All-optical generation of binary phase-coded microwave pulses without baseband components based on a dual-parallel...

Area of Science:

• Optoelectronics
• Microwave Engineering
• Optical Signal Processing

Background:

• Traditional microwave pulse generation often requires complex baseband components.
• Achieving high-quality binary phase-coded microwave pulses demands precise control over optical modulation.
• Existing all-optical methods may face limitations in stability, tuning range, or signal quality.

Purpose of the Study:

• To propose and demonstrate an all-optical system for generating binary phase-coded microwave pulses.
• To achieve accurate π phase shifts without relying on baseband signal processing.
• To present a simple, stable, and high-performance solution for optical microwave pulse generation.

Main Methods:

• Utilizing a dual-parallel Mach-Zehnder modulator (DPMZM) as the core component.
• Precisely applying coding and microwave signals to a biased DPMZM.
• Implementing an all-optical architecture to avoid baseband electronics.

Main Results:

• Successfully generated binary phase-coded microwave pulses with accurate π phase shifts.
• Demonstrated the system's capability for generating 2-Gbit/s 14-GHz and 4-Gbit/s 16-GHz pulses.
• Verified high signal quality and performance across varying signal amplitudes and carrier powers.
• Confirmed the system's simple and stable all-optical structure with a large frequency tuning range.

Conclusions:

• The proposed all-optical system effectively generates high-quality binary phase-coded microwave pulses.
• The DPMZM-based scheme offers a simplified and stable approach compared to traditional methods.
• This technology holds promise for advanced optical communication and signal processing applications.