-
A. Petersson,
J. Broeng,
K.P. Hansen,
M.D. Nielsen,
H.R. Simonsen,
C. Jakobsen,
J.R. Folkenberg,
T. Schreiber,
F. Roser,
O. Schmidt,
J. Limpert,
R. Iliew,
F. Lederer,
A. Tunnermann
[show abstract]
[hide abstract]
ABSTRACT: 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 μm 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.
Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006; 04/2006
-
T Schreiber,
F Röser,
O Schmidt,
J Limpert,
R Iliew,
F Lederer, A Petersson,
C Jacobsen,
K Hansen,
J Broeng,
A Tünnermann
[show abstract]
[hide abstract]
ABSTRACT: 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 microm(2) 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.
Optics Express 10/2005; 13(19):7621-30. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report on the laser properties of multicore photonic crystal fiber lasers. A stable phase locking of six- and seven-core structures through evanescent coupling is observed. Effective supermode selection is obtained by using both diffraction losses and the Talbot effect. A pure in-phase supermode is obtained (1.1 times diffraction limited). The laser operating in this mode has a slope efficiency of 70% with up to 44 W of output power. The modal area of the in-phase supermode multicore fiber is 1150 microm2, which makes it, to our knowledge, the single