Direct design of high channel-count fiber Bragg grating filters with low index modulation

Hui Cao*, Javid Atai, Xuewen Shu, Guojie Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A novel method for designing high channel-count fiber Bragg gratings (FBGs) is proposed. For the first time, tailored group delay is introduced into the target reflection spectra to obtain a more even distribution of the refractive index modulation. This approach results in the reduction of the maximum refractive index modulation to physically realizable levels. The maximum index modulation reduction factors are all greater than 5.5. This is a significant improvement compared with previously reported results. Numerical results show that the thus designed high channel-count FBG filters exhibit superior characteristics including 30 dB channel isolation, a flat-top and near 100% reflectivity in each channel.

Original languageEnglish
Pages (from-to)12095-12110
Number of pages16
JournalOptics Express
Volume20
Issue number11
Early online date11 May 2012
DOIs
Publication statusPublished - 21 May 2012

Keywords

  • fiber Bragg gratings
  • wavelength filtering devices
  • optical communications

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