Optical Network Device Data Rate Dispersion for EMI Reduction
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Solution Overview
Problem
High port density and high data rate in optical network devices lead to excessive electromagnetic interference, making it challenging to pass electromagnetic compatibility (EMC)/electromagnetic interference (EMI) tests, as existing techniques such as absorbers and shielding improvements become inadequate with increasing speeds and densities.
Innovation Solution
The system disperses data rates by inserting idle data blocks into data streams, converting each transmit signal into optical signals with offset data rates, and using a phase lock loop configuration to maintain compatibility with current systems while reducing EMI, ensuring compliance with regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high port density and high data rate are implemented, then data transmission capacity is improved, but electromagnetic interference exceeds acceptable levels
Solution Approach 1:
The patent segments the data transmission by dividing channels into different groups, where each group operates at a different data rate. This segmentation causes the electromagnetic radiation from different channels to be distributed across different frequency ranges, reducing the aggregate EMI at any single frequency point while maintaining high overall data transmission capacity
Solution Approach 2:
The patent changes the data rate parameter across different channel groups to create frequency offset. By assigning different data rates (e.g., 25.78125 Gbps, 25.78225 Gbps, 25.78325 Gbps) to different channel groups, the system transforms the EMI problem into a frequency distribution problem, where radiation is spread across different frequency points rather than concentrated at a single frequency
2Object-generated harmful factors
If traditional EMI mitigation techniques such as absorbers and shielding are applied, then electromagnetic interference is reduced, but the solution becomes inadequate with increasing speeds and densities
Solution Approach 1:
The patent replaces physical EMI mitigation techniques (absorbers and shielding) with a signal processing approach. Instead of using physical barriers or absorptive materials, the system uses data rate dispersion and frequency offsetting to fundamentally change how EMI is managed, transforming it from a physical problem to a signal processing problem that can be solved through software/firmware control
Data Source
AI summary
A method in which a plurality of transmit signals are generated at data rates that are offset from each other by inserting an idle data block into a data stream for one or more transmit signals of the plurality of transmit signals to increase a data rate for the one or more transmit signals, thereby minimizing detectable electromagnetic interference at a particular frequency. The method further includes converting each transmit signal of the plurality of transmit signals to a corresponding optical transmit signal of a plurality of optical transmit signals for transmission via a corresponding channel of a plurality of channels of an optical network device and transmitting the plurality of optical transmit signals via respective ones of the plurality of channels for transmission on respective optical fibers.