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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 3 — Jan. 20, 2007
  • pp: 375–378

All-fiber dynamic gain equalizer based on a twisted long-period grating written by high-frequency CO2 laser pulses

T. Zhu, Y. J. Rao, and J. L. Wang  »View Author Affiliations


Applied Optics, Vol. 46, Issue 3, pp. 375-378 (2007)
http://dx.doi.org/10.1364/AO.46.000375


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Abstract

A novel dynamic gain equalizer for flattening Er-doped fiber amplifiers based on a twisted long-period fiber grating (LPFG) induced by high-frequency CO 2 laser pulses isreported for the first time to our knowledge. Experimental results show that its transverse-load sensitivity is up to 0.34 dB / ( g · mm 1 ) , while the twist ratio of the twisted LPFG is 20 rad / m , which is 7 times higher than that of a torsion-free LPFG. In addition, it is found that the strong orientation dependence of the transverse-load sensitivity of the torsion-free LPFGreported previously has been weakened considerably. Therefore such a dynamic gain equalizer based on the unique transverse-load characteristics of the twisted LPFG provides a much larger adjustable range and makes packaging of the gain equalizer much easier. A demonstration has been carried out to flatten an Er-doped fiber amplifier to ± 0.5 dB over a 32 nm bandwidth.

© 2007 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.1950) Optical devices : Diffraction gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: May 15, 2006
Manuscript Accepted: July 7, 2006
Published: January 4, 2007

Citation
T. Zhu, Y. J. Rao, and J. L. Wang, "All-fiber dynamic gain equalizer based on a twisted long-period grating written by high-frequency CO2 laser pulses," Appl. Opt. 46, 375-378 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-3-375


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References

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