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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21608–21614
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Fabrication and characterization of a chalcogenide-tellurite composite microstructure fiber with high nonlinearity

Meisong Liao, Chitrarekha Chaudhari, Guanshi Qin, Xin Yan, Chihiro Kito, Takenobu Suzuki, Yasutake Ohishi, Morio Matsumoto, and Takashi Misumi  »View Author Affiliations


Optics Express, Vol. 17, Issue 24, pp. 21608-21614 (2009)
http://dx.doi.org/10.1364/OE.17.021608


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Abstract

A highly nonlinear composite fiber, which has a 1.5 μm chalcogenide glass core surrounded by a tellurite glass microstructure cladding, has been fabricated by the method of stack and draw. A tellurite glass capillary containing a As2S3 rod was sealed with negative pressure inside. Then this capillary and other empty capillaries were stacked into a tellurite glass tube, and elongated into a cane. This cane was then inserted into another tellurite glass jacket tube and drawn into the composite microstructure fiber. The fiber has a flattened chromatic dispersion together with a zero dispersion wavelength located in the near infrared range. The propagation losses at 1.55 μm were 18.3 dB/m. The nonlinear coefficient at 1.55 μm was 9.3 m−1W−1. Such a high nonlinear coefficient counteracts the high propagation losses to a large extent. A supercontinuum spectrum of 20-dB bandwidth covering 800-2400 nm was generated by this composite microstructure fiber.

© 2009 OSA

1. Introduction

2. Fabrication

The composition of the tellurite glass was 76.5TeO2-6Bi2O3-11.5Li2O-6ZnO (mol%), which was the same as that of the tellurite glass in Ref. 13

13. C. Chaudhari, T. Suzuki, and Y. Ohishi, “Chalcogenide core photonic crystal fibers for zero chromatic dispersion in the C-Band,” OFC San Diego, 22–26 March 2009, OTuC4 (2009).

. The transition temperature was 275 °C. Both tubes and capillaries were made from this glass. The raw materials were analytic grade. The tellurite glass tubes were prepared by rotational casting method. The tellurite glass capillaries were fabricated by elongating the tellurite tube. An As2S3 glass rod with a diameter of 1 mm, which was prepared by elongating the As2S3 glass rod with a larger diameter, was inserted into a capillary. Then the capillary was sealed with the negative pressure of 90 kPa inside. The capillary containing the As2S3 rod together with other empty capillaries was stacked into a tellurite glass tube. The capillary containing As2S3 rod was at the center surrounded by other capillaries. The stacked tube was elongated to the cane at 290 °C. Then the cane was inserted into another jacket tube of tellurite glass and drawn into fiber at 290 °C. The jacket tube was utilized to decrease the ratio of the core to cladding size. The length of the preform (namely jacket tube with cane inside) was 14 cm. The fiber-drawing speed was 2.0 m/min. A schematic diagram for the fabrication of cane is shown in Fig. 1
Fig. 1 Schematic diagram for the fabrication of the cane: a. As2S3 glass rod with larger diameter, b. elongated As2S3 glass rods, c. tellurite capillary to hold the As2S3 glass rod, d. tellurite capillaries for the holes in the cladding of the fiber, e. tellurite capillary with As2S3 glass rod inside, f. tellurite tube to be stacked with capillaries, g. cane, h. enlarged cross section of the cane.
. The cross section of the composite microstructure fiber is shown in Fig. 2
Fig. 2 Scanning electron microscope image of the cross section of the As2S3-tellurite composite microstructure fiber.
. The fiber has an outside diameter of 120 μm. The diameters of the As2S3 glass core, inner holes, and outer holes are 1.5 μm, 1.6-2.2 μm, 2.1-2.8 μm, respectively. The radius of the ring of outer holes (from the centre of the As2S3 core to the centre of the hole) is 4.6 μm, and for the inner ring is 3.1 μm.

