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Related Experiment Video

Updated: Jan 19, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Highly efficient passive InP polarization rotator-splitter.

Shahram Keyvaninia, Hendrik Boerma, Markus Wössner

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    This study presents a compact polarization beam splitter (PBS) for optical coherent receivers. The device achieves high polarization extinction ratios (PER) over C- and L-bands with a simple fabrication process.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Monolithic integration of polarization beam splitters (PBSs) is crucial for reducing the size and cost of optical coherent receivers.
    • Existing PBS designs often require complex fabrication processes, hindering widespread adoption.

    Purpose of the Study:

    • To demonstrate a highly efficient passive polarization rotator and splitter based on mode-evolution.
    • To develop a compact and cost-effective PBS for optical communication systems.

    Main Methods:

    • Fabrication of the device on an Indium Phosphide (InP) substrate using a single etch-step.
    • Utilizing an adiabatic mode-converter and an asymmetric Y-coupler for polarization splitting.
    • Characterization of the device's performance over the 1520 nm to 1620 nm wavelength range.

    Main Results:

    • Achieved a polarization extinction ratio (PER) better than 19 dB across the C- and L-bands (1520-1620 nm).
    • Obtained a peak PER of 24 dB for both TE and TM polarizations.
    • Demonstrated significant fabrication tolerance, with PER remaining above 17 dB even with +/- 200 nm width variations.

    Conclusions:

    • The demonstrated mode-evolution-based PBS offers a simple fabrication process and excellent performance.
    • This compact and robust device is suitable for reducing the form-factor and assembly cost of optical coherent receivers.