Tunable dispersion slope compensation for 40-Gb/s WDM systems using broadband nonchannelized third-order chirped fiber Bragg gratings

Y. W. Song, Z. Pan, S. M.R. Motaghian Nezam, Changyuan Yu, Y. Wang, D. Starodubov, V. Grubsky, J. E. Rothenberg, J. Popelek, H. Li, Y. Li, R. Caldwell, R. Wilcox, Alan Eli Willner

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


We demonstrate tunable dispersion slope compensation using broadband nonchannelized third-order chirped fiber Bragg gratings (FBGs) for 40-Gb/s wavelength-division-multiplexed (WDM) systems. The slope is tuned by stretching as it has a third-order time delay variation with wavelength, and thus a second-order dispersion-wavelength curve. Calculation results include the examples of the slope tuning in addition to the interchannel dispersion differences and the slope tuning ranges with respect to the wavelength in a single grating. To verify the functionality of the third-order grating, we prepare a third-order grating with a dispersion variation of up to 400 ps/nm over the 3.5-nm usable bandwidth, and a dispersion slope tuning range of ∼65 ps/nm2is achieved. For 40-Gb/s systems, two new gratings are designed and inversely cascaded to eliminate the inherent errors originating from the deleterious higher-order dispersion components in a single grating. The slope tuning range is -20 to +20 ps/nm2over the 5-nm usable bandwidth. A ∼10-dB power penalty improvement is achieved and the BER floor is eliminated for the worst-case channel after transmission through a 170-km link using dispersion shifted fiber (DSF) with a 4 × 40-Gb/s RZ data stream.
Original languageEnglish
Pages (from-to)2259-2266
Number of pages8
JournalJournal of Lightwave Technology
Issue number12
Publication statusPublished - 1 Dec 2002
Externally publishedYes


  • Broadband grating
  • Optical fiber communications
  • Third-order fiber Bragg grating
  • Tunable dispersion slope compensation
  • Wavelength-division-multiplexed (WDM) system

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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