3. Characterization

The propagation losses of the fiber at 1550 nm were resolved by the method of cut back. Both ends of the composite fiber were checked by using an optical microscope to make sure of good quality of the cross section. A single frequency CW laser was coupled into the fiber by a 20×0.25 NA aspheric lens. The coupling efficiency was around 10%. The signal was launched into a single mode fiber (SMF) by the method of butt joint. The SMF was connected with optical spectrum analyser (OSA, Yokogawa AQ6375, Japan). The optical losses (αdB) were 18.3 dB/m. At longer wavelengths around 2 or 3 μm, because of impurities such as hydroxyl groups, the loss should be higher than this value. The optical losses of a microstructure fiber are composed of the scattering loss, the imperfection loss, the ultraviolet and infrared absorption loss, the confinement loss and the absorption loss of other impurities. The confinement loss of the fundamental mode was calculated using finite element method (By the software of FemSIM 1.0, RSoft Design Group, Inc.). The Sellmeier coefficients of the As2S3 glass and tellurite glass were introduced in Ref. 13

13. C. Chaudhari, T. Suzuki, and Y. Ohishi, “Chalcogenide core photonic crystal fibers for zero chromatic dispersion in the C-Band,” OFC San Diego, 22–26 March 2009, OTuC4 (2009).

. The refractive indices at 1.55 μm are 2.437 for the As2S3 glass and 2.005 for the tellurite glass. The confinement loss spectrum is shown in Fig. 3
Fig. 3 Calculated confinement loss of the fundamental mode for the As2S3-tellurite composite microstructure fiber.
. The confinement loss is almost zero before 4.2 μm, and then increases sharply with increasing of wavelength. At 1.55 μm the material losses of the As2S3 glass and tellurite glass are less than 1 dB/m. Therefore, the measured losses are mainly derived from the scattering loss and imperfection loss [14

14. L. Brilland, J. Troles, P. Houizot, F. Désévédavy, Q. Coulombier, G. Renversez, T. Chartier, T. N. Nguyen, J. L. Adam, and N. Traynor, “Interfaces impact on the transmission of chalcogenides photonic crystal fibres,” J. Ceram. Soc. Jpn. 116(1358), 1024–1027 ( 2008). [CrossRef]

]. Because the As2S3 glass has an expansion coefficient higher than that of tellurite glass, by further optimization of the match of expansion coefficient the scattering loss should be decreased to a certain extent. The imperfection loss mainly comes from the imperfection of the interface between core and cladding. Since the As2S3 glass has a soft temperature lower than that of tellurite glass, the imperfection loss can be decreased by decreasing the soft temperature of the tellurite glass. Tellurite glass with higher expansion coefficient and lower soft temperature is under further development.

The chromatic dispersion of the fundamental mode was calculated using finite element method (By the software of FemSIM 1.0, RSoft Design Group, Inc.). The simulation was based on the scanning electron microscope image. The chromatic dispersion curve is shown in Fig. 4
Fig. 4 Chromatic dispersion of the fundamental mode in the As2S3-tellurite composite microstructure fiber and the calculated mode field (inset a) of the fundamental mode at 1550 nm. The chromatic dispersion of the fundamental mode in a step-index air-clad As2S3 glass fiber with the core diameter of 1.5 μm is shown for comparison.
. The chromatic dispersion curve has three ZDWs at 1.65 μm, 2.36 μm, 4.16 μm respectively. It is characterized with a comparatively flattened chromatic dispersion with two close ZDWs and a convex profile from 1.5 μm to 2.5 μm, which is of significance for the generation of SC with flatness and stability [20

20. G. Genty, S. Coen, and J. M. Dudley, “Fiber supercontinuum sources (Invited),” J. Opt. Soc. Am. B 24(8), 1771–1785 ( 2007). [CrossRef]

,21

21. K. M. Hilligsøe, T. V. Andersen, H. N. Paulsen, C. K. Nielsen, K. Mølmer, S. Keiding, R. Kristiansen, K. Hansen, and J. Larsen, “Supercontinuum generation in a photonic crystal fiber with two zero dispersion wavelengths,” Opt. Express 12(6), 1045–1054 ( 2004). [CrossRef] [PubMed]

