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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 25, Iss. 6 — Jun. 1, 2007
  • pp: 1602–1612

Intermodulation Distortion Improvement for Fiber–Radio Applications Incorporating OSSB+C Modulation in an Optical Integrated-Access Environment

Christina Lim, Ampalavanapillai (Thas) Nirmalathas, Ka-Lun Lee, Dalma Novak, and Rod Waterhouse

Journal of Lightwave Technology, Vol. 25, Issue 6, pp. 1602-1612 (2007)

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In this paper, we investigate the reduction of intermodulation distortion (IMD) in fiber–radio systems incorporating a dispersion-tolerant optical single sideband with carrier modulation. We present a systematic analysis and quantification of the third-order IMD generated due to optical components in the nonlinear optical front-end. Our proposed technique to improve the optical front-end linearity is by the removal of the optical components that contribute most to the third-order IMD in the RF domain. We experimentally demonstrated the proposed technique with two- and three-tone tests and showed more than 9-dB improvement in the overall carrier-to-IMD ratio. The proposed technique was also investigated via simulation analysis for a larger number of radio channels and showed an IMD suppression of >10 dB. In addition, the proposed technique is not only able to improve the carrier-to-interference of the radio signals but also to enable simultaneous baseband transmission, thereby facilitating the merging of millimeter-wave fiber–radio systems with other wired-access infrastructure. We present a detailed investigation and characterization of this technique.

© 2007 IEEE

Christina Lim, Ampalavanapillai (Thas) Nirmalathas, Ka-Lun Lee, Dalma Novak, and Rod Waterhouse, "Intermodulation Distortion Improvement for Fiber–Radio Applications Incorporating OSSB+C Modulation in an Optical Integrated-Access Environment," J. Lightwave Technol. 25, 1602-1612 (2007)

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