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Related Experiment Video

Updated: Jul 9, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
08:41

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Published on: August 16, 2012

Lens-free in-line optical isolators.

T Sato, J Sun, R Kasahara

    Optics Letters
    |December 15, 2007
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel lens-free optical isolator by integrating a chip into thermally expanded core (TEC) fiber. This technique simplifies alignment and achieves excellent optical performance, including low insertion loss and high isolation.

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    Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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    Published on: August 16, 2012

    Lensless Fluorescent Microscopy on a Chip
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    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Optical isolators are crucial components in fiber optic systems, preventing back-reflected light.
    • Traditional isolators often require complex alignment and bulky packaging.
    • Integrating isolator functionality directly into fiber offers a more compact and efficient solution.

    Purpose of the Study:

    • To construct a lens-free, in-line optical isolator.
    • To demonstrate a simplified integration method using thermally expanded core (TEC) fiber.
    • To evaluate the optical performance of the integrated isolator.

    Main Methods:

    • Fabrication of TEC fibers by heating standard single-mode fibers to achieve a large core diameter (49 µm).
    • Embedding a custom-designed isolator chip, composed of rutile wedges and garnet plates, into the TEC fiber.
    • Optical characterization of the integrated device at a 1.55 µm wavelength.

    Main Results:

    • Successful fabrication of TEC fibers with low loss and a large spot diameter.
    • The integrated optical isolator exhibited an insertion loss of 0.45 dB.
    • Achieved isolation of over 50 dB at 1.55 µm wavelength.

    Conclusions:

    • The integration technique of embedding an isolator chip in TEC fiber is effective.
    • The fabricated lens-free optical isolator demonstrates excellent optical properties.
    • This approach offers a promising solution for compact and high-performance optical isolation.