]. The chromatic dispersion of a step-index air-clad As2S3 glass fiber with the core diameter of 1.5 μm was calculated likewise and shown in Fig. 4 for comparison. The third order dispersions at the shortest ZDW are 0.559 ps/(nm2×km) for the composite microstructure fiber, and 1.258 ps/(nm2×km) for the air-clad fiber, respectively. On the whole the composite microstructure fiber has a much flatter dispersion than that of the air-clad fiber from around 1.5 μm to 2.5 μm. The nonlinear coefficient was calculated by:
γ=2πλn2(x,y)|F(x,y)|4dxdy(|F(x,y)|2dxdy)2,
where F(x,y) is the profile of the field, n2 is the nonlinear refractive index, n2 of As2S3 glass is 3×10−18 m2/w [22

22. M. R. E. Lamont, B. Luther-Davies, D. Y. Choi, S. Madden, and B. J. Eggleton, “Supercontinuum generation in dispersion engineered highly nonlinear (γ = 10 /W/m) As2S3) chalcogenide planar waveguide,” Opt. Express 16(19), 14938–14944 ( 2008). [CrossRef] [PubMed]

]. n2 of this tellurite glass is 5.9×10−19 m2/w. According to the simulation for dispersion calculation, the fiber is not a single mode waveguide at 1.55 μm. The calculated mode field of the fundamental mode at 1.55 μm was shown in inset a of Fig. 4. The calculated mode field diameter was 1.3 μm. γ at 1.55 μm was 9.3 m−1W−1. It is about 9300 times the γ of standard SMF28 fiber [23

23. V. Finazzi, T. M. Monro, and D. J. Richardson, “Small-core silica holey fibers: nonlinearity and confinement loss trade-offs,” J. Opt. Soc. Am. B 20(7), 1427–1436 ( 2003). [CrossRef]

]. Such a high nonlinear coefficient counteracts the disadvantage of high optical losses to a large extent. Under a given pump condition, for the highly nonlinear fiber the nonlinear phase shift is resolved by the figure-of-merit (FOM) γ×L eff [5

5. H. Ebendorff-Heidepriem, P. Petropoulos, S. Asimakis, V. Finazzi, R. C. Moore, K. Frampton, F. Koizumi, D. J. Richardson, and T. M. Monro, “Bismuth glass holey fibers with high nonlinearity,” Opt. Express 12(21), 5082–5087 ( 2004). [CrossRef] [PubMed]

]. L eff is the effective length of fiber. L eff=[1-exp(-α×L)]/α, where α represents the optical losses. α=αdB/4.343. The maximum of L eff is the reciprocal of α. In Table 1

Table 1. Nonlinear coefficient γ, maximum effective fiber length Leff-max, figure of merit γ×Leff-max, effective fiber length of 1 cm fiber Leff-1cm, and figure of merit γ×Leff-1cm for various highly nonlinear fibers (HF).

table-icon
View This Table
the FOMs of various highly nonlinear fibers are compared. For the maximum FOMs of all fibers, the composite microstructure fiber does not show obvious advantage, but for all fibers in the length of 1 cm, the advantage is obvious.

