Arrayed Waveguide Grating for Multi-Band Optical Multiplexing
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Solution Overview
Problem
Current optical network architectures face challenges in efficiently multiplexing and de-multiplexing multiple wavelength bands, leading to complex and costly network structures, particularly at user interfaces in passive optical networks.
Innovation Solution
The implementation of an arrayed waveguide grating (AWG) with a planar substrate and coupling waveguides that optically connect to a plurality of dispersed waveguides, enabling simultaneous multiplexing and de-multiplexing of distinct optical bands, thereby simplifying network architecture and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical network architectures use separate multiplexing and de-multiplexing components for each wavelength band, then reliable signal transmission is achieved, but device complexity and network cost increase significantly
Solution Approach 1:
The patent combines multiple multiplexing and de-multiplexing functions into a single integrated AWG device. The arrayed waveguide grating structure performs both multiplexing of incoming wavelength bands and de-multiplexing of outgoing wavelength bands simultaneously, eliminating the need for separate biplexer components at each network interface. This merging reduces device complexity while maintaining signal transmission reliability through the inherent wavelength-selective routing capability of the AWG structure.
Solution Approach 2:
The AWG device serves multiple functions within a single component: it multiplexes multiple wavelength bands onto a common line, de-multiplexes incoming bands from the common line, and routes specific wavelengths to appropriate output ports. This multi-functionality replaces what would traditionally require multiple separate components, thereby reducing overall network complexity and cost while preserving reliable transmission through proven optical routing mechanisms.
2Reliability
If multiple biplexers are deployed at user interfaces to handle different wavelength bands, then complete band separation is achieved, but network cost and structural complexity increase
Solution Approach 1:
The patent merges the functions of multiple biplexers into a single AWG device at the network interface. The arrayed waveguide grating simultaneously handles separation of multiple wavelength bands (C-band, L-band, etc.) and routing to different output ports, replacing what would traditionally require multiple separate biplexer units. This consolidation maintains complete band separation while dramatically reducing network structural complexity and associated costs.
Solution Approach 2:
The AWG device internally segments different wavelength bands through its arrayed waveguide structure, directing each wavelength to a specific output port based on its diffraction angle. This internal segmentation achieves complete band separation without requiring external biplexer components, thereby reducing network complexity while maintaining the reliability of wavelength-specific routing.
3Measurement precision
If conventional D/MUX structures are used for each wavelength band, then precise wavelength routing is achieved, but the number of required components and interfaces increases
Solution Approach 1:
The patent combines multiple D/MUX functions for different wavelength bands into a single AWG device. The arrayed waveguide grating simultaneously performs precise wavelength routing for multiple bands (C-band, L-band, and others) through its inherent diffraction-based wavelength separation mechanism, eliminating the need for multiple separate D/MUX components and their associated interfaces. This merging maintains wavelength routing precision while reducing the total number of components.
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 allows for efficient separation and combination of optical signals across multiple bands, reducing the need for multiple biplexers and enhancing network flexibility, resulting in a more accessible and cost-effective optical communication system with improved user interfaces.
Implementation Method 1
The length differences of the dispersive waveguide array are selected to result in appropriate constructive and destructive interference between light transmitted by the array of waveguides such that a multi-chromatic signal is spatially spread out by the interference pattern
Implementation Method 2
Arrayed waveguide gratings (AWG) are planar optical circuit components that are designed to perform multiplexing and de-multiplexing functions for optical signals
Data Source
AI summary
Optical networks can comprise a branch structure with the de-multiplexing/multiplexing structure that operates to disperse a plurality of optical bands. Thus, the optical network comprises an optical network connection with a common optical channel, a plurality of de-multiplexed branch optical service connections and the de-multiplexing/multiplexing structure. In some embodiments, one optical band can be used to deliver input from a common channel to the branch node and the other optical band can carry output along the common channel from the branch node. The de-multiplexing/multiplexing element can be an arrayed waveguide grating. The AWG can have desirable architecture to efficiently provide the corresponding functions with respect to the two optical bands. Appropriate photodetectors and light sources can be associated with the AWG.