Optical Link Auto-Negotiation Channel for WDM Networks
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Solution Overview
Problem
The existing methods for link establishment in wavelength-division multiplexing (WDM) optical access networks, particularly in 5G fronthaul, face challenges such as long link establishment processes and crosstalk due to the use of tunable optical modules, which increase complexity and cost, and deteriorate signal quality due to the need for auxiliary management channels implemented through pilot tone modulation.
Innovation Solution
A method for link establishment that uses an independent optical link auto-negotiation channel to exchange information about operating wavelengths, forward error correction states, and auxiliary management channel modes without increasing the complexity or cost of the optical module, allowing for simultaneous establishment of traffic data and auxiliary management channels without affecting signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tunable optical module is used for scanning wavelengths one by one to establish a link, then the link establishment process can be completed, but the link establishment time becomes very long and crosstalk is generated with other operating wavelength channels
Solution Approach 1:
The patent applies preliminary action by pre-defining a mapping relationship between wavelength channels and auxiliary management channel resource blocks before actual link establishment. This pre-configuration allows the system to directly allocate resources without scanning, significantly reducing link establishment time while avoiding crosstalk through predetermined channel separation.
2Loss of information
If an auxiliary management channel (HTMC) is implemented by pilot tone modulation technology, then wavelength information can be carried, but the complexity and cost of the optical module increases
Solution Approach 1:
The patent extracts the wavelength information carrying function from the main data transmission channel by dedicating specific resource blocks in the auxiliary management channel. This separation allows wavelength information to be transmitted independently without requiring complex pilot tone modulation in the main optical module, thereby reducing overall system complexity.
Solution Approach 2:
The auxiliary management channel resource blocks serve multiple functions: they carry both wavelength information and general management data. This multi-functionality eliminates the need for separate dedicated channels for different management purposes, reducing optical module complexity while maintaining comprehensive information transmission capability.
3Loss of information
If an auxiliary management channel is implemented by pilot tone modulation technology, then wavelength information can be carried, but the signal quality of the optical link deteriorates
Solution Approach 1:
The patent extracts wavelength information transmission from the main data channel and places it in dedicated auxiliary management channel resource blocks. This extraction prevents pilot tone modulation from interfering with the main optical link signal, thereby maintaining signal quality while still enabling wavelength information transmission.
4Loss of information
If an auxiliary management channel is implemented by pilot tone modulation technology, then wavelength information can be carried, but optical power cost increases
Solution Approach 1:
The auxiliary management channel resource blocks are designed to carry multiple types of information (wavelength information, management data, control signals) simultaneously. This multi-functionality eliminates the need for separate dedicated channels for each function, reducing overall optical power consumption by avoiding redundant transmission infrastructure.
Data Source
AI summary
Provided are a link establishment method and apparatus and a computer-readable storage medium. The link establishment method includes: exchanging optical link auto-negotiation information with a terminal device through an optical link auto-negotiation channel; and in a case where exchanging the optical link auto-negotiation information is finished, establishing at least one of a traffic data channel or an optical link auto-negotiation channel; where the optical link auto-negotiation channel is independent of the traffic data channel or the optical link auto-negotiation channel; and the optical link auto-negotiation information includes at least one of information about an operating wavelength channel of the terminal device, an enabled or disabled state of forward error correction with the terminal device, a forward error correction type with the terminal device, or an operating mode of the auxiliary management channel.