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Investigation of PMD in direct-detection optical OFDM with zero padding.

Xiang Li, Arokiaswami Alphones, Wen-De Zhong

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Zero padding optical orthogonal frequency division multiplexing (ZP-OFDM) offers superior polarization-mode dispersion (PMD) tolerance in direct-detection systems. This enhanced performance stems from frequency domain oversampling, improving resilience against differential group delay.

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Area of Science:

Optical Communications
Signal Processing
Digital Transmission

Background:

Polarization-mode dispersion (PMD) is a significant impairment in optical communication systems.
Direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems are susceptible to PMD.
Conventional equalization methods for ZP-OFDM may not fully mitigate PMD effects.

Purpose of the Study:

To investigate the PMD effect on ZP-OFDM in DDO-OFDM systems.
To evaluate the performance of conventional equalization for ZP-OFDM under PMD.
To propose and assess an improved equalization method for enhanced PMD tolerance.

Main Methods:

Analysis of ZP-OFDM's PMD characteristics in DDO-OFDM.
Implementation and testing of conventional ZP-OFDM equalization.
Development and simulation of a novel equalization method using sorted QR decomposition.
Numerical simulations comparing ZP-OFDM with CP-OFDM under varying PMD conditions.

Main Results:

ZP-OFDM's performance improvement is attributed to frequency domain oversampling (FDO) induced inter-carrier interference (ICI).
The proposed sorted QR decomposition equalization method enhances ZP-OFDM performance.
ZP-OFDM demonstrates significantly higher PMD tolerance compared to CP-OFDM in DDO-OFDM systems.
This improved tolerance is particularly evident when channel spectral nulls align with specific differential group delay (DGD) values.

Conclusions:

ZP-OFDM offers a notable advantage in PMD mitigation for DDO-OFDM.
The FDO-induced ICI in ZP-OFDM plays a crucial role in its PMD resilience.
The proposed QR decomposition-based equalization further boosts performance, making ZP-OFDM a promising technique for high-speed optical systems facing PMD.