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Applied Optics

Applied Optics


  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2174–2180

Theoretical analysis on the refractive-index distribution and bandwidth of gradient-index polymer optical fibers from a centrifugal field

Ming-Hsin Wei and Wen-Chang Chen  »View Author Affiliations

Applied Optics, Vol. 42, Issue 12, pp. 2174-2180 (2003)

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Theoretical analysis was applied to analyze the refractive-index distribution (RID) and bandwidth (BW) of gradient-index polymer optical fibers (GI POFs) prepared by a centrifugal field process. The RID of the prepared GI POF could be represented by the equation of n(r) = n1[1 - 2δ(r/ a) g ]1/2. The studied material systems were poly(hexafluoroisopropyl 2-fluoroacrylate) (PHFIP 2-FA)/dibutyl phthalate (DBP) and poly(methyl methacrylate) (PMMA)/benzyl benzoate (BEN). The RID and the BW were significantly affected by an essential parameter k, which was related to the material properties (density difference and molecular weight) and processing properties (rotating speed, temperature, and radius). As k increased, the characteristic constant of RID, g, decreased to a minimum and then increased sharply, owing to the separation of the polymer and the dopant. On the other hand, the relative refractive-index difference of RID, δ, increased to a steady value after k increased to a certain value. The variation of RID with k resulted in a local minimum of intermodal dispersion, and thus a maximum bandwidth was obtained. The maximum BW of the PHFIP 2-FA/DBP and PMMA/BEN systems at 1550 nm (100-m fiber length and 2-nm spectral width) for the case of k ≠ 0 were 6.7 and 3.2 Gb/s, respectively. The wavelength of light source affects the BW significantly only at k around zero because of the importance of the intramodal dispersion in this case.

© 2003 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2400) Fiber optics and optical communications : Fiber properties
(160.0160) Materials : Materials

Original Manuscript: May 14, 2002
Revised Manuscript: November 4, 2002
Published: April 20, 2003

Ming-Hsin Wei and Wen-Chang Chen, "Theoretical analysis on the refractive-index distribution and bandwidth of gradient-index polymer optical fibers from a centrifugal field," Appl. Opt. 42, 2174-2180 (2003)

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