Design and realization of an all-fiber broadband tunable gain equalization filter for DWDM signals

R. K. Varshney, B. Nagaraju, A. Singh, B. P. Pal, A. K. Kar

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Design and fabrication of a tunable gain equalization filter for dense wavelength division multiplexed (DWDM) signals through erbium doped fiber amplifiers (EDFA) is reported. It is based on a side-polished fiber (SPF) half-coupler block loaded with a displaceable tapered multimode overlay waveguide (MMOW). A simple and accurate normal mode analysis is employed to design this filtering device for its subsequent realization. Equalization of a typical EDFA gain spectrum in the C-band within ±0.35 dB or even less in the presence of various ITU standard C-band DWDM signal channels is demonstrated under varied operating conditions like add/drop of signals. Tunability of the filter notch is achieved through displacement of the SPF relative to the MMOW. © 2007 Optical Society of America.

Original languageEnglish
Pages (from-to)13519-13530
Number of pages12
JournalOptics Express
Volume15
Issue number21
DOIs
Publication statusPublished - 17 Oct 2007

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