Remote Optical Fiber Dispersion Compensation via Distance Measurement
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Solution Overview
Problem
In optical fiber access networks, the varying remote distances of different wavelength channels make it challenging to meet residual dispersion requirements, as existing methods require additional devices and manual operations for dispersion compensation, and cannot effectively equalize dispersion differences across channels.
Innovation Solution
A remote optical fiber dispersion compensation method and device that includes a distance measurement module, channel monitoring module, and a remote optical fiber dispersion power equalization module with a wavelength selection switch and dispersion compensation optical fibers of different lengths, which measures and adjusts for remote distances and spectral powers to perform dispersion compensation and insertion loss adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual dispersion compensation is performed for each wavelength channel's remote distance, then dispersion requirements can be met, but device complexity increases due to requiring a large number of dispersion compensation modules
Solution Approach 1:
The patent segments the wavelength channels into different groups based on their remote distances, with each group assigned to a specific dispersion compensation module. This allows one module to serve multiple channels within its distance range, reducing the total number of modules needed while still providing appropriate dispersion compensation for each channel group.
Solution Approach 2:
Each dispersion compensation module is designed to handle multiple wavelength channels within a specific remote distance range, making the module universal for that group of channels. This multi-functionality reduces the overall number of modules required in the system.
2Reliability
If individual dispersion compensation is performed for each wavelength channel, then dispersion requirements can be met, but operational complexity increases due to additional manual operations
Solution Approach 1:
The system automatically measures the remote distance for each wavelength channel and autonomously assigns channels to appropriate dispersion compensation modules based on measured distances. This self-service mechanism eliminates the need for manual configuration and operation, reducing operational complexity while ensuring dispersion requirements are met.
Solution Approach 2:
The system incorporates remote distance measurement and channel monitoring that provides feedback to the dispersion compensation control. This feedback loop enables automatic adjustment and assignment of channels to modules based on actual measured conditions, eliminating manual operations.
3Adaptability or versatility
If photoelectric light mode is adopted for remote service, then service conversion can be performed, but additional devices and management are required
Solution Approach 1:
The patent combines the remote service optical signal processing with the local optical transceiver module functions. By merging these functions and utilizing the existing local optical module, the system avoids requiring separate photoelectric conversion devices, thereby reducing device complexity while maintaining service conversion capability.
Data Source
AI summary
Provided by the embodiments of the present invention are a remote optical fiber dispersion compensation device and method, the dispersion compensation device comprising: a distance measurement module, used for measuring a remote distance to a remote access optical fiber; a channel monitoring module, used for monitoring the spectral power of a transmission service wavelength channel; and a remote optical fiber dispersion power equalization module, used for compensating the dispersion of a transmission service signal and adjusting the insertion loss of the wavelength channel according to the measured remote distance of the remote access optical fiber and the monitored spectral power of the transmission service wavelength channel. By employing the embodiments of the present invention, compensation amounts of different channels may be flexibly selected by means of a wavelength selection switch, dispersion may be compensated for remote optical fiber transmission and the insertion loss may be adjusted for different channels by presetting dispersion compensation optical fibers of different lengths, thus achieving compensation and equalization of dispersion and power difference introduced by remote optical fibers of different lengths.