Double-pulse laser based on a semiconductor optical amplifier.

Area of Science:

• Optics and Photonics
• Semiconductor Lasers
• Fiber Optics

Background:

• Semiconductor optical amplifiers (SOAs) are crucial components in modern optical systems.
• Controlling pulse characteristics in fiber lasers is essential for various applications.
• Asymmetric placement of gain media can influence laser dynamics.

Purpose of the Study:

• To propose and demonstrate a novel double-pulse fiber laser design.
• To investigate the effect of SOA placement on laser output.
• To achieve tunable repetition frequencies and pulse widths.

Main Methods:

• A fiber loop laser incorporating an asymmetrically placed semiconductor optical amplifier (SOA) was constructed.
• A polarization controller was used to tune laser parameters.
• Optical pulses were analyzed for repetition frequency and pulse width.

Main Results:

• The proposed laser successfully generated double pulses.
• Repetition frequencies of 10.05 MHz and 12.70 MHz were observed.
• Pulse widths of 33.40 ns and 30.13 ns were measured, with identical widths for the double pulses.

Conclusions:

• The asymmetric SOA placement in a short fiber loop enables stable double-pulse generation.
• The laser design offers control over repetition frequency and pulse width through polarization adjustment.
• This double-pulse laser has potential applications in optical communications and sensing.