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Wavelength-selective switch with direct few mode fiber integration.

D M Marom, J Dunayevsky, D Sinefeld

    Optics Express
    |April 4, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study presents the first wavelength-selective switch (WSS) integrating few-mode fibers (FMF). It addresses mode-dependent losses (MDL) in FMF-WSS systems, offering design guidelines for improved performance.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Photonics

    Background:

    • Few-mode fibers (FMF) offer increased transmission capacity by supporting multiple spatial modes.
    • Wavelength-selective switches (WSS) are crucial components in optical networks for dynamic wavelength routing.
    • Integrating FMF directly into WSS presents challenges in managing mode-dependent losses (MDL).

    Purpose of the Study:

    • To describe the first realization of a free-space optics WSS with direct FMF integration.
    • To identify, analyze, and confirm sources of MDL in this novel FMF-WSS.
    • To provide design guidelines for mitigating MDL and investigate the impact of cascaded filtering on data transmission.

    Main Methods:

    • Development and characterization of a free-space optics FMF-WSS using a phase spatial light modulator.
    • Analytical and experimental investigation of mode-dependent losses (MDL) arising from fiber coupling and mode clipping.
    • Experimental study of data transmission performance under cascaded passband filtering and MDL build-up.

    Main Results:

    • Successful demonstration of a WSS directly integrating FMF, capable of steering spectral beams with three spatial modes.
    • Identification and experimental confirmation of MDL sources, including imperfect imaging and spectral channel edge effects.
    • Validation of design guidelines for reducing MDL, applicable to systems with higher spatial mode counts.
    • Detailed experimental analysis of the impact of cascaded filtering and MDL on data transmission.

    Conclusions:

    • The presented FMF-WSS is a significant advancement for future high-capacity optical networks.
    • Understanding and mitigating MDL is critical for the reliable operation of FMF-based WSS.
    • The provided design guidelines offer a pathway to enhance the performance and scalability of FMF-WSS technology.