Upstream WDM-PON transmission scheme based on PDM-OOK modulation and digital coherent detection with dual-modulus...

Area of Science:

• Telecommunications Engineering
• Optical Networking
• Signal Processing

Background:

• Wavelength-division-multiplexing passive optical network (WDM-PON) offers significant bandwidth, protocol transparency, and scalability for next-generation access networks.
• Existing WDM-PON architectures face challenges in cost-effective upstream capacity enhancement and receiver performance.

Purpose of the Study:

• To propose and demonstrate a cost-effective, high-speed upstream WDM-PON scheme.
• To improve upstream capacity and receiver sensitivity at the optical line terminal (OLT).

Main Methods:

• Adoption of polarization division multiplexed (PDM) on-off keying (OOK) modulation at the optical network unit (ONU).
• Implementation of digital coherent/self-coherent detection with a novel blind dual-modulus equalization algorithm at the OLT.
• Experimental demonstration of 40-Gb/s upstream transmission over an 80-km WDM-PON link.

Main Results:

• Achieved 40-Gb/s upstream transmission capacity.
• Demonstrated enhanced receiver sensitivity and improved power budget.
• Validated the cost-effectiveness of the proposed scheme for the ONU.

Conclusions:

• The proposed PDM-OOK modulation and advanced digital signal processing provide a viable solution for high-speed upstream WDM-PON.
• This approach significantly enhances upstream capacity and network performance while maintaining low ONU expenditure.
• The experimental results confirm the potential of this scheme for future optical access networks.