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Quasi-light Storage for Optical Data Packets

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Robust channel estimation in optical OFDM via IQ separation pulse compression noise rejection.

Kunping Luo, Guo-Wei Lu, Zhouyi Hu

|May 1, 2025

Summary

A new channel estimation technique, in-phase and quadrature separation pulse compression noise rejection (IQS-PCNR), improves optical receiver sensitivity and data rates in IMDD optical OFDM systems. This method offers significant performance gains over traditional techniques with similar complexity.

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Area of Science:

Optical communications
Signal processing

Background:

Intensity modulation and direct detection (IMDD) optical orthogonal frequency division multiplexing (OFDM) systems are crucial for high-speed data transmission.
Accurate channel estimation is vital for optimizing performance in these systems.

Purpose of the Study:

To introduce and evaluate an innovative channel estimation technique, in-phase and quadrature separation pulse compression noise rejection (IQS-PCNR).
To demonstrate the performance improvements of IQS-PCNR compared to existing methods in IMDD optical OFDM systems.

Main Methods:

The IQS-PCNR technique utilizes pulse compression for channel impulse response (CIR) estimation.
A noise rejection window is incorporated to mitigate residual noise.
The method was experimentally validated over a 2-km standard single-mode fiber (SSMF) link.

Main Results:

IQS-PCNR significantly enhances optical receiver sensitivity by 2.87 dB and 0.61 dB compared to least squares (LS) and intra-symbol frequency-domain averaging (ISFA), respectively.
Achievable bitrate increases by 3.65 Gbps and 1.85 Gbps over LS and ISFA at the hard-decision forward error correction (HD-FEC) threshold.
IQS-PCNR allows for more hardware-efficient generation of real pilot signals.

Conclusions:

IQS-PCNR offers superior performance in terms of receiver sensitivity and achievable bitrate for IMDD optical OFDM systems.
The technique achieves these improvements with comparable complexity to conventional methods.
IQS-PCNR presents a promising solution for advanced optical communication systems.