Full-duty triangular pulse generation based on a polarization-multiplexing dual-drive Mach-Zehnder modulator

Area of Science:

• Photonics
• Microwave Engineering
• Integrated Optics

Background:

• Generating precise microwave waveforms is crucial for advanced communication systems.
• Existing methods often require complex setups, large modulation indices, or optical filters, limiting flexibility and operational range.

Purpose of the Study:

• To propose and demonstrate a simple, flexible photonic approach for generating triangular microwave waveforms.
• To overcome limitations of previous methods by eliminating the need for specific large modulation indices or optical filters.

Main Methods:

• Utilizing a single integrated polarization-multiplexing dual-drive Mach-Zehnder modulator (PM-DMZM).
• Employing one sub-Mach-Zehnder modulator (MZM) driven by a fundamental frequency and the other by a frequency-tripled signal.
• Adjusting the polarizer to control the power ratio of generated optical sidebands.

Main Results:

• Successfully generated a 5-GHz triangular-shaped microwave waveform signal.
• Demonstrated the generation of triangular waveforms with varying modulation indices.
• Achieved a robust system with a wide operational frequency range due to the absence of filters and large modulation index requirements.

Conclusions:

• The proposed photonic approach offers a simple and flexible method for generating triangular microwave waveforms.
• The technique's robustness and wide operational frequency range make it suitable for various applications.
• This method provides an efficient alternative to existing waveform generation techniques.