PMD tolerance of polarization division multiplex transmission using return-to-zero coding

Area of Science:

• Optical communications
• Photonics
• High-speed data transmission

Background:

• Polarization division multiplexing (PolDM) enhances data capacity in optical fiber systems without requiring additional bandwidth.
• Polarization mode dispersion (PMD) is a key limiting factor for transmission distance in compensated optical links.
• Return-to-zero (RZ) coding is gaining interest for advanced optical transmission formats.

Purpose of the Study:

• To evaluate the polarization mode dispersion (PMD) tolerance of polarization division multiplexing (PolDM) in optical communication systems.
• To compare the PMD tolerance of PolDM with standard binary intensity modulation.
• To assess the suitability of PolDM for high-capacity optical networks facing PMD challenges.

Main Methods:

• Numerical simulations were employed to model and analyze PolDM performance under various PMD conditions.
• A physical transmission experiment was conducted to validate simulation results and assess real-world PMD tolerance.
• Differential group delay (DGD) was used as a metric to quantify PMD impact on signal integrity.

Main Results:

• Polarization division multiplexing (PolDM) demonstrates significant tolerance to polarization mode dispersion (PMD).
• For a given data rate, PolDM supports a differential group delay (DGD) comparable to or exceeding standard binary intensity modulation.
• The findings indicate that PolDM maintains signal quality even with substantial PMD.

Conclusions:

• Polarization division multiplexing (PolDM) is a viable and attractive modulation scheme for increasing optical network capacity.
• PolDM effectively mitigates capacity limitations caused by polarization mode dispersion (PMD) with minimal additional system complexity.
• The study confirms PolDM's potential for future high-capacity optical communication systems.