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Related Concept Videos

Zener Diodes01:16

Zener Diodes

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Zener diodes are specialized semiconductor devices designed to operate in the reverse breakdown region, where they allow current to flow into the cathode, making it positive relative to the anode. This reverse operation distinguishes Zener diodes from conventional diodes and enables their use in various applications, most notably as voltage regulators. One of the defining characteristics of Zener diodes is their nearly vertical I-V (current-voltage) characteristic curve above a certain...
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Related Experiment Video

Updated: Apr 12, 2026

Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Travelling-wave Mach-Zehnder modulators functioning as optical isolators.

Po Dong

    Optics Express
    |May 14, 2015
    PubMed
    Summary

    Researchers developed a novel optical isolator using a standard travelling-wave modulator, eliminating the need for magneto-optical materials. This active optical isolator offers high isolation and broad bandwidth for integrated photonics applications.

    Area of Science:

    • Integrated Optics
    • Photonics
    • Non-linear Optics

    Background:

    • On-chip optical isolators are crucial for integrated photonic circuits.
    • Existing isolators often rely on magneto-optical materials, posing fabrication and integration challenges.
    • A non-reciprocal device without magnetic materials is highly desirable.

    Purpose of the Study:

    • To demonstrate a travelling-wave modulator can function as an optical isolator.
    • To achieve high isolation and broad bandwidth using a readily available device.
    • To provide a practical solution for non-reciprocal light routing in photonic integrated circuits.

    Main Methods:

    • Utilizing a standard travelling-wave modulator driven by a single radio-frequency signal.
    • Operating the device under a specific modulation condition to induce non-reciprocal behavior.

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  • Characterizing isolation, bandwidth, and insertion loss using standard optical measurements.

    • Main Results:

    • Achieved over 12.5 dB isolation across an 11.3-THz bandwidth at telecommunication wavelengths.
    • Demonstrated a fiber-to-fiber insertion loss of 5.5 dB.
    • Verified functionality in a laser system, preventing instability from back reflections.

    Conclusions:

    • A travelling-wave modulator can act as an effective optical isolator without magneto-optical materials.
    • The proposed active isolator architecture is simple, efficient, and compatible with existing photonic platforms.
    • This approach offers a practical solution for non-reciprocal light routing in integrated photonics.