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Optical microfiber coil delay line.

M Sumetsky1

  • 1OFS Laboratories, Somerset, NJ 08873, USA. sumetski@ofsoptics.com

Optics Express
|April 29, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates a theoretical optical delay line using coiled microfiber. The design offers broadband, miniature, and low-loss performance, significantly outperforming current miniature delay lines.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Miniature optical delay lines are crucial for various photonic applications.
  • Existing miniature delay lines suffer from high insertion loss and limited bandwidth.
  • Developing compact, low-loss optical delay lines remains a significant challenge.

Purpose of the Study:

  • To theoretically demonstrate the feasibility of a broadband, miniature, and low-loss optical delay line.
  • To propose a novel design utilizing a coiled microfiber with specific dimensions.
  • To introduce a compact, low-loss, and broadband connection method using a curved microfiber taper.

Main Methods:

  • Theoretical demonstration of a coiled microfiber optical delay line.
  • Analysis of mode shifting to prevent scattering under low-loss conditions.

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  • Design of a 100 ns feedforward delay line with specific dimensions (5 mm x 5 mm x 20 mm) at 1.5 microm wavelength.
  • Proposal of a curved microfiber taper for adiabatic mode conversion.

    • Main Results:

    • The proposed coiled microfiber delay line exhibits broadband, miniature, and low-loss characteristics.
    • Predicted insertion loss is approximately 0.004 dB/ns, two orders of magnitude lower than existing miniature delay lines.
    • The design dimensions can be further optimized for smaller footprints, especially for recirculating loop configurations.
    • A curved microfiber taper effectively connects straight and coiled microfiber sections with low loss.

    Conclusions:

    • The theoretical feasibility of a highly efficient miniature optical delay line using coiled microfiber is established.
    • The proposed design offers significant improvements in insertion loss and compactness.
    • The curved microfiber taper provides an effective solution for broadband, low-loss interfacing.