Generation of all-fiber optical Manchester code using nonlinear polarization rotation

Area of Science:

• Photonics and Optical Communications
• Nonlinear Optics
• Fiber Optic Technology

Background:

• High-speed optical data transmission requires efficient encoding schemes.
• Manchester coding offers advantages in clock recovery and data integrity.
• Existing methods for optical Manchester code generation can be complex and costly.

Purpose of the Study:

• To experimentally demonstrate a novel all-fiber optical Manchester code generation method.
• To achieve high-speed (10 Gbit/s) Manchester coding using a simplified setup.
• To evaluate the performance and characteristics of the generated optical Manchester code.

Main Methods:

• Utilizing nonlinear polarization rotation in a 1-km highly-nonlinear fiber.
• Employing two orthogonally aligned 8-dBm pump signals.
• Inputting a 10 Gbit/s non-return-to-zero (NRZ) data stream and a 10 GHz optical clock as pump signals.
• Analyzing the output waveform and optical spectrum.

Main Results:

• Successful generation of all-fiber optical Manchester code at 10 Gbit/s.
• Achieved a high extinction ratio of 33 dB in a dummy channel.
• Demonstrated the encoder's functionality with standard NRZ data and optical clock signals.
• Presented detailed analysis of the output signal characteristics.

Conclusions:

• The proposed all-fiber approach provides an effective and simplified method for optical Manchester code generation.
• The demonstrated technique is suitable for high-speed optical communication systems.
• Nonlinear polarization rotation in highly nonlinear fiber is a viable mechanism for advanced optical signal processing.