A 1 cm long fiber was picked out to conduct the SC experiment. Both ends of it were cleaved using a diamond stylus. The pump laser for the composite fiber is a femtosecond laser system which is composed of a TOPAS laser and a Ti:sapphire pump laser. The output pulse of the femtosecond laser system has a width of 180 fs and a repetition rate of 1 kHz. This output pulse was attenuated by an attenuation filter with optical density of 2.0, and then coupled into the composite fiber by using a 20×0.25 NA aspheric lens. The coupling efficiency was around 10%. The pulse was expanded to 400 fs after passing through the aspheric lens, because it had a hyperbolic secant field profile. The output end of the composite fiber was mechanically spliced with a silica fiber cable with large effective mode field by using a butt-joint method. The other end of the fiber cable was connected to the OSA (Agilent 86142B, USA, measurement range: 600-1700 nm; Yokogawa AQ6375, Japan, measurement range: 1200-2400 nm). Figure 5
Fig. 5 Supercontinuum spectrum from the As2S3-tellurite composite microstructure fiber pumped by a 1.85 μm femtosecond laser.
shows the SC spectrum. The pump wavelength for the SC spectrum is 1.85 μm. The integration of the power of SC spectrum was divided by the pump pulse width and frequency. In this way the peak power of the launched pulse was estimated to be in the magnitude of ten thousand watt. A supercontinuum spectrum of 20-dB bandwidth covering 800-2400 nm was obtained. There is an obvious decrease around 2300 nm in the SC spectrum. This is attributed to that the loss of large mode silica fiber which increases after this wavelength.

4. Summary

In summary, for the first time, a highly nonlinear chalcogenide-tellurite composite microstructure fiber has been fabricated by the method of stack and draw. The fiber has a 1.5 μm chalcogenide core surrounded by a tellurite microstructure cladding. It has a comparative flat chromatic dispersion with two ZDWs and a convex profile from 1.5 μm to 2.5 μm. The nonlinear coefficient is 9.3 m−1W−1 at 1.55 μm. The high nonlinear coefficient counteracts the disadvantage of the high optical losses to a large extent. It will find applications in compact nonlinear devices, and devices which work in the mid-infrared range.

Acknowledgement

The authors appreciate Dr. Mark Hughes for his helpful discussion. This work was supported by MEXT, the Private University High-Tech Research Center Program (2006-2010).

References and links

1.

Y. S. Kivshar, “Nonlinear optics: the next decade,” Opt. Express 16(26), 22126–22128 ( 2008). [CrossRef] [PubMed]

2.

V. V. Kumar, A. K. George, W. H. Reeves, J. C. Knight, P. Russell, F. Omenetto, and A. Taylor, “Extruded soft glass photonic crystal fiber for ultrabroad supercontinuum generation,” Opt. Express 10(25), 1520–1525 ( 2002). [PubMed]

3.

J. K. Ranka, R. S. Windeler, and A. J. Stentz, “Visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm,” Opt. Lett. 25(1), 25–27 ( 2000). [CrossRef] [PubMed]

4.

P. Petropoulos, H. Ebendorff-Heidepriem, V. Finazzi, R. C. Moore, K. Frampton, D. J. Richardson, and T. M. Monro, “Highly nonlinear and anomalously dispersive lead silicate glass holey fibers,” Opt. Express 11(26), 3568–3573 ( 2003). [CrossRef] [PubMed]

5.

H. Ebendorff-Heidepriem, P. Petropoulos, S. Asimakis, V. Finazzi, R. C. Moore, K. Frampton, F. Koizumi, D. J. Richardson, and T. M. Monro, “Bismuth glass holey fibers with high nonlinearity,” Opt. Express 12(21), 5082–5087 ( 2004). [CrossRef] [PubMed]

6.

M. Liao, C. Chaudhari, G. Qin, X. Yan, T. Suzuki, and Y. Ohishi, “Tellurite microstructure fibers with small hexagonal core for supercontinuum generation,” Opt. Express 17(14), 12174–12182 ( 2009). [CrossRef] [PubMed]

7.

M. Liao, X. Yan, G. Qin, C. Chaudhari, T. Suzuki, and Y. Ohishi, “A highly non-linear tellurite microstructure fiber with multi-ring holes for supercontinuum generation,” Opt. Express 17(18), 15481–15490 ( 2009). [CrossRef] [PubMed]

8.

L. Brilland, F. Smektala, G. Renversez, T. Chartier, J. Troles, T. N. Nguyen, N. Traynor, and A. Monteville, “Fabrication of complex structures of Holey Fibers in Chalcogenide glass,” Opt. Express 14(3), 1280–1285 ( 2006). [CrossRef] [PubMed]

9.

