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Improving performance of channel equalization in RSOA-based WDM-PON by QR decomposition.

Xiang Li, Wen-De Zhong, Arokiaswami Alphones

|October 20, 2015

Summary

This study overcomes reflective semiconductor optical amplifier (RSOA) limitations in wavelength division multiplexed passive optical networks (WDM-PONs). Applying QR decomposition channel equalization (QR-CE) boosts data rates for discrete Fourier transform-spreading orthogonal frequency division multiplexing (DFT-S OFDM) signals.

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Area of Science:

Optical communications
Signal processing
Telecommunications engineering

Background:

Reflective semiconductor optical amplifiers (RSOAs) limit bit rates in wavelength division multiplexed passive optical networks (WDM-PONs) due to low modulation bandwidth.
Discrete Fourier transform-spreading orthogonal frequency division multiplexing (DFT-S OFDM) is a promising technique for high-speed optical transmission.

Purpose of the Study:

To enhance the performance of DFT-S OFDM signals in RSOA-based WDM-PONs.
To overcome the bit rate limitations imposed by RSOA modulation bandwidth.

Main Methods:

Application of QR decomposition in channel equalization (QR-CE) to achieve successive interference cancellation (SIC).
Experimental demonstration of a 15.5-Gb/s transmission over 20-km standard single-mode fiber (SSMF) using an RSOA with ~800 MHz bandwidth.
Investigation of QR-CE parameter impacts, including sub-band and pilot configurations.

Main Results:

The proposed QR-CE significantly improves bit error rate (BER) performance compared to conventional equalizers for DFT-S OFDM signals.
A 15.5-Gb/s transmission was successfully demonstrated, overcoming RSOA bandwidth limitations.
Optimal QR-CE performance was achieved with 2 sub-bands per OFDM symbol and 1 pilot per sub-band, maintaining high spectral efficiency.

Conclusions:

QR-CE combined with DFT-S OFDM effectively mitigates RSOA bandwidth limitations in WDM-PONs.
The developed equalization technique offers superior BER performance and enables higher data rates.
Specific parameter settings for QR-CE ensure optimal performance and spectral efficiency in optical communication systems.