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Writing Bragg Gratings in Multicore Fibers
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Phase retrieval in multicore fiber bundles.

Dani Kogan, Siddharth Sivankutty, Viktor Tsvirkun

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    |February 2, 2017
    PubMed
    Summary

    Phase retrieval offers a new method for characterizing multicore fiber bundles used in endoscopy. This technique bypasses the need for complex interferometric setups and distal tip access, enabling real-time monitoring of phase distortions.

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    Area of Science:

    • Optics
    • Biomedical Engineering
    • Fiber Optics

    Background:

    • Multicore fiber bundles are crucial for miniature endoscopy, enabling direct imaging with minimal distal optics.
    • Current methods for phase offset characterization, like off-axis holography, necessitate interferometric setups and distal tip access.
    • Spatial light modulators are increasingly integrated with fiber bundles for advanced endoscopic applications.

    Purpose of the Study:

    • To investigate phase retrieval as an alternative method for determining relative phase offsets in multicore fiber bundles.
    • To compare the efficacy of phase retrieval in disordered versus periodic fiber bundles.
    • To demonstrate experimental validation of phase retrieval for multicore fiber characterization.

    Main Methods:

    • Utilizing phase retrieval algorithms to extract phase information from light transmitted through multicore fiber bundles.
    • Comparing the performance of phase retrieval in disordered fiber bundles against periodic configurations.
    • Conducting experimental measurements with simultaneously illuminated cores to validate the method.

    Main Results:

    • Disordered fiber bundles demonstrate superior performance for phase retrieval compared to periodic ones in noise-free conditions.
    • Accurate retrieval of phase information was experimentally achieved for up to 10 simultaneously illuminated cores.
    • Phase retrieval eliminates the need for interferometric setups and distal tip access.

    Conclusions:

    • Phase retrieval is a viable and potentially real-time method for monitoring phase distortions in multicore fiber bundles.
    • This technique simplifies the characterization process for advanced endoscopic applications.
    • The findings pave the way for more accessible and efficient optical fiber-based imaging systems.