Fabrication and characterization of bandpass filters based on concatenated chirped fiber gratings

K. Sugden*, L. Zhang, J.A.R. Williams, R.W. Fallon, L.A. Everall, K.E. Chisholm, I Bennion

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Practical, low-loss (<2 dB), fiber Bragg grating single-passband transmission filters have been realized with >30 dB out-of-band rejection over ∼25 nm spectral widths. The approach adopted is based on the concatenation of two or more tailored broadband chirped gratings fabricated with low short-wavelength loss to maximize the rejection and stopband width in a filter with ∼1 nm passband. The effect of thermal aging for similar complex structures is considered in the context of three different fiber types: standard telecommunication, high germania(Ge)-doped and boron/germania(B/Ge)-codoped. It is shown that while hydrogenated B/Ge-codoped fiber exhibits excellent photosensitivity, the resulting decrease in guiding strength and thermal stability may make germania-doped fiber the more attractive choice.

Original languageEnglish
Pages (from-to)1424-1432
Number of pages9
JournalJournal of Lightwave Technology
Volume15
Issue number8
DOIs
Publication statusPublished - Aug 1997

Keywords

  • bandpass filters
  • broadband
  • chirped gratings
  • fiber Bragg gratings
  • thermal stability

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