Experimental demonstration of a DSP-based cross-channel interference cancellation technique for application in...

Area of Science:

• Optical Communications
• Digital Signal Processing
• Passive Optical Networks

Background:

• Passive optical networks (PONs) face challenges with cross-channel interference (CCI).
• Intensity-modulation and direct-detection (IMDD) systems are widely used but susceptible to interference.
• Existing methods for interference mitigation may lack efficiency or flexibility.

Purpose of the Study:

• To experimentally demonstrate and investigate a DSP-based cross-channel interference cancellation (CCIC) technique.
• To evaluate the performance improvements of CCIC in a two-channel DFMA PON system.
• To analyze the impact of CCIC on bit error rates (BER), transmission capacity, and optical power budget.

Main Methods:

• Experimental demonstration of a DSP-based CCIC technique.
• Implementation within a two-channel point-to-point DFMA PON system using IMDD.
• Systematic investigation of CCIC performance under various conditions.

Main Results:

• CCIC achieves initial condition-free, fast convergence, and modulation format independence.
• A single iteration of CCIC reduces OFDM subcarrier BERs by over 1000 times.
• Transmission capacity increases up to 19 times, and optical power budget improves by up to 3.5dB.

Conclusions:

• The DSP-based CCIC technique offers substantial performance enhancements for DFMA PONs.
• CCIC has the potential to significantly improve the efficiency and reach of future PON systems.
• This technique provides a robust solution for mitigating interference in IMDD-based optical networks.