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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 8 — Apr. 11, 2011
  • pp: 7742–7749

Design of all-normal dispersion microstructured optical fibers for pulse-preserving supercontinuum generation

Alexander Hartung, Alexander M. Heidt, and Hartmut Bartelt  »View Author Affiliations


Optics Express, Vol. 19, Issue 8, pp. 7742-7749 (2011)
http://dx.doi.org/10.1364/OE.19.007742


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Abstract

Recently, the generation of coherent, octave-spanning, and recompressible supercontinuum (SC) light has been demonstrated in optical fibers with all-normal group velocity dispersion (GVD) behavior by femtosecond pumping. In the normal dispersion regime, soliton dynamics are suppressed and the SC generation process is mainly due to self-phase modulation and optical wave breaking. This makes such white light sources suitable for time-resolved applications. The broadest spectra can be obtained when the pump wavelength equals the wavelength of maximum all-normal GVD. Therefore each available pump wavelength requires a specifically designed optical fiber with suitable GVD to unfold its full power. We investigate the possibilities to shift the all-normal maximum dispersion wavelength in microstructured optical fibers from the near infra red (NIR) to the ultra violet (UV). In general, a submicron guiding fiber core surrounded by a holey region is required to overcome the material dispersion of silica. Photonic crystal fibers (PCFs) with a hexagonal array of holes as well as suspended core fibers are simulated for this purpose over a wide field of parameters. The PCFs are varied concerning their air hole diameter and pitch and the suspended core fibers are varied concerning the number of supporting walls and the wall width. We show that these two fiber types complement each other well in their possible wavelength regions for all-normal GVD. While the PCFs are suitable for obtaining a maximum all-normal GVD in the NIR, suspended core fibers are well applicable in the visible wavelength range.

© 2011 OSA

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2400) Fiber optics and optical communications : Fiber properties
(060.4005) Fiber optics and optical communications : Microstructured fibers
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: February 24, 2011
Revised Manuscript: March 30, 2011
Manuscript Accepted: March 31, 2011
Published: April 6, 2011

Citation
Alexander Hartung, Alexander M. Heidt, and Hartmut Bartelt, "Design of all-normal dispersion microstructured optical fibers for pulse-preserving supercontinuum generation," Opt. Express 19, 7742-7749 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-8-7742


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