amplifying dopants, where the waveguide sections are routed through an amplification zone with a pump source providing independently controllable levels of pump radiation, allowing for selective amplification of individual waveguides to compensate for varying losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher powered optical signals are provided along waveguides to compensate for signal absorption, then signal strength is improved, but power consumption of the light source increases
Solution Approach 1:
The waveguide is divided into passive sections and active amplifying sections. The passive sections transmit signals without amplification, while the active sections doped with lanthanides provide localized amplification through optical pumping, reducing the need for continuously high power input signals
Solution Approach 2:
Different sections of the waveguide have different properties: passive sections use standard low-loss polymer waveguide material, while active sections are doped with lanthanides (erbium, praseodymium, or neodymium) to provide amplification. This local differentiation allows signal strengthening only where needed without increasing overall power consumption
2Length of stationary object
If higher powered optical signals are provided to compensate for absorption over longer distances, then transmission distance is improved, but signal distortion increases
Solution Approach 1:
The waveguide is segmented into passive transmission sections and active amplifying sections. This segmentation allows the signal to be transmitted over long distances through passive sections and periodically regenerated in active sections, maintaining signal quality without requiring continuously high power that would cause distortion
Solution Approach 2:
The active sections provide continuous optical amplification along the transmission path through distributed pumping. This continuous amplification compensates for losses accumulated over long distances, enabling extended transmission without signal degradation or distortion
3Illumination intensity
If higher powered optical signals are used to overcome absorption losses, then signal strength is improved, but power density increases
Solution Approach 1:
The waveguide structure separates passive transmission regions from active amplifying regions. The active sections are doped with lanthanides and optically pumped to provide localized gain, reducing the need for high power density throughout the entire waveguide length
Solution Approach 2:
Optical pumping is applied locally to active sections rather than uniformly across the entire waveguide. This localized pumping creates population inversion only where needed, providing amplification without increasing overall power density in passive sections
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 enables effective on-board amplification of optical signals, ensuring desired signal strengths are maintained over longer distances on the PCB, allowing for diverse applications by varying amplification levels on a waveguide-by-waveguide basis, thus overcoming signal absorption issues without power consumption increases.
Implementation Method 1
The presence of lanthanides allows the active region to be optically pumped to generate a population inversion in its electron states
Implementation Method 2
an incoming signal photon interacts with the excited atom and the latter's excited electron falls to a lower energy state while emitting a photon with the same energy (wavelength) and phase and in the same direction as the original photon. This gives rise to an amplification of incoming optical signals
Data Source
AI summary
The invention provides an amplification module for an optical printed circuit board, the optical printed circuit board comprising plural polymer waveguide sections from independent waveguides, each of the sections being doped with an amplifying dopant, wherein the plural waveguide sections are routed so as to pass through an amplification zone in which the plural polymer waveguide sections are arranged close or adjacent to one another, the amplification module comprising: a pump source comprising plural light sources arranged to provide independently controllable levels of pump radiation to each of the plural waveguide sections. In an embodiment, the amplification module also includes plural polymer waveguide sections corresponding to the plural polymer waveguides of the printed circuit board on which in use the amplification module is to be arranged, each of the sections being doped with an amplifying dopant.