Precise Optical Modulation Using Extinction-Ratio and Chirp Tunable Single-Drive Mach-Zehnder Modulator

Yuya Yamaguchi, Atsushi Kanno, Tetsuya Kawanishi, Masayuki Izutsu, Hirochika Nakajima

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We analyzed the complex transfer function and modulation spectrum of the Mach-Zehnder (MZ) modulator with optical power and phase change imbalances. From the calculations, we found that the characteristic operation can be obtained in three cases: high extinction ratio, zero-chirp, and straight-line trajectory in the IQ plane. However, the results also indicate that we cannot achieve an operation equivalent to that of the ideal modulator, due to the small parasitic chirp in a single-drive modulator. To control the extinction ratio and chirp parameter individually, we propose an integrated modulator with some tunable Y-branches. By using the optical-power-imbalance tunable modulators, we experimentally demonstrate the characteristic operations and obtain the modulation spectrum equivalent to the ideal MZ modulator. However, compared to the ideal amplitude modulator, MZ modulators exhibit an intrinsic nonlinearity in the sinusoidal response. Therefore, we used a third-order nonlinearity compensation method using the superposition of electrical third-order harmonics. The measured spectrum consisted of only first-order modulation sidebands, which is equivalent to the ideal double-sideband suppressed-carrier modulation.

    Original languageEnglish
    JournalJournal of Lightwave Technology
    DOIs
    Publication statusAccepted/In press - 2017 Sep 29

    Fingerprint

    light modulation
    chirp
    modulators
    extinction
    modulation
    sidebands
    nonlinearity
    transfer functions
    trajectories
    harmonics

    Keywords

    • Amplitude modulation
    • Electro-optic modulators
    • Erbium
    • Intensity modulation
    • Interferometers
    • Optical device fabrication
    • Optical distortion
    • Optical fiber communication
    • Optical interferometry
    • Optical modulation
    • Optical modulation
    • Phase modulation

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Precise Optical Modulation Using Extinction-Ratio and Chirp Tunable Single-Drive Mach-Zehnder Modulator. / Yamaguchi, Yuya; Kanno, Atsushi; Kawanishi, Tetsuya; Izutsu, Masayuki; Nakajima, Hirochika.

    In: Journal of Lightwave Technology, 29.09.2017.

    Research output: Contribution to journalArticle

    @article{56abb5ea324d4dbf802fba125296ae8d,
    title = "Precise Optical Modulation Using Extinction-Ratio and Chirp Tunable Single-Drive Mach-Zehnder Modulator",
    abstract = "We analyzed the complex transfer function and modulation spectrum of the Mach-Zehnder (MZ) modulator with optical power and phase change imbalances. From the calculations, we found that the characteristic operation can be obtained in three cases: high extinction ratio, zero-chirp, and straight-line trajectory in the IQ plane. However, the results also indicate that we cannot achieve an operation equivalent to that of the ideal modulator, due to the small parasitic chirp in a single-drive modulator. To control the extinction ratio and chirp parameter individually, we propose an integrated modulator with some tunable Y-branches. By using the optical-power-imbalance tunable modulators, we experimentally demonstrate the characteristic operations and obtain the modulation spectrum equivalent to the ideal MZ modulator. However, compared to the ideal amplitude modulator, MZ modulators exhibit an intrinsic nonlinearity in the sinusoidal response. Therefore, we used a third-order nonlinearity compensation method using the superposition of electrical third-order harmonics. The measured spectrum consisted of only first-order modulation sidebands, which is equivalent to the ideal double-sideband suppressed-carrier modulation.",
    keywords = "Amplitude modulation, Electro-optic modulators, Erbium, Intensity modulation, Interferometers, Optical device fabrication, Optical distortion, Optical fiber communication, Optical interferometry, Optical modulation, Optical modulation, Phase modulation",
    author = "Yuya Yamaguchi and Atsushi Kanno and Tetsuya Kawanishi and Masayuki Izutsu and Hirochika Nakajima",
    year = "2017",
    month = "9",
    day = "29",
    doi = "10.1109/JLT.2017.2758421",
    language = "English",
    journal = "Journal of Lightwave Technology",
    issn = "0733-8724",
    publisher = "Institute of Electrical and Electronics Engineers Inc.",

    }

    TY - JOUR

    T1 - Precise Optical Modulation Using Extinction-Ratio and Chirp Tunable Single-Drive Mach-Zehnder Modulator

    AU - Yamaguchi, Yuya

    AU - Kanno, Atsushi

    AU - Kawanishi, Tetsuya

    AU - Izutsu, Masayuki

    AU - Nakajima, Hirochika

    PY - 2017/9/29

    Y1 - 2017/9/29

    N2 - We analyzed the complex transfer function and modulation spectrum of the Mach-Zehnder (MZ) modulator with optical power and phase change imbalances. From the calculations, we found that the characteristic operation can be obtained in three cases: high extinction ratio, zero-chirp, and straight-line trajectory in the IQ plane. However, the results also indicate that we cannot achieve an operation equivalent to that of the ideal modulator, due to the small parasitic chirp in a single-drive modulator. To control the extinction ratio and chirp parameter individually, we propose an integrated modulator with some tunable Y-branches. By using the optical-power-imbalance tunable modulators, we experimentally demonstrate the characteristic operations and obtain the modulation spectrum equivalent to the ideal MZ modulator. However, compared to the ideal amplitude modulator, MZ modulators exhibit an intrinsic nonlinearity in the sinusoidal response. Therefore, we used a third-order nonlinearity compensation method using the superposition of electrical third-order harmonics. The measured spectrum consisted of only first-order modulation sidebands, which is equivalent to the ideal double-sideband suppressed-carrier modulation.

    AB - We analyzed the complex transfer function and modulation spectrum of the Mach-Zehnder (MZ) modulator with optical power and phase change imbalances. From the calculations, we found that the characteristic operation can be obtained in three cases: high extinction ratio, zero-chirp, and straight-line trajectory in the IQ plane. However, the results also indicate that we cannot achieve an operation equivalent to that of the ideal modulator, due to the small parasitic chirp in a single-drive modulator. To control the extinction ratio and chirp parameter individually, we propose an integrated modulator with some tunable Y-branches. By using the optical-power-imbalance tunable modulators, we experimentally demonstrate the characteristic operations and obtain the modulation spectrum equivalent to the ideal MZ modulator. However, compared to the ideal amplitude modulator, MZ modulators exhibit an intrinsic nonlinearity in the sinusoidal response. Therefore, we used a third-order nonlinearity compensation method using the superposition of electrical third-order harmonics. The measured spectrum consisted of only first-order modulation sidebands, which is equivalent to the ideal double-sideband suppressed-carrier modulation.

    KW - Amplitude modulation

    KW - Electro-optic modulators

    KW - Erbium

    KW - Intensity modulation

    KW - Interferometers

    KW - Optical device fabrication

    KW - Optical distortion

    KW - Optical fiber communication

    KW - Optical interferometry

    KW - Optical modulation

    KW - Optical modulation

    KW - Phase modulation

    UR - http://www.scopus.com/inward/record.url?scp=85030789567&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85030789567&partnerID=8YFLogxK

    U2 - 10.1109/JLT.2017.2758421

    DO - 10.1109/JLT.2017.2758421

    M3 - Article

    AN - SCOPUS:85030789567

    JO - Journal of Lightwave Technology

    JF - Journal of Lightwave Technology

    SN - 0733-8724

    ER -