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Related Experiment Videos

Anomalous dispersion in a solid, silica-based fiber.

S Ramachandran1, S Ghalmi, J W Nicholson

  • 1OFS Laboratories, Somerset, New Jersey 08873, USA. sidr@ieee.org

Optics Letters
|August 12, 2006
PubMed
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We developed a novel all-solid silica fiber leveraging higher-order modes to achieve anomalous dispersion. This fiber enables compact, high-performance femtosecond lasers by providing precise dispersion control.

Area of Science:

  • Optical Fiber Technology
  • Laser Physics
  • Materials Science

Background:

  • Silica fibers typically exhibit normal dispersion at common wavelengths, limiting applications in ultrafast optics.
  • Engineering dispersion in optical fibers is crucial for controlling pulse characteristics in laser systems.

Purpose of the Study:

  • To demonstrate an all-solid silica fiber with anomalous dispersion at wavelengths where silica material dispersion is negative.
  • To utilize higher-order modes for enhanced dispersion engineering.
  • To enable compact and efficient femtosecond laser systems.

Main Methods:

  • Exploiting higher-order modes in a silica-based fiber for dispersion engineering.
  • Utilizing low-loss in-fiber gratings for coupling to specific higher-order modes.

Related Experiment Videos

  • Fabricating a 5 m long fiber module centered at 1080 nm.

    • Main Results:

    • Achieved anomalous dispersion of +60 ps/nm·km at 1080 nm using higher-order modes.
    • Realized a fiber module with 300 fs/nm dispersion, 51 nm bandwidth, and 0.1 dB insertion loss.
    • Demonstrated functionality as a critical component for an all-fiber, Yb-based, mode-locked femtosecond ring laser.

    Conclusions:

    • An all-solid silica fiber utilizing higher-order modes can effectively engineer anomalous dispersion.
    • This fiber technology is a key enabler for advanced ultrafast laser systems.
    • The developed fiber module offers a compact and efficient solution for dispersion management in femtosecond lasers.