Optical Polarization Division Multiplexing Transmission System Based on Simplified Twin-SSB Modulation.

Area of Science:

• Optical Communications
• Signal Processing

Background:

• Twin-single sideband (Twin-SSB) modulation transmits individual data on left and right sidebands, meeting high data traffic demands.
• Existing Twin-SSB systems can be complex, necessitating simpler, more spectrally efficient solutions.

Purpose of the Study:

• To propose and evaluate a polarization division multiplexing (PDM) Twin-SSB modulation scheme.
• To reduce system complexity and enhance spectral efficiency in optical fiber transmission.

Main Methods:

• Developed a PDM Twin-SSB modulation scheme utilizing a de-mapping algorithm instead of optical bandpass filters.
• Implemented 3-arr phase-shift-keying (3PSK) for the LSB and quadrature phase-shift keying (QPSK) for the RSB.
• Simulated bit error ratio (BER) performance for X and Y polarizations at various baud rates (8-16 Gbaud) in back-to-back and 2 km SSMF transmission.

Main Results:

• The proposed PDM Twin-SSB scheme demonstrated effective performance across different baud rates and transmission conditions.
• Simulation results confirmed the viability of extracting LSB and RSB signals using a de-mapping algorithm, reducing complexity.
• The scheme achieved high data transmission capacity suitable for short-distance applications.

Conclusions:

• The PDM Twin-SSB modulation scheme offers a practical and effective solution for future short-distance optical transmission.
• The system's simplified structure, low algorithm complexity, and high data capacity make it a cost-effective choice.