Energy efficient IM-DD OFDM-PON using dynamic SNR management and adaptive modulation

Area of Science:

• Optical Networking
• Digital Signal Processing
• Energy Efficiency

Background:

• Passive optical networks (PONs) are crucial for broadband access.
• Energy consumption in PONs, particularly in digital signal processors (DSPs), is a growing concern.
• Optimizing energy usage without compromising network performance is essential.

Purpose of the Study:

• To demonstrate an energy-efficient orthogonal frequency division multiplexing passive optical network (OFDM-PON).
• To investigate the impact of dynamic signal-to-noise ratio (SNR) management and adaptive modulation on energy consumption.
• To optimize calculation precision and modulation format for reduced energy usage.

Main Methods:

• Implemented dynamic SNR management and adaptive modulation techniques.
• Controlled calculation precision and modulation format of the digital signal processor.
• Experimentally validated the approach using an FPGA-based receiver.

Main Results:

• Achieved significant energy savings in the digital signal processor.
• Demonstrated that calculation precision and modulation format can be optimized based on optical received power.
• Realized a 58.7% effective energy efficiency per bit.

Conclusions:

• Dynamic SNR management and adaptive modulation are effective for energy-efficient OFDM-PONs.
• Optimizing digital signal processor parameters based on received power minimizes energy consumption.
• The experimental results validate the feasibility and effectiveness of the proposed energy-saving techniques.