Abstract

Hole-assisted lightguide fiber (HALF) is a microstructured fiber comprising a material index profile for waveguiding and air holes for modifying optical properties. Anomalous dispersion larger than those of the conventional fibers can be realized without severe degradation in optical loss, because of low power fraction in the holes and structural simplicity. We investigate into the causes of the loss of the fabricated HALFs, and show that a GeO2-doped core, in addition to the low power fraction, is desirable for low loss. The fabricated HALF exhibits a loss as low as 0.41 dB/km and a large anomalous dispersion of +35 ps/nm/km at 1550 nm wavelength.

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References

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  1. T. A. Birks, J. C. Knight, B. J. Mangan, and P. St. J. Russell, "Photonic crystal fibres : an endless variety," IEICE Trans. Electron. E84-C, 585-592, (2001).
  2. D. J. Richardson, T. M. Monro, and N. G. R. Broderick, "Holey fibres - a review of recent developments in theory, fabrication and experiment," ECOC2000 4, 37-40, (2000).
  3. D. C. Allan, N. F. Borrelli, J. C. Fajardo, R. M. Fiacco, D. W. Hawtof, and J. A. West, International patent application WO 00/37974, (2000).
  4. H. Kubota, K. Suzuki, S. Kawanishi, M. Nakazawa, M. Tanaka, and M. Fujita, "Low-loss, 2km-long photonic crystal fiber with zero GVD in the near IR suitable for picosecond pulse propagation at the 800 nm band," CLEO 2001, (Optical Society of America, Washington, D.C., 2001) CPD3.
  5. J. A. West, N. Venkataramam, C. M. Smith, and M. T. Gallagher, "Photonic crystal fibers," ECOC2001, Th.A.2.2, (2001).
  6. T. Hasegawa, E. Sasaoka, M. Onishi, M. Nishimura, Y. Tsuji, and M. Koshiba, "Novel hole-assisted lightguide fiber exhibiting large anomalous dispersion and low loss below 1 dB/km," OFC 2001, (Optical Society of America, Washington, D.C., 2001) PD5.
  7. T. Hasegawa, E. Sasaoka, M. Onishi, M. Nishimura, Y. Tsuji, and M. Koshiba, "Modeling and design optimization of hole-assisted lightguide fiber by full-vector finite element method," ECOC2001, We.L.2.5, (2001).
  8. S. S. Walker, "Rapid modeling and estimation of total spectral loss in optical fibers," J. Lightwave Technol. 4, 1125-1131, (1986).
    [CrossRef]
  9. K. M. Davis and M. Tomozawa, "An infrared spectroscopic study of water-related species in silica glasses," J. Non-Cryst. Solid. 201, 177-198, (1996).
    [CrossRef]
  10. M. Bredol, D. Leers, L. Bosselaar, and M. Hutjens, "Improved model for OH absorption in optical fibers," J. Lightwave Technol. 8, 1536-1540, (1990).
    [CrossRef]
  11. M. Ohashi, K. Shiraki, and K. Tajima, "Optical loss property of silica-based single-mode fibers," J. Lightwave Technol. 10, 539-543, (1992).
    [CrossRef]

Other

T. A. Birks, J. C. Knight, B. J. Mangan, and P. St. J. Russell, "Photonic crystal fibres : an endless variety," IEICE Trans. Electron. E84-C, 585-592, (2001).

D. J. Richardson, T. M. Monro, and N. G. R. Broderick, "Holey fibres - a review of recent developments in theory, fabrication and experiment," ECOC2000 4, 37-40, (2000).

D. C. Allan, N. F. Borrelli, J. C. Fajardo, R. M. Fiacco, D. W. Hawtof, and J. A. West, International patent application WO 00/37974, (2000).

H. Kubota, K. Suzuki, S. Kawanishi, M. Nakazawa, M. Tanaka, and M. Fujita, "Low-loss, 2km-long photonic crystal fiber with zero GVD in the near IR suitable for picosecond pulse propagation at the 800 nm band," CLEO 2001, (Optical Society of America, Washington, D.C., 2001) CPD3.

J. A. West, N. Venkataramam, C. M. Smith, and M. T. Gallagher, "Photonic crystal fibers," ECOC2001, Th.A.2.2, (2001).

T. Hasegawa, E. Sasaoka, M. Onishi, M. Nishimura, Y. Tsuji, and M. Koshiba, "Novel hole-assisted lightguide fiber exhibiting large anomalous dispersion and low loss below 1 dB/km," OFC 2001, (Optical Society of America, Washington, D.C., 2001) PD5.

T. Hasegawa, E. Sasaoka, M. Onishi, M. Nishimura, Y. Tsuji, and M. Koshiba, "Modeling and design optimization of hole-assisted lightguide fiber by full-vector finite element method," ECOC2001, We.L.2.5, (2001).

S. S. Walker, "Rapid modeling and estimation of total spectral loss in optical fibers," J. Lightwave Technol. 4, 1125-1131, (1986).
[CrossRef]

K. M. Davis and M. Tomozawa, "An infrared spectroscopic study of water-related species in silica glasses," J. Non-Cryst. Solid. 201, 177-198, (1996).
[CrossRef]

M. Bredol, D. Leers, L. Bosselaar, and M. Hutjens, "Improved model for OH absorption in optical fibers," J. Lightwave Technol. 8, 1536-1540, (1990).
[CrossRef]

M. Ohashi, K. Shiraki, and K. Tajima, "Optical loss property of silica-based single-mode fibers," J. Lightwave Technol. 10, 539-543, (1992).
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

Schematic structure of hole-assisted lightguide fiber (HALF).

Fig. 2.
Fig. 2.

Dependence of properties of HALF on its structure. (a-c) : Structures for calculation. The relationships of (d) dispersion and (e) relative dispersion slope (RDS) to effective area. The calculation is performed with varying the dimensions within the range of single-mode operation. The left and right ends of the plots are the limits posed by the macrobend loss and the higher-order mode cut-off, respectively.

Fig. 3.
Fig. 3.

Structures of the fabricated HALFs.

Fig. 4.
Fig. 4.

Dependence of loss on core-cladding materials. Fiber (1): pure silica core, (2): GeO2-doped core.

Fig. 5.
Fig. 5.

Dependence of loss on the hole shape. Fiber (2): small holes, Fiber (3): large holes.

Tables (2)

Tables Icon

Table 1: Summary of the fabricated fibers.

Tables Icon

Table 2: Parameters for loss modeling [8].

Equations (2)

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α ( λ ) = A λ 4 + B + α OH ( λ ) ,
α OH ( λ ) = Δ α OH · n = 1 6 a n exp [ 1 2 ( λ λ n σ n ) 2 ] ,

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