Optical Multiplexer Timing Synchronization for Cross-Talk Reduction
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Solution Overview
Problem
Conventional optical transmission systems face challenges in suppressing cross-talk between densely arranged optical signals due to timing deviations caused by wavelength dispersion, making it difficult to effectively multiplex optical signals in frequency intervals.
Innovation Solution
The optical transmission system employs a series of multiplexers with monitoring and adjusting units to synchronize the timing of optical signals, using a multiplexing unit to combine signal light with adjacent frequency signals, a monitoring unit to detect timing deviations, and an adjusting unit to correct these deviations, thereby reducing cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical signals are densely arranged in frequency intervals to increase transmission capacity, then productivity is improved, but timing deviations due to wavelength dispersion cause cross-talk between signals worsening reliability
Solution Approach 1:
The patent changes the timing parameter of optical signals dynamically. Each multiplexer adjusts the timing of multiplexed optical signals based on monitoring results to compensate for wavelength dispersion effects, thereby maintaining signal integrity while enabling dense frequency arrangement
Solution Approach 2:
The patent implements a feedback mechanism where monitoring units detect timing deviations between optical signals, and this information is fed back to adjusting units that correct the timing. This closed-loop control ensures reliable signal transmission despite dense frequency spacing
2Measurement precision
If monitoring units use wide-band monitoring to accurately detect timing deviations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the monitoring function into individual monitoring units associated with each multiplexer stage. Each monitoring unit focuses on detecting timing deviations for specific signal pairs, breaking down the complex wide-band monitoring task into simpler, localized measurements that collectively achieve accurate timing deviation detection
Data Source
AI summary
An optical transmission system includes multiple multiplexers connected in series and each multiplexing an optical signal and given signal light. Each of the multiplexers includes a multiplexing unit that multiplexes the given signal light that is subject to multiplexing and a second optical signal of a frequency that is adjacent to the frequency of a first optical signal that is included in the given signal light; a monitoring unit that monitors deviation between timings of the first optical signal that is included in the signal light multiplexed with the second optical signal by the multiplexing unit, and the second optical signal; and an adjusting unit that based on a result of monitoring by the monitoring unit, adjusts the timing of the second optical signal that is to be multiplexed with the given signal light, by the multiplexing unit.