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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 21 — Oct. 17, 2007
  • pp: 13519–13530

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, and A. K. Kar  »View Author Affiliations


Optics Express, Vol. 15, Issue 21, pp. 13519-13530 (2007)
http://dx.doi.org/10.1364/OE.15.013519


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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

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2410) Fiber optics and optical communications : Fibers, erbium
(230.7408) Optical devices : Wavelength filtering devices

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 13, 2007
Revised Manuscript: September 24, 2007
Manuscript Accepted: September 24, 2007
Published: October 1, 2007

Citation
R. K. Varshney, B. Nagaraju, A. Singh, B. P. Pal, and A. K. Kar, "Design and realization of an all-fiber broadband tunable gain equalization filter for DWDM signals," Opt. Express 15, 13519-13530 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-21-13519


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