Sub-band Chromatic Dispersion Equalizer for Low-Power Transceivers
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Solution Overview
Problem
Existing chromatic dispersion compensation techniques in optical networking are inefficient for small-scale, low-power environments, such as pluggable optical transceivers, due to the large-sized FFT and IFFT components required, which lead to circuit size, leakage, and power consumption issues.
Innovation Solution
The implementation of a sub-band chromatic dispersion equalizer engine (CDEQ) with smaller FFT and IFFT sizes, utilizing a sub-band processing approach with overlapping sub-bands and programmable Dm/Hm multipliers, to achieve comparable chromatic dispersion equalization with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-sized FFT and IFFT components are used for chromatic dispersion compensation, then chromatic dispersion equalization effectiveness is improved, but circuit size, leakage, and power consumption increase
Solution Approach 1:
The patent divides the frequency spectrum into multiple sub-bands and processes each sub-band separately with smaller FFT/IFFT components. This segmentation allows the system to achieve comprehensive chromatic dispersion compensation across the entire spectrum while using smaller, lower-power processing components for each individual sub-band.
Solution Approach 2:
The patent transitions from processing the entire frequency spectrum in a single dimension (one large FFT/IFFT) to processing multiple sub-bands in parallel across an additional dimension (multiple smaller FFT/IFFT operations). This dimensional change enables reduced computational complexity and power consumption while maintaining overall equalization effectiveness.
2Reliability
If large-sized FFT and IFFT components are used for chromatic dispersion compensation, then chromatic dispersion equalization effectiveness is improved, but circuit size increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, allowing each sub-band to be processed by smaller FFT/IFFT components. This segmentation reduces the size of individual processing circuits while collectively covering the entire frequency range needed for effective chromatic dispersion compensation.
Solution Approach 2:
By introducing the sub-band dimension, the patent enables parallel processing architecture that reduces the area of individual circuit components. Multiple smaller circuits operating in parallel occupy less total area than a single large circuit would require.
3Reliability
If large-sized FFT and IFFT components are used for chromatic dispersion compensation, then chromatic dispersion equalization effectiveness is improved, but leakage increases
Solution Approach 1:
The patent segments the broad frequency spectrum into narrower sub-bands, which reduces spectral leakage effects within each sub-band processing operation. Smaller FFT/IFFT sizes result in reduced leakage artifacts, and the overlapping sub-band structure ensures comprehensive coverage without the leakage problems of large single-band processing.
Data Source
AI summary
The present invention provides new apparatus and methods for chromatic dispersion compensation.