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Pulse selection at 1 MHz with electrooptic fiber switch.

Mikael Malmström¹, Oleksandr Tarasenko, Walter Margulis

¹Laser Physics, Dept of Applied Physics, Royal Institute of Technology (KTH), Roslagstullsbacken 21, SE-106 91 Stockholm, Sweden. mm@laserphysics.kth.se

|April 27, 2012

Summary

This study demonstrates a novel fiber-optic system for precise laser pulse selection. The all-silica fiber Sagnac loop achieves high-speed, high-extinction ratio pulse filtering for 1.5 µm wavelength light.

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Area of Science:

Photonics and Optical Engineering
Nonlinear Optics
Fiber Optics

Background:

High-repetition-rate laser systems require precise pulse selection.
Traditional methods can be complex and costly.
All-fiber solutions offer advantages in stability and integration.

Purpose of the Study:

To develop and demonstrate an all-fiber Sagnac loop for high-repetition-rate laser pulse selection.
To achieve high extinction ratios using nonlinear optical effects in electrooptic fibers.

Main Methods:

Utilized two 78-cm long electrooptic fibers with a nonlinear coefficient (χ((2))) of approximately 0.26 pm/V.
Integrated these fibers into a Sagnac interferometer configuration.
Operated the system at a 1 MHz repetition rate for 1.5 µm wavelength laser pulses.

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Main Results:

Achieved effective pulse selection for laser pulses arriving every 140 ns.
Demonstrated a high extinction ratio of -30 dB for selected pulses.
The entire experimental setup was constructed using standard silica fiber components.

Conclusions:

The proposed all-fiber Sagnac loop is a viable and effective method for high-repetition-rate laser pulse selection.
The system offers high performance in terms of repetition rate and extinction ratio.
This approach provides a compact and robust solution for optical pulse manipulation.