Comblike dispersion-profiled fiber for soliton pulse train generation.

Area of Science:

• Photonics
• Optical Communications
• Fiber Optics

Background:

• Soliton pulse trains are crucial for high-speed optical communications.
• Generating stable, high-repetition-rate soliton pulse trains optically remains challenging.
• Nonlinear optical effects in fibers are key to manipulating optical signals.

Purpose of the Study:

• To propose and demonstrate a novel optical fiber for generating soliton pulse trains.
• To achieve high-repetition-rate soliton generation using nonlinear transformation of optical beat signals.
• To suppress stimulated Brillouin scattering in the proposed fiber structure.

Main Methods:

• A comblike dispersion-profiled fiber (CDPF) was designed using alternating segments of standard and dispersion-shifted fibers.
• A dual-frequency erbium fiber laser with fiber grating reflectors was used as the beat signal generator.
• The CDPF was integrated into an all-optical fiber source to generate and characterize the soliton pulse train.

Main Results:

• A stable 59.1-GHz train of 2.2-picosecond (ps) solitons was successfully generated.
• The CDPF demonstrated significant suppression of stimulated Brillouin scattering.
• The optical beat signal exhibited low phase noise (< 5 x 10(-5)) and narrow linewidths (16 kHz).

Conclusions:

• The proposed CDPF is an effective platform for generating high-repetition-rate optical soliton pulse trains.
• The integrated all-optical fiber source offers a promising solution for future optical communication systems.
• Suppression of stimulated Brillouin scattering in CDPF is critical for efficient nonlinear optical signal processing.