F. Désévédavy, G. Renversez, L. Brilland, P. Houizot, J. Troles, Q. Coulombier, F. Smektala, N. Traynor, and J. L. Adam, “Small-core chalcogenide microstructured fibers for the infrared,” Appl. Opt. 47(32), 6014–6021 ( 2008). [CrossRef] [PubMed]

10.

J. Hu, C. R. Menyuk, L. B. Shaw, J. S. Sanghera, and I. D. Aggarwal, “Supercontinuum generation in an As2Se3-based chalcogenide PCF using four-wave mixing and soliton self-frequency Shift,” OFC San Diego, 22–27 March 2009, OWU6 (2009).

11.

D. I. Yeom, E. C. Mägi, M. R. Lamont, M. A. Roelens, L. Fu, and B. J. Eggleton, “Low-threshold supercontinuum generation in highly nonlinear chalcogenide nanowires,” Opt. Lett. 33(7), 660–662 ( 2008). [CrossRef] [PubMed]

12.

C. M. B. Cordeiro, W. J. Wadsworth, T. A. Birks, and P. St. J. Russell, “Engineering the dispersion of tapered fibers for supercontinuum generation with a 1064 nm pump laser,” Opt. Lett. 30(15), 1980–1982 ( 2005). [CrossRef] [PubMed]

13.

C. Chaudhari, T. Suzuki, and Y. Ohishi, “Chalcogenide core photonic crystal fibers for zero chromatic dispersion in the C-Band,” OFC San Diego, 22–26 March 2009, OTuC4 (2009).

14.

L. Brilland, J. Troles, P. Houizot, F. Désévédavy, Q. Coulombier, G. Renversez, T. Chartier, T. N. Nguyen, J. L. Adam, and N. Traynor, “Interfaces impact on the transmission of chalcogenides photonic crystal fibres,” J. Ceram. Soc. Jpn. 116(1358), 1024–1027 ( 2008). [CrossRef]

15.

W. Q. Zhang, V. S. Afshar, H. Ebendorff-Heidepriem, and T. M. Monro, “Record nonlinearity in optical fibre,” Electron. Lett. 44(25), 1453 ( 2008). [CrossRef]

16.

N. Sugimoto, T. Nagashima, T. Hasegawa, S. Ohara, K. Taira, and K. Kikuchi, OFC Los Angeles, 22–27 February 2004, PDP26 (2004).

17.

A. Mori, K. Shikano, W. Enbutsu, K. Oikawa, K. Naganuma, M. Kato, and S. Aozasa, ECOC Stockholm, 5–9 September 2004, Th3.3.6 (2004).

18.

J. H. Lee, W. Belardi, K. Furusawa, P. Petropoulos, Z. Yusoff, T. M. Monro, and D. J. Richardson, “Four-wave mixing based 10-Gbit/s tunable wavelength conversion using a holey fiber with a high SBS threshold,” IEEE Photon. Technol. Lett. 15(3), 440–442 ( 2003). [CrossRef]

19.

K. Kikuchi, K. Taira, and N. Sugimoto, “Highly nonlinear bismuth oxide-based glass fibres for all-optical signal processing,” Electron. Lett. 38(4), 166–167 ( 2002). [CrossRef]

20.

G. Genty, S. Coen, and J. M. Dudley, “Fiber supercontinuum sources (Invited),” J. Opt. Soc. Am. B 24(8), 1771–1785 ( 2007). [CrossRef]

21.

K. M. Hilligsøe, T. V. Andersen, H. N. Paulsen, C. K. Nielsen, K. Mølmer, S. Keiding, R. Kristiansen, K. Hansen, and J. Larsen, “Supercontinuum generation in a photonic crystal fiber with two zero dispersion wavelengths,” Opt. Express 12(6), 1045–1054 ( 2004). [CrossRef] [PubMed]

22.

