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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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InP monolithically integrated coherent transmitter.

N Andriolli, F Fresi, F Bontempi

    Optics Express
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel indium phosphide (InP) photonic integrated circuit was developed for coherent transmission. This integrated transmitter achieved 40 Gb/s using its own laser and 128 Gb/s with an external laser.

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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Coherent optical communication systems require advanced transmitters for high-speed data transmission.
    • Indium phosphide (InP) is a key material for fabricating high-performance photonic integrated circuits (PICs).

    Purpose of the Study:

    • To design, fabricate, and test a novel monolithically integrated coherent transmitter based on InP.
    • To evaluate the performance of the integrated transmitter for polarization-division multiplexing quadrature phase-shift keying (PDM-QPSK) signals.

    Main Methods:

    • Design and fabrication of a PIC comprising a distributed Bragg reflector (DBR) laser and a Mach-Zehnder modulator (MZM) with tunable power splitters.
    • Back-to-back coherent transmission experiments were conducted.

    Main Results:

    • The integrated transmitter demonstrated successful PDM-QPSK signal transmission at 10 Gbaud (40 Gb/s) using the on-chip DBR laser.
    • Transmission rates of up to 32 Gbaud (128 Gb/s) were achieved when using an external low phase noise laser.

    Conclusions:

    • The developed InP monolithically integrated coherent transmitter shows promise for high-speed optical communication systems.
    • The results highlight the potential of integrated photonics for advancing coherent transmission technologies.