Cyclic Demultiplexer Grating Mirror Array PON2
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Solution Overview
Problem
Current cyclic demultiplexers for PON systems face challenges with high cost, significant insertion loss, and limited bandwidth, particularly in achieving scalable and efficient wavelength division multiplexing for next-generation PON2 standards.
Innovation Solution
A grating-based cyclic demultiplexer with a mirror array is introduced, where the grating divides input signals into individual wavelengths, and a beam steering engine redirects them to output ports, utilizing a cyclic mirror array configuration to achieve low-cost, low-loss, and wide-bandwidth performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cascade of 1×2 inter-leavers is used to implement cyclic demultiplexer, then cyclic demultiplexing function is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the cyclic demultiplexing function into two independent modules: a demultiplexer that separates wavelengths and a mirror array that performs cyclic routing. This segmentation replaces the complex cascade of inter-leavers with simpler, dedicated components that together achieve the same cyclic demultiplexing function with reduced overall complexity
Solution Approach 2:
The patent introduces a mirror array as an intermediary component between the demultiplexer and output ports. This mirror array acts as a mediator that performs the cyclic routing function, allowing the demultiplexer itself to remain simple while achieving complex cyclic demultiplexing behavior through the intermediary's routing actions
2Ease of manufacture
If arrayed waveguide grating is used for cyclic demultiplexer, then monolithic integration is achieved, but insertion loss increases and bandwidth decreases
Solution Approach 1:
The patent merges the demultiplexing function and cyclic routing function into a single integrated system where the demultiplexer and mirror array work together. This combination achieves the benefits of both approaches: the demultiplexer provides efficient wavelength separation with low loss, while the mirror array provides flexible cyclic routing, together achieving low insertion loss and wide bandwidth
3Ease of manufacture
If arrayed waveguide grating is used for cyclic demultiplexer, then monolithic integration is achieved, but passband width becomes narrow
Solution Approach 1:
The patent segments the overall function into wavelength demultiplexing and cyclic routing, allowing each component to be optimized independently. The demultiplexer handles wavelength separation with wide passband characteristics, while the mirror array handles cyclic routing, together achieving both monolithic integration and wide passband width
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 provides a cost-effective, low-insertion-loss, and scalable cyclic demultiplexer with a wide passband, enabling efficient wavelength management suitable for next-generation PON2 standards by using a grating and mirror array configuration.
Implementation Method 1
A grating receives the input signal from the input optical link and generates individual optical wavelength signals
Implementation Method 2
A mirror array operative as a beam steering engine receives the individual optical wavelength signals and redirects them to the grating
Data Source
AI summary
A demultiplexer includes an input optical link to receive an input signal. A grating receives the input signal from the input optical link and generates individual optical wavelength signals. A mirror array operative as a beam steering engine receives the individual optical wavelength signals and redirects them to the grating. Output optical links receive the individual optical wavelength signals from the grating.