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Applied Optics

Applied 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)

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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

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

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)

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  1. K. Maru, K. Tanaka, T. Chiba, H. Nonen, and H. Uetsuka, "Dynamic gain equalizer using proposed adjustment procedure for thermo-optic phase shifters under the influence of thermal crosstalk," J. Lightwave Technol. 22, 1523-1532 (2004). [CrossRef]
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  6. Y. J. Rao, T. Zhu, and Z. L. Ran, "An all-fiber dynamic gain equalizer based on a novel long period fiber grating written by high-frequency CO2 laser pulses," Chin. Phys. Lett. 19, 1822-1824 (2002). [CrossRef]
  7. Y. P. Wang, Y. J. Rao, Z. L. Ran , T. Zhu, and A. Z. Hu, "A novel tunable gain equalizer based on a long period fiber grating written by high-frequency CO2 laser pulses," IEEE Photon. Technol. Lett. 15, 251-253 (2003). [CrossRef]
  8. Y. J. Rao, A. Z. Hu, and Y. C. Niu, "A novel dynamic LPFG gain equalizer written in a bend-insensitive fiber," Opt. Commun. 244, 137-140 (2005). [CrossRef]

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