Multimode Optical Signal Processing via Mode Conversion
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Solution Overview
Problem
Current mode-division multiplexing (MDM) systems face challenges in creating reconfigurable MDM-WDM networks due to the dissimilar spectral properties and confinements of individual spatial modes, limiting bandwidth expansion and flexibility in optical interconnects for datacenters and multi-processors.
Innovation Solution
The technique involves converting multimode optical signals into fundamental modes for processing, allowing for equal accessibility and use of single-mode rings for switching, which is compatible with WDM, enabling a 1×2 reconfigurable on-chip switch that routes multiple channels with low crosstalk and error-free performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multimode waveguides are used to carry multiple spatial modes for bandwidth expansion, then bandwidth capacity is improved, but individual modes have dissimilar spectral properties and confinements making reconfigurable routing difficult
Solution Approach 1:
The patent segments the multimode signal into multiple single-mode signals by converting each spatial mode into a separate single-mode signal. This segmentation allows independent processing and routing of each mode through dedicated single-mode waveguides, resolving the issue of dissimilar spectral properties preventing reconfigurable routing.
Solution Approach 2:
The patent introduces single-mode waveguides and single-mode ring resonators as intermediary components between the multimode waveguide and the routing functionality. These intermediaries provide a uniform interface for all spatial modes, enabling consistent spectral properties and confinements that facilitate reconfigurable routing while preserving the high bandwidth capacity of the original multimode system.
2Adaptability or versatility
If single-mode rings are used for switching, then WDM compatibility and individual channel control are achieved, but conversion from multimode to single-mode is required adding device complexity
Solution Approach 1:
The patent merges the mode conversion function with the switching function by integrating the single-mode ring resonators directly into the switching architecture. The same single-mode rings that perform wavelength-selective switching also serve as the conversion interface from multimode to single-mode, eliminating the need for separate conversion components and reducing overall device complexity.
3Quantity of substance
If multimode WDM is implemented directly, then bandwidth density is increased, but limitations in routing flexibility and channel accessibility persist
Solution Approach 1:
The patent transitions from direct multimode WDM operation to a hybrid approach where spatial modes are converted to wavelength-domain operations in single-mode waveguides. This dimensional change from spatial-mode multiplexing to wavelength multiplexing enables uniform channel accessibility and routing flexibility while preserving the high bandwidth density achieved through spatial mode utilization.
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 enables ultrahigh-bandwidth, reconfigurable on-chip MDM-WDM networks with low crosstalk and error-free switching, overcoming limitations in multimode WDM by using phase-matching between multimode and single-mode waveguides, achieving efficient signal processing and routing.
Implementation Method 1
The conversion to fundamental modes allows the use of single mode rings for switching, which avoids limitations in multimode WDM. Phase-matching between a multimode waveguide and sets of identical single-mode ring resonators enables the conversion between multimode and single-mode domains.
Data Source
AI summary
This patent document provides optical processing and switching of optical channels based on mode-division multiplexing (MDM) and wavelength division multiplexing (WDM). In one implementation, a method is provided for processing different optical signal channels to include receiving different input optical signal channels in different optical waveguide modes and in different wavelengths; converting input optical signal channels in multimodes into single-mode optical signal channels, respectively; subsequent to the conversion, processing single-mode optical signal channels obtained from the different input optical signal channels to re-group single-mode optical signal channels into different groups of processed single-mode optical signal channels; and converting different groups of the processed single-mode optical signal channels into different groups of output optical signal channels containing one or more optical signal channels in multimodes multimode signals to direct the groups as different optical outputs.