Binary Encoding for Controlled Bit Probabilities in Optical Links
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Solution Overview
Problem
Current optical transmission systems face challenges in reducing noise and error rates due to high power consumption and expensive components, particularly in non-coherent systems, which limit their capacity and efficiency compared to coherent systems.
Innovation Solution
A binary encoding and decoding method that adjusts binary digit prevalence by computing multiple variations of a binary signal, combining them with different redundancy sequences, and selecting the optimal sequence based on digit transitions or prevalence to reduce error rates, which can be transmitted through dispersion compensation fibers or using IQ modulators for chromatic dispersion pre-compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If non-coherent systems use cheaper components and simpler DSP, then cost and power consumption are reduced, but capacity and transmission distance are limited
Solution Approach 1:
The patent changes the parameter of binary digit prevalence in the data stream by selectively mapping binary sequences with different numbers of transitions to different modulation symbols. This parameter change optimizes the signal characteristics to reduce intersymbol interference and improve reception accuracy, enabling non-coherent systems to achieve better performance without increasing power consumption or component complexity
2Reliability
If non-coherent systems use dispersion compensating fibers, then chromatic dispersion is compensated, but system complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-compensating for chromatic dispersion effects through selective mapping of binary sequences before transmission. By controlling the number of transitions in the transmitted signal based on the characteristics of the transmission medium, the system pre-adjusts the signal to counteract dispersion effects, eliminating the need for complex dispersion compensating fibers or post-reception equalization
3Speed
If binary sequences with high digit transitions are transmitted, then data rate is maintained, but error rates increase due to intersymbol interference
Solution Approach 1:
The patent dynamically changes the parameter of transition count in binary sequences based on channel conditions and position in the data stream. By selectively mapping sequences with different numbers of transitions to different modulation symbols, the system maintains high data rates while reducing intersymbol interference and improving reception accuracy, thus lowering bit error rates without sacrificing speed
Data Source
AI summary
A binary encoder includes an input configured to receive a binary signal, an encoding processor configured to compute a plurality of different variations of the binary signal, combine each of the different variations with a different redundancy sequence to create a plurality of optional output binary sequences, and select one of the optional output binary sequences according to a binary digit prevalence, and an output configured to output the selected binary sequence. A decoder configured to identify a redundancy sequence of a received binary signal to select a transformation function according to the redundancy sequence and to convert the binary signal according to the transformation function.