A hybrid WDM/OCDMA ring with a dynamic add/drop function based on Fourier code for local area networks.

Area of Science:

• Optical networking
• Telecommunications
• Signal processing

Background:

• Local area networks (LANs) require efficient data transmission.
• Hybrid Wavelength Division Multiplexing (WDM) and Optical Code Division Multiple Access (OCDMA) offer enhanced network capacity and flexibility.
• Dynamic add/drop functionalities are crucial for efficient resource allocation in ring networks.

Purpose of the Study:

• To propose and experimentally demonstrate a novel hybrid WDM/OCDMA ring network.
• To implement a dynamic add/drop function using Fourier codes for OCDMA.
• To evaluate the performance of the proposed system for LAN applications.

Main Methods:

• A hybrid WDM/OCDMA ring architecture was designed and built.
• Dynamic add/drop functionality was achieved by mechanically tuning Fourier encoders/decoders.
• Reflective Semiconductor Optical Amplifiers (RSOAs) with Fiber Bragg Gratings (FBGs) were used for optical source generation.
• A two-node ring network with a 4-chip Fourier encoder/decoder was experimentally tested.

Main Results:

• The system successfully demonstrated a dynamic add/drop function in a hybrid WDM/OCDMA ring.
• A bit error rate (BER) of less than 10^-9 was achieved over a 10.64 km span at 1.25 Gb/s.
• The 4-chip Fourier code effectively recovered matched signals from the complex code environment.

Conclusions:

• The proposed hybrid WDM/OCDMA ring network with dynamic Fourier code-based add/drop is a viable solution for high-performance LANs.
• The experimental results validate the system's efficiency and reliability for optical communication.
• This technology offers a promising approach for future scalable and flexible optical networks.