Direct-detection polarization division multiplexed orthogonal frequency-division multiplexing transmission systems...

Area of Science:

• Optical communications engineering
• Signal processing in telecommunications
• Photonics and wave phenomena

Background:

• Polarization division multiplexing (PDM) and orthogonal frequency-division multiplexing (OFDM) are advanced techniques for increasing optical data transmission capacity.
• Traditional PDM-OFDM systems often require complex dynamic polarization tracking to compensate for polarization fluctuations.
• Direct-detection schemes simplify receiver design but can be sensitive to polarization states.

Purpose of the Study:

• To demonstrate a direct-detection PDM-OFDM system that operates without dynamic polarization tracking.
• To achieve reliable high-speed data transmission across all possible received states of polarization.
• To assess the system's performance in terms of bit-error rate and tolerance to fiber impairments.

Main Methods:

• Implementation of a multiple-input multiple-output (MIMO) assisted system leveraging a polarization-diverse receiver.
• Experimental setup for direct-detection PDM-OFDM.
• Transmission of 50 Gbps data over 100 km of standard single-mode fiber.

Main Results:

• Successful demonstration of a direct-detection PDM-OFDM scheme without the need for dynamic polarization tracking.
• Achievement of a bit-error rate below 10(-) for all tested received states of polarization.
• Demonstration of 50 Gbps PDM-OFDM transmission over 100 km of single-mode fiber without significant dispersion-induced penalty.

Conclusions:

• The proposed system offers a simplified and robust approach to high-speed optical communication by eliminating polarization tracking.
• The polarization-diverse receiver effectively handles all polarization states, ensuring reliable data reception.
• This technology holds promise for future cost-effective and high-capacity fiber-optic networks.