EDFA gain flattening using phase-shifted long-period grating

Yinian Zhu, Ping Shum, Chao Lu, Beatrys M. Lacquet, Pieter L. Swart, Stephanus J. Spammer

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


The design of an erbium-doped fiber amplifier (EDFA) gain-flattening fiber filter, based on a cascade of phase-shifted long-period grating (LPG), and normal LPG, was presented. The phase-shifted LPG were written by using two kinds of techniques such that the amplitude mask technique and UV post-exposure technique. The results showed that the 3-dB bandwidth of the flattened EDFA was increased to 46 nm from 18 nm for an unequalized spectrum and the gain ripple over that bandwidth was reduced to 0.9 dB.
Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number2
Publication statusPublished - 20 Apr 2003
Externally publishedYes


  • EDFA
  • Fiber Bragg grating
  • Gain-flattening
  • Long-period grating
  • Phase-shift

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics


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