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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Duobinary pulse shaping for frequency chirp enabled complex modulation.

Di Che, Feng Yuan, Hamid Khodakarami

    Optics Letters
    |September 9, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Chirp-enabled direct modulation (DM) in optical systems can be optimized using duobinary pulse shaping (DB-PS). This technique reduces bandwidth needs but requires advanced receivers for managing controlled inter-symbol interference (ISI).

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Photonics

    Background:

    • Frequency chirp in optical direct modulation (DM) traditionally limits optical transmission system performance by broadening spectra and increasing susceptibility to chromatic dispersion.
    • This broadening leads to inter-symbol interference (ISI), a significant challenge in high-speed optical networks.
    • A novel approach views chirp as frequency modulation, enabling DM to generate a 2-D signal (intensity and phase) for enhanced performance.

    Purpose of the Study:

    • To investigate the application of duobinary pulse shaping (DB-PS) in chirp-enabled direct modulation (DM) optical systems.
    • To analyze the impact of DB-PS on optical bandwidth requirements and system optical signal-to-noise ratio (OSNR) sensitivity.
    • To explore the necessary modifications in receiver design for effective signal processing.

    Main Methods:

    • Theoretical study of duobinary pulse shaping (DB-PS) applied to chirp-enabled direct modulation (DM).
    • Analysis of the trade-offs between reduced optical bandwidth and system OSNR sensitivity.
    • Implementation and experimental verification of a modified maximum likelihood sequence estimation (MLSE) receiver with an additional tap.

    Main Results:

    • Duobinary pulse shaping (DB-PS) effectively reduces the optical bandwidth requirements for chirp-enabled direct modulation (DM) systems.
    • This bandwidth reduction comes at the cost of decreased system OSNR sensitivity.
    • A 10-Gbaud duobinary PAM-4 transmission experiment successfully verified the modified MLSE receiver, demonstrating its ability to handle the controlled ISI introduced by DB-PS.

    Conclusions:

    • Duobinary pulse shaping is a viable technique for managing bandwidth in chirp-enabled direct modulation optical systems.
    • The controlled inter-symbol interference (ISI) introduced by DB-PS necessitates advanced receiver equalization, such as MLSE with additional taps.
    • This study validates the effectiveness of DB-PS and modified MLSE in improving optical transmission system performance and overcoming previous limitations.