Transmission performance of 10-Gb/s optical duobinary transmission systems considering adjustable chirp of nonideal LiNbO3 mach-zehnder modulators due to applied voltage ratio and filter bandwidth

Sung Kee Kim, Jaehoon Lee, Jichai Jeong

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    We investigate interplay between the residual and applied chirp of optical duobinary modulated signals in order to improve transmission performance. To find the best performance for 10-Gb/s optical duobinary transmission systems, we consider the residual chirp accompanying from the finite extinction ratio, the applied chirp adjusted by the applied voltage ratio (the chirp parameter) between two electrodes of LiNbO3 modulators, and the bandwidth of electrical low-pass filters used in duobinary transmitters. The simulation results suggest that nearly zero chirp during the mark ('1') period and large peak chirp at the middle of the space ('0') provide the best transmission performance. This zero chirp around marks and high peak chirp at the middle of each space can be controlled by the applied voltage ratio between two electrodes of modulator and the filter bandwidth, respectively.

    Original languageEnglish
    Pages (from-to)465-470
    Number of pages6
    JournalJournal of Lightwave Technology
    Volume19
    Issue number4
    DOIs
    Publication statusPublished - 2001 Apr

    Bibliographical note

    Funding Information:
    Manuscript received February 15, 2000; revised January 3, 2001. This work was supported by Korea University and the University Research Program of the Ministry of Information & Communication, South Korea. The authors are with the Department of Radio Engineering, Korea University, Seoul 136-701 Korea. Publisher Item Identifier S 0733-8724(01)02750-5.

    Keywords

    • Chirp modulation
    • Duobinary modulation
    • Optical communication
    • Propagating in dispersive media

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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