Analysis of high-quality ultrashort pulse generation based on a dual-drive Mach-Zehnder modulator and chirp compensation

Area of Science:

• Photonics and Optics
• Ultrafast Lasers
• Optical Communications

Background:

• Generating ultrashort optical pulses is crucial for high-speed optical communications and advanced scientific research.
• Traditional methods for pulse generation often involve complex setups or limited flexibility.
• The dual-drive Mach-Zehnder modulator (DDMZM) offers a promising platform for integrated optical signal generation.

Purpose of the Study:

• To demonstrate high-quality picosecond pulse generation using a single-stage DDMZM.
• To achieve pulse compression through chirp compensation.
• To numerically investigate parameters affecting pulse formation and experimentally validate the results.

Main Methods:

• Utilized a single-stage DDMZM with sinusoidal microwave signals applied to its RF ports.
• Employed a single-mode fiber (SMF) for linear frequency chirp compensation.
• Numerically studied the influence of RF power difference, RF signal power, and DDMZM bias point on pulse formation.
• Simulated temporal pulse propagation in SMF to determine optimal chirp compensation length.

Main Results:

• Achieved generation of ultrashort pulses with a duration of 3.56 picoseconds.
• Experimentally realized pulses at a wavelength of 1.55 µm with a 25-GHz repetition rate.
• Identified optimal SMF length for effective chirp compensation.

Conclusions:

• Demonstrated a flexible and efficient method for generating high-quality ultrashort optical pulses.
• The DDMZM-based approach allows for easy customization of pulse characteristics by tuning RF generators and light sources.
• This technique holds potential for developing tailored optical pulses for diverse practical applications.