Bypass/backup-link switchable coherent point-to-multipoint configured WDM-PON system with shared protection

Area of Science:

• Optical Networking
• Telecommunications Engineering
• Network Resilience

Background:

• Edge computing demands robust network infrastructure for applications like 5G, IoT, and AI.
• Existing point-to-multipoint networks lack inherent disaster resistance and flexible link management.

Purpose of the Study:

• To develop a disaster-resistant network configuration for optical access networks.
• To enable flexible switching between link-occupancy and link-sharing network orientations.
• To enhance reliability for critical edge computing applications.

Main Methods:

• Introduced a shared link orientation connecting distributed optical terminals to a centralized optical terminal.
• Proposed a method for switching network configurations at the optical switch aggregation station.
• Conducted verification experiments demonstrating wavelength conversion and optical path switching during link failure.

Main Results:

• Achieved < 2 dB penalty with minimal back reflection during secondary link transmissions post-primary link failure.
• Confirmed wavelength collision-free transmissions.
• Demonstrated the ability to switch between link-occupancy and link-sharing network configurations.

Conclusions:

• The proposed method offers a novel, disaster-resistant network configuration for wavelength division multiplexing-based coherent passive optical network systems.
• This facilitates the development of more resilient and adaptable optical networks for future applications.
• The system allows centralized optical terminals to easily transition between different network link orientations.