Variable Channel Spacing in Coherent Optical Transmission
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Solution Overview
Problem
Coherent transmission systems face limitations due to fixed channel spacing, leading to underutilization and reduced data transmission rates due to impairments in optical links, such as dispersion and asymmetries in optical fibers, which result in spectral gaps and reduced capacity.
Innovation Solution
A system with dynamically adjustable channel spacing, where carrier frequencies of individual signal channels can be controlled to maintain optimal spacing based on desired capacity, reach, and modulation format, using optical circuits and combiners to combine and adjust optical signals, allowing for continuous reconfiguration to maximize system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed channel spacing is employed to ensure adequate bandwidth for overcoming impairments, then transmission reliability is improved, but spectral gaps appear and system capacity is reduced
Solution Approach 1:
The patent implements dynamically adjustable channel spacing where the spacing between adjacent signal channels can be varied based on link conditions. The system transitions from fixed to variable spacing, allowing optimization between reliability and capacity by adjusting spacing according to actual impairment levels in the transmission medium.
Solution Approach 2:
The invention changes the parameter of channel spacing from a fixed value to a variable parameter that can be adjusted based on link quality. By modifying the spacing parameter dynamically, the system adapts to different transmission conditions, filling spectral gaps when possible while maintaining adequate separation when impairments require it.
2Productivity
If fixed channel spacing is reduced to maximize system capacity, then productivity is improved, but transmission reliability deteriorates due to insufficient bandwidth for impairments
Solution Approach 1:
The system employs dynamic channel spacing adjustment where spacing can be reduced in high-quality links to maximize capacity while maintaining reliability. The adaptive nature allows the system to optimize for productivity when link conditions permit, while automatically increasing spacing when impairments threaten transmission reliability.
Solution Approach 2:
The channel spacing parameter is made variable and adjustable based on link quality assessment. The system changes the spacing parameter from a conservative fixed value to an optimized variable value, enabling higher capacity deployment while maintaining reliability through condition-based adjustment.
3Productivity
If variable channel spacing is implemented to maximize capacity, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the system monitors link conditions and uses this information to adjust channel spacing dynamically. The feedback loop enables intelligent optimization of capacity while managing complexity through automated decision-making based on measured transmission quality parameters.
Solution Approach 2:
The system performs self-configuration and self-optimization of channel spacing based on monitored link conditions. By enabling the transmission system to automatically adjust its own parameters without external intervention, the patent reduces operational complexity while maximizing productivity through adaptive optimization.
Data Source
AI summary
The present disclosure provides a transmission system, apparatus and method to provide for variable channel spacing in multiplexed or combined optical signals for transmission over a network infrastructure. The channel spacing may be monitored and maintained at desired values in order to maximize the channel density under various conditions related to the network infrastructure. The individual carrier frequencies associated with each signal channel of the transmission system may be individually controlled to define the desired channel. The channel spacing may be altered to provide for higher channel densities increasing system capacity, or to provide for lower channel densities improving the overall reach of the transmission system. The channel spacing may be continuously monitored and maintained at desired values allowing for rapid and automated reconfiguration of the transmission system, which may result in maximized capacity and reduced costs.