A novel frequency 32-tupling ROF system without bit walk-off effect based on MZM with inserting pilot.

Area of Science:

• Photonics and Optical Communications
• Millimeter Wave Technology
• Radio over Fiber Systems

Background:

• Radio over Fiber (ROF) systems are crucial for high-frequency signal transmission.
• Chromatic dispersion in optical fibers causes bit walk-off, limiting transmission distance.
• Efficient frequency multiplication is essential for advanced ROF applications.

Purpose of the Study:

• To propose and verify a novel scheme for a frequency 32-tupling MMW ROF system.
• To eliminate the bit walk-off effect in MMW ROF systems.
• To enhance fiber transmission distance and downlink performance.

Main Methods:

• A sidebands generator (SG) using eight Mach-Zehnder modulators (MZMs) to produce ±16th order sidebands.
• Modulation of RF drive signals with data using electrical phase modulators (PM) and electrical gainers (EG).
• Integration of a pilot signal for carrier reuse and a fiber Bragg grating (FBG) filter at the base station.

Main Results:

• Successfully generated ±16th order sidebands for frequency multiplication.
• Demonstrated data modulation onto the +16th order sideband.
• Achieved frequency 32-tupling MMW signal generation with downlink data, overcoming bit walk-off.

Conclusions:

• The proposed scheme effectively overcomes bit walk-off caused by fiber chromatic dispersion.
• The system significantly increases achievable fiber transmission distances.
• The novel approach improves downlink performance, showing promise for future ROF systems.