Abstract

We study the birefringence and polarization coupling in the index-guiding photonic crystal fibers (PCFs) with squeezed hexagonal crystal lattice. The sign of form birefringence in such photonic crystal fibers can be changed as the wavelength changes, which is reported for the first time to our knowledge. A PCF-based polarization splitter with squeezed hexagonal lattice is proposed to achieve excellent extinction ratio and a simpler structure than those reported previously.

© 2004 Optical Society of America

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Appl. Phys. Lett. (1)

Van der Ziel, J. P., �??Phase-matched harmonic generation in a laminar structure with wave propagation in the plane of the layers,�?? Appl. Phys. Lett. 26, 60�??62 (1975).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

J. C. Knight, J. Arriaga, T. A. Birks, A. Ortigosa-Blanch, W. J. Wadsworth, and P. St. J. Russell, �??Anomalous dispersion in photonic crystal fiber,�?? IEEE Photon. Technol. Lett. 12, 807-809 (2000).
[CrossRef]

T. P. Hansen, J. Broeng, S. E. B. Libori, E. Knudsen, A. Bjarklev, J. R. Jensen, and H. Simonsen, �??Highly birefringent index-guiding photonic crystal fibers,�?? IEEE Photon. Technol. Lett. 13, 588-590 (2001).
[CrossRef]

IEEE/LEOS Annual Meeting 2003 (1)

L. Zhang and C. Yang, �??Polarization selective coupling in the holey fiber with asymmetric dual cores,�?? in Proc. IEEE/LEOS Annual Meeting 2003, (IEEE, October 26-30, Tucson, AZ, 2003), paper ThP 1.

J. Lightwave Technol. (3)

J. Opt. Soc. Am. B (1)

Nature (1)

A. Fiore, V. Berger, E. Rosencher, P. Bravetti and J. Nagle, �??Phase matching using an isotropic nonlinear optical material,�?? Nature 391, 463-466 (1998).
[CrossRef]

OFC 02 post deadline paper (1)

K. P. Hansen, J. R. Jensen, C. Jacobsen, H. R. Simonsen, J. Broeng, P. M..W.Skovgaard, A. Petersson, and A. Bjarklev, �??Highly nonlinear photonic crystal fiber with zero-dispersion at 1.55 µm,�?? OFC 02 post deadline paper FA9, (2002).

Opt. Express (5)

W. H. Reeves, J. C. Knight, P. S. J. Russell, and P. J. Roberts, "Demonstration of ultra-flattened dispersion in photonic crystal fibers," Opt. Express 10, 609-613 (2002) <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-14-609">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-14-609</a>.
[CrossRef] [PubMed]

K. P. Hansen, �??Dispersion flattened hybrid-core nonlinear photonic crystal fiber,�?? Opt. Express 11, 1503-1509 (2003) <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-13-1503">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-13-1503</a>.
[CrossRef] [PubMed]

K. Suzuki, H. Kubota, S. Kawanishi, M. Tanaka, and M. Fujita, �??Optical properties of a low-loss polarization-maintaining photonic crystal fiber,�?? Opt. Express 9, 676-670 (2001) <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-9-13-676">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-9-13-676</a>.
[CrossRef] [PubMed]

L. Zhang and C. Yang, �??Polarization splitter based on photonic crystal fibers,�?? Opt. Express 11, 1015-1020 (2003) <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-9-1015">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-9-1015</a>.
[CrossRef] [PubMed]

F. Fogli, L. Saccomandi, P. Bassi, G. Bellanca, and S. Trillo, �??Full vectorial BPM modeling of indexguiding photonic crystal fibers and couplers,�?? Opt. Express 10, 54-59 (2002) <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-1-54">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-1-54</a>.
[CrossRef] [PubMed]

Opt. Lett. (3)

Proc. OFC (1)

P. Petropoulos, T. M. Monro, W. Belardi, K. Furusawa, J. H. Lee and D. J. Richardson, �??A highly nonlinear holey fiber and its application in a regenerative optical switch,�?? TuC3, Proc. OFC 2001 (2001).

Science (2)

J. C. Knight, J. Broeng, T. A. Birks, and P. St. J. Russell, �??Photonic band gap guidance in optical fibers,�?? Science 282, 1476-1478 (1998).
[CrossRef] [PubMed]

J. C. Knight, P. St. J. Russell, �??Photonic crystal fibers: new ways to guide light,�?? Science 296, 276-277 (2002).
[CrossRef] [PubMed]

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Figures (7)

Fig. 1.
Fig. 1.

Cross section of the PCF-PMF.

Fig. 2.
Fig. 2.

Birefringence versus diameter of the air holes.

Fig. 3.
Fig. 3.

Birefringence versus the lattice pitch in the x-axis direction.

Fig. 4.
Fig. 4.

Birefringence versus wavelength.

Fig. 5.
Fig. 5.

Photonic crystal fiber polarization splitter with the squeezed crystal lattice.

Fig. 6.
Fig. 6.

Normalized power transferring curves of the PCF-based polarization splitter.

Fig. 7.
Fig. 7.

Intensity distributions at the output of the polarization splitter.

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