Optical Network Unit Wavelength Self-Configuration
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Solution Overview
Problem
Current optical access networks require manual configuration of wavelengths for ONUs, leading to complex management and potential malfunctions, especially when accommodating multiple optical access methods and services, which increases costs and maintenance burdens.
Innovation Solution
A network system where each ONU autonomously sets its wavelength based on received downstream signal properties, eliminating the need for a control channel and reducing manual configuration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual configuration of wavelengths for ONUs is performed, then wavelength assignment can be controlled, but device complexity and management difficulty increase
Solution Approach 1:
The ONU autonomously determines its operating wavelength by detecting the downstream signal wavelength from the OLT without requiring manual configuration. The ONU's wavelength determination unit automatically identifies the wavelength based on the received optical signal, enabling self-configuration and eliminating the need for manual wavelength assignment, thereby reducing management complexity while maintaining operational ease.
2Adaptability or versatility
If multiple optical access methods are accommodated with fixed wavelength associations, then service diversity is achieved, but adaptability decreases when configuration changes are needed
Solution Approach 1:
The system dynamically assigns wavelengths to ONUs based on the actual downstream signal wavelength detected by each ONU, rather than using fixed wavelength-to-service mappings. The ONU's wavelength determination unit automatically adapts to the OLT's downstream wavelength, allowing flexible reconfiguration of wavelength-service associations without changing ONU hardware or requiring manual reconfiguration, thereby enhancing adaptability while reducing configuration complexity.
3Measurement precision
If control channel is added for wavelength management, then wavelength control precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the wavelength control function from a separate control channel and integrates it into the existing downstream signal. The ONU detects the wavelength of the downstream signal directly without requiring additional control channels or frequency tones. This eliminates the need for separate control circuitry at both OLT and ONU, achieving precise wavelength control through the existing optical signal while reducing overall device complexity.
Data Source
AI summary
Provided is a network system including a subscriber apparatus and a station-side apparatus connected with the subscriber apparatus via an optical line. The subscriber apparatus includes a transceiver for receiving an instruction to change wavelengths for signals to be sent and received, receiving a downstream signal sent from the station-side apparatus and having a wavelength designated by the instruction, and sending an upstream signal having a wavelength designated by the instruction to the station-side apparatus. The subscriber apparatus includes a controller for identifying at least one property of the received downstream signal and determining wavelengths for signals to be sent and received based on the identified at least one property.