M. R. E. Lamont, B. Luther-Davies, D. Y. Choi, S. Madden, and B. J. Eggleton, “Supercontinuum generation in dispersion engineered highly nonlinear (γ = 10 /W/m) As2S3) chalcogenide planar waveguide,” Opt. Express 16(19), 14938–14944 ( 2008). [CrossRef] [PubMed]

23.

V. Finazzi, T. M. Monro, and D. J. Richardson, “Small-core silica holey fibers: nonlinearity and confinement loss trade-offs,” J. Opt. Soc. Am. B 20(7), 1427–1436 ( 2003). [CrossRef]

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(190.0190) Nonlinear optics : Nonlinear optics
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 10, 2009
Revised Manuscript: October 19, 2009
Manuscript Accepted: October 21, 2009
Published: November 11, 2009

Citation
Meisong Liao, Chitrarekha Chaudhari, Guanshi Qin, Xin Yan, Chihiro Kito, Takenobu Suzuki, Yasutake Ohishi, Morio Matsumoto, and Takashi Misumi, "Fabrication and characterization of a chalcogenide-tellurite composite microstructure fiber with high nonlinearity," Opt. Express 17, 21608-21614 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-24-21608


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References

  1. Y. S. Kivshar, “Nonlinear optics: the next decade,” Opt. Express 16(26), 22126–22128 (2008). [CrossRef] [PubMed]
  2. V. V. Kumar, A. K. George, W. H. Reeves, J. C. Knight, P. Russell, F. Omenetto, and A. Taylor, “Extruded soft glass photonic crystal fiber for ultrabroad supercontinuum generation,” Opt. Express 10(25), 1520–1525 (2002). [PubMed]
  3. J. K. Ranka, R. S. Windeler, and A. J. Stentz, “Visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm,” Opt. Lett. 25(1), 25–27 (2000). [CrossRef] [PubMed]
  4. P. Petropoulos, H. Ebendorff-Heidepriem, V. Finazzi, R. C. Moore, K. Frampton, D. J. Richardson, and T. M. Monro, “Highly nonlinear and anomalously dispersive lead silicate glass holey fibers,” Opt. Express 11(26), 3568–3573 (2003). [CrossRef] [PubMed]
  5. H. Ebendorff-Heidepriem, P. Petropoulos, S. Asimakis, V. Finazzi, R. C. Moore, K. Frampton, F. Koizumi, D. J. Richardson, and T. M. Monro, “Bismuth glass holey fibers with high nonlinearity,” Opt. Express 12(21), 5082–5087 (2004). [CrossRef] [PubMed]
  6. M. Liao, C. Chaudhari, G. Qin, X. Yan, T. Suzuki, and Y. Ohishi, “Tellurite microstructure fibers with small hexagonal core for supercontinuum generation,” Opt. Express 17(14), 12174–12182 (2009). [CrossRef] [PubMed]
  7. M. Liao, X. Yan, G. Qin, C. Chaudhari, T. Suzuki, and Y. Ohishi, “A highly non-linear tellurite microstructure fiber with multi-ring holes for supercontinuum generation,” Opt. Express 17(18), 15481–15490 (2009). [CrossRef] [PubMed]
  8. L. Brilland, F. Smektala, G. Renversez, T. Chartier, J. Troles, T. N. Nguyen, N. Traynor, and A. Monteville, “Fabrication of complex structures of Holey Fibers in Chalcogenide glass,” Opt. Express 14(3), 1280–1285 (2006). [CrossRef] [PubMed]
  9. F. Désévédavy, G. Renversez, L. Brilland, P. Houizot, J. Troles, Q. Coulombier, F. Smektala, N. Traynor, and J. L. Adam, “Small-core chalcogenide microstructured fibers for the infrared,” Appl. Opt. 47(32), 6014–6021 (2008). [CrossRef] [PubMed]
  10. J. Hu, C. R. Menyuk, L. B. Shaw, J. S. Sanghera, and I. D. Aggarwal, “Supercontinuum generation in an As2Se3-based chalcogenide PCF using four-wave mixing and soliton self-frequency Shift,” OFC San Diego, 22–27 March 2009, OWU6 (2009).
  11. D. I. Yeom, E. C. Mägi, M. R. Lamont, M. A. Roelens, L. Fu, and B. J. Eggleton, “Low-threshold supercontinuum generation in highly nonlinear chalcogenide nanowires,” Opt. Lett. 33(7), 660–662 (2008). [CrossRef] [PubMed]
  12. C. M. B. Cordeiro, W. J. Wadsworth, T. A. Birks, and P. St. J. Russell, “Engineering the dispersion of tapered fibers for supercontinuum generation with a 1064 nm pump laser,” Opt. Lett. 30(15), 1980–1982 (2005). [CrossRef] [PubMed]
  13. C. Chaudhari, T. Suzuki, and Y. Ohishi, “Chalcogenide core photonic crystal fibers for zero chromatic dispersion in the C-Band,” OFC San Diego, 22–26 March 2009, OTuC4 (2009).
  14. L. Brilland, J. Troles, P. Houizot, F. Désévédavy, Q. Coulombier, G. Renversez, T. Chartier, T. N. Nguyen, J. L. Adam, and N. Traynor, “Interfaces impact on the transmission of chalcogenides photonic crystal fibres,” J. Ceram. Soc. Jpn. 116(1358), 1024–1027 (2008). [CrossRef]
  15. W. Q. Zhang, V. S. Afshar, H. Ebendorff-Heidepriem, and T. M. Monro, “Record nonlinearity in optical fibre,” Electron. Lett. 44(25), 1453 (2008). [CrossRef]
  16. N. Sugimoto, T. Nagashima, T. Hasegawa, S. Ohara, K. Taira, and K. Kikuchi, OFC Los Angeles, 22–27 February 2004, PDP26 (2004).
  17. A. Mori, K. Shikano, W. Enbutsu, K. Oikawa, K. Naganuma, M. Kato, and S. Aozasa, ECOC Stockholm, 5–9 September 2004, Th3.3.6 (2004).
  18. J. H. Lee, W. Belardi, K. Furusawa, P. Petropoulos, Z. Yusoff, T. M. Monro, and D. J. Richardson, “Four-wave mixing based 10-Gbit/s tunable wavelength conversion using a holey fiber with a high SBS threshold,” IEEE Photon. Technol. Lett. 15(3), 440–442 (2003). [CrossRef]
  19. K. Kikuchi, K. Taira, and N. Sugimoto, “Highly nonlinear bismuth oxide-based glass fibres for all-optical signal processing,” Electron. Lett. 38(4), 166–167 (2002). [CrossRef]
  20. G. Genty, S. Coen, and J. M. Dudley, “Fiber supercontinuum sources (Invited),” J. Opt. Soc. Am. B 24(8), 1771–1785 (2007). [CrossRef]
  21. K. M. Hilligsøe, T. V. Andersen, H. N. Paulsen, C. K. Nielsen, K. Mølmer, S. Keiding, R. Kristiansen, K. Hansen, and J. Larsen, “Supercontinuum generation in a photonic crystal fiber with two zero dispersion wavelengths,” Opt. Express 12(6), 1045–1054 (2004). [CrossRef] [PubMed]
  22. M. R. E. Lamont, B. Luther-Davies, D. Y. Choi, S. Madden, and B. J. Eggleton, “Supercontinuum generation in dispersion engineered highly nonlinear (γ = 10 /W/m) As2S3) chalcogenide planar waveguide,” Opt. Express 16(19), 14938–14944 (2008). [CrossRef] [PubMed]
  23. V. Finazzi, T. M. Monro, and D. J. Richardson, “Small-core silica holey fibers: nonlinearity and confinement loss trade-offs,” J. Opt. Soc. Am. B 20(7), 1427–1436 (2003). [CrossRef]

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