Pedestal-free 25-GHz subpicosecond optical pulse source for 16 × 25-Gb/s OTDM based on phase modulation and...

Area of Science:

• Photonics
• Optical Engineering
• Telecommunications

Background:

• Generating high-quality optical pulses is crucial for high-speed optical communication systems.
• Existing methods often struggle with pulse pedestal and duty cycle limitations.

Purpose of the Study:

• To propose and experimentally demonstrate a new scheme for generating ultra-short, pedestal-free optical pulses.
• To improve optical pulse characteristics for enhanced performance in optical transmitters.

Main Methods:

• Utilizing an ultra-short chirped seed pulse generator.
• Employing a dual-stage fiber-based nonlinear pulse processing stage including soliton compression and Mamyshev reshaping.
• Implementing phase modulation and linear-chirp compensation.

Main Results:

• Achieved pedestal-free optical pulses with a 2% duty cycle and a 27 dB extinction ratio.
• Successfully generated optical seed pulses with a 9.8% duty cycle and a reduced pedestal after initial processing.
• Demonstrated the application of the generated pulses in a 16x25-Gb/s on-off keying optical time-division multiplexing transmitter.

Conclusions:

• The proposed fiber-based nonlinear pulse processing scheme effectively generates high-quality optical pulses.
• The technique significantly improves pulse duty cycle and extinction ratio, overcoming limitations of previous methods.
• The developed optical pulse source is suitable for high-capacity optical communication applications.