Flexible Grid TWDM-PON Architecture for Automatic Channel Alignment
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Solution Overview
Problem
Current PON systems face challenges with cost, complexity, and lack of automatic channel alignment and set-up for downstream and upstream channels, especially as network topology changes and new devices are added.
Innovation Solution
A flexible grid TWDM-PON architecture is introduced, featuring an optical transmitter array, optical combiner, optical amplifier, WDM filter, and tunable optical network units, which allow for online receiver characterization and channel matching, enabling flexible and intelligent management of downstream and upstream channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wavelength division multiplexers are used to combine optical signals into a fiber for transmission, then multi-wavelength transmission capability is achieved, but cost and complexity increase significantly when new devices are added or network topology changes
Solution Approach 1:
The patent implements dynamic channel allocation and assignment in TWDM-PON systems, allowing the network to adapt to topology changes and new device additions without requiring complex wavelength division multiplexers. The system dynamically adjusts wavelength assignments and time slots based on current network conditions, replacing static WDM infrastructure with flexible electronic control mechanisms.
Solution Approach 2:
The system changes operational parameters (wavelength assignments, time slots, channel configurations) through software control rather than physical hardware reconfiguration. This allows the network to adapt to topology changes by modifying configuration parameters rather than installing new wavelength division multiplexers, significantly reducing complexity.
2Extent of automation
If wavelength division multiplexers are used for combining optical signals, then multi-wavelength transmission is enabled, but automatic channel alignment and channel set-up are not provided
Solution Approach 1:
The patent implements self-service mechanisms where the TWDM-PON system automatically performs channel alignment, wavelength assignment, and setup procedures without manual intervention. The system includes automated discovery protocols that detect new devices, automatically assign wavelengths and time slots, and configure channels based on current network state, eliminating the need for complex manual setup procedures.
Solution Approach 2:
The system incorporates feedback mechanisms where the network continuously monitors channel conditions, device status, and wavelength assignments. Based on this feedback, the system automatically adjusts and realigns channels, ensuring optimal performance without manual intervention. The feedback loop enables automatic correction of misalignments and dynamic reconfiguration when needed.
3Ease of operation
If traditional PON architecture is used, then basic optical signal transmission is achieved, but flexibility and manageability decrease when network changes occur
Solution Approach 1:
The patent implements a universal control mechanism in TWDM-PON that handles multiple functions through a single intelligent platform. The system can perform wavelength assignment, time slot allocation, channel configuration, and topology management through centralized electronic control, replacing multiple specialized hardware components with a multi-functional software-based management system that simplifies operation and enhances flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution results in a more cost-effective, flexible, and manageable PON system that automatically aligns and sets up channels, reducing costs and enhancing system reliability and flexibility.
Implementation Method 1
an optical amplifier coupled to the optical combiner configured to boost downstream optical power
Implementation Method 2
a WDM filter coupled to the optical amplifier configured to separate or combine downstream and upstream optical signals
Data Source
AI summary
An approach to proving a flexible grid architecture for time and wavelength division multiplexed passive optical networks is described. One embodiment includes an optical transmitter array configured to transmit an optical signal, an optical combiner coupled to the optical transmitter array configured to receive unlocked wavelengths from the optical transmitter array and output a single optical signal, and an optical amplifier coupled to the optical combiner configured to boost downstream optical power. In some embodiments, a WDM filter is coupled to the optical amplifier, and a tunable optical network unit (ONU) coupled to the WDM filter is configured to transmit and receive the optical signals. In still other embodiments, a cyclic demultiplexer is coupled to the optical splitter and connects to an optical receiver array configured to receive optical signals.