Front Matter 6873

Proceedings of SPIE, 2008

A modal solution approach based on the powerful, full-vectorial, H-field based finite element method (FEM) has been used to analyze the single mode operation of a PCF. Modal solutions of the fundamental modes of highly birefringent PCFs have been obtained. The FEM with perfectly matched layer condition has been used to characterize the leakage loss and the differential loss between the polarized modes of PCFs. The design of a single-mode single-polarization PCF has also been proposed.

Optics Express, 2005

We report on the design of a single-polarization single-transverse mode large mode area photonic crystal fiber. By including index-matched stress applying elements in the photonic cladding an ultra-broadband single polarization window is obtained while a large mode field area of ~700 µm² is maintained. Based on that design, an Yb-doped double-clad photonic crystal fiber is realized that combines low nonlinearity and single polarization properties. A first result of the high power operation using this fiber is demonstrated.

2006

Photonic crystal fibers provide increased range of mode-field diameters for passive and active fibers. At present, single mode photonic crystal fibers with mode field diameters ranging from sub-micron to beyond 40 ptm have been demonstrated. For a number of applications, it is desirable to introduce polarization maintaining properties of such fibers. In this presentation, we report on the latest development within this area and explain the design and characteristics of different types of photonic crystal fibers with both polarization-maintaining and polarizing properties. , "Polarization maintaining large mode area photonic crystal fiber" Opt. Express 12, 956 (2004).

Optik, 2013

By controlling photonic crystal fiber structures it is possible to achieve a single-mode propagation condition in a large wavelength region. The single-mode condition for silica photonic-crystal fiber is obtained using simulation study. Comparison of different structures simulation results of PCF shows that the cubical cross sectional pattern of air holes in a silica fiber is in a better agreement with the single-mode condition (the optimal structure).

IEEE Photonics Technology Letters, 2000

We present the fabrication of a polarizing, endlessly single-mode microstructured fiber with high polarization-dependent loss. The fiber was fabricated by the stack-and-draw method. The resulting structure consists of a pure silica core surrounded by a regular lattice of air holes, in which four air holes in the inner ring have been enlarged. An extinction ratio of 16 dB/m with a transmission loss of 0.9 dB/m was achieved at a wavelength of 1550 nm.

Journal of Lightwave Technology, 2000

A single-mode photonic crystal fiber (PCF) with low chromatic dispersion, low bend, and rotational sensitivity is presented. The transverse electric field vector distributions of the fundamental, higher order and fundamental space filling modes, their effective indices, chromatic dispersion, confinement, bending and rotational losses are reported using full-vector finite-element method (FEM). In addition, the endlessly single mode behavior is demonstrated by employing the parameter of the proposed PCF. It has also been shown that the proposed PCF design is insensitive to bends and rotations.

Physics of Fluids, 2004

Using a finite-element mode solver, the modes of a commercial endlessly single-mode photonic crystal fiber (ESM-PCF) were investigated. Based on the loss discrimination between the dominant and the nearest higher order mode, we set-up a criterion for the single-modeness. Using that measure, we verified the single-modeness of the corresponding ESM-PCF and found that the endlessly single-modeness are valid only for

Optics Express, 2008

We report on an ytterbium-doped single-transverse-mode rodtype photonic crystal fiber that combines the advantages of low nonlinearity and intrinsic polarization stability. The mode-field-area of the fundamental mode is as large as 2300 µm 2. An output power of up to 163 W with a degree of polarization better than 85% has been extracted from a simple fiber laser setup without any additional polarizing element within the cavity than the fiber itself. The beam quality has been characterized by a M 2 value of 1.2. The single-polarization window ranges from 1030 to 1080 nm, hence possesses an excellent overlap with the gain profile of ytterbium-doped silica fibers. To the best of our knowledge this fiber design has the largest mode-field-diameter ever reported for polarizing or even polarization maintaining rare-earth-doped double-clad fibers.

Optical Engineering, 2003

Photonic crystal fibers (PCFs) are quite useful for confining and guiding light with interesting modal properties. The scattering matrix method is used to calculate the higher order modes guided in a PCF. The model is derived from the solution of the boundary condition problem taking into consideration the coupling between the electric and the magnetic fields. Results are presented for novel fibers that allow for only azimuthal modes.

Optics & Photonics News, 2001

We report a strongly anisotropic photonic crystal fiber. Twofold rotational symmetry was introduced into a single-mode fiber structure by creation of a regular array of airholes of two sizes disposed about a pure-silica core. Based on spectral measurements of the polarization mode beating, we estimate that the fiber has a beat length of approximately 0.4 mm at a wavelength of 1540 nm, in good agreement with the results of modeling.