Optical Transmission System Filter Boundary Detection
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Solution Overview
Problem
In optical transmission systems with OADM branching devices, detecting the filter boundary is challenging when the proportion of dummy light wavelengths exceeds that of main signal wavelengths, making it difficult to monitor the system's state and wavelength arrangement.
Innovation Solution
The system employs a terminal station device that transmits wavelength multiplexed optical signals with dummy light having distinct wavelength arrangements, allowing the optical add-drop multiplexer to perform add-drop processing and enable detection of the filter boundary through a light spectrum monitor and monitoring unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dummy light is arranged in remaining wavelength bands to fill unused capacity, then wavelength utilization efficiency is improved, but filter boundary detection becomes difficult
Solution Approach 1:
The patent introduces a light spectrum monitor as an intermediary device that measures the spectrum of optical signals. By analyzing the measured spectrum data, the system can detect filter boundaries even in the presence of dummy light, thus resolving the contradiction between high wavelength utilization and detectability
Solution Approach 2:
The system implements feedback by continuously monitoring the optical signal spectrum and using this information to identify filter boundaries. The light spectrum monitor provides real-time feedback about the spectral composition, enabling the system to adapt and correctly identify boundaries despite the presence of dummy light filling wavelength bands
Data Source
AI summary
An optical transmission system includes: a terminal station device that transmits a wavelength multiplexed optical signal resulting from multiplexing an optical signal and dummy light; and an optical add-drop multiplexer that receives respective wavelength multiplexed optical signals transmitted from a plurality of the terminal station devices and performs add-drop processing on the wavelength multiplexed optical signals. The dummy light has a wavelength arrangement in which adjacent wavelengths are arranged with equal spacing, and the wavelength arrangement of the dummy light differs between the terminal station devices.