Optical Transmitter-Receiver Loopback for Performance Degradation Detection
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Solution Overview
Problem
The reliability of optical communication transmission systems deteriorates due to performance degradation caused by chronological changes in components and inconsistencies in their coordinated actions, making it difficult to detect and prevent these issues after the system has started operating.
Innovation Solution
An optical communication transmission system with a redundant structure, including a loopback device and performance check scheduling, allows for regular detection of performance degradations by switching between active and standby transmitter-receivers and conducting performance checks during operation, using signal light to assess the transmitter-receiver components and compensate for wavelength and polarization dispersions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the signal speed is increased to improve transmission capacity, then the transmission capability is improved, but the receiving sensitivity deteriorates and the system becomes more complex
Solution Approach 1:
The patent employs dynamic modulation-demodulation methods that adapt to different signal speeds. For speeds up to 10 Gb/s, simple IM/DD is used, while for 40 Gb/s and above, more sophisticated modulation schemes with dynamic phase and amplitude control are implemented to maintain receiving sensitivity despite increased transmission capacity requirements.
Solution Approach 2:
The system changes key parameters including modulation format, detection method, and compensation techniques based on signal speed. At higher speeds, the system transitions from direct detection to coherent detection and implements dynamic dispersion compensation to maintain performance while increasing capacity.
2Productivity
If the signal speed is increased without improving transmission path capacity, then the transmission efficiency is improved, but signal quality degradation becomes more prominent
Solution Approach 1:
The patent converts harmful signal quality degradations into manageable parameters by implementing specific compensation techniques. Wavelength dispersion and polarization mode dispersion, which cause signal degradation at high speeds, are compensated using dedicated compensators and adaptive equalization, transforming these harmful effects into correctable distortions.
Solution Approach 2:
The system introduces intermediary components including dispersion compensators, polarization controllers, and forward error correction codes that act as mediators between the transmitted and received signals, mitigating the effects of signal quality degradation while maintaining high transmission efficiency.
3Reliability
If compensation for wavelength and polarization dispersions is implemented, then the signal quality is improved, but the device complexity increases
Solution Approach 1:
The patent segments the compensation function into separate modular components: wavelength dispersion compensators, polarization mode dispersion compensators, and digital signal processing units. This segmentation allows each component to be optimized independently and facilitates maintenance and adjustment without affecting the entire system.
Solution Approach 2:
The system employs universal compensators and control mechanisms that can handle multiple types of dispersion simultaneously. The adaptive equalization and digital signal processing units provide multi-functional compensation for various impairment types, reducing the need for separate dedicated compensators for each distortion type.
4Productivity
If the number of components is increased to achieve higher signal speed, then the transmission capability is improved, but the system reliability deteriorates
Solution Approach 1:
The patent implements comprehensive feedback mechanisms including performance monitoring units, error detection systems, and adaptive control loops that continuously monitor system health and adjust operating parameters. This feedback enables early detection of component degradation and maintains system reliability despite the increased number of components required for high-speed operation.
Solution Approach 2:
The system incorporates forward error correction codes, redundancy in critical components, and preventive maintenance scheduling that cushion against component failures. These measures are built in beforehand to compensate for the increased failure probability associated with having more components at higher signal speeds.
Data Source
AI summary
To detect the performance degradation of an optical communication transmission system after it becoming operational, thereby preventing the reliability of the system from lowering. In an optical communication transmission system, one of optical transmitter-receivers in a redundant-structured system is an active optical transmitter-receiver, and the other optical transmitter-receiver is a standby optical transmitter-receiver. The optical transmitter-receiver includes a loopback device through which the signal light of a transmitting section of the optical transmitter-receivers is inputted to a receiving section, and an operating-system switching scheduling device for regularly switching the operating system is provided. Further, there is also provided a performance check scheduling device which operates the loopback device of the standby-system optical transmitter-receiver at a prescribed timing determined in advance to start the performance check processing by the transmitting section and the receiving section of the optical transmitter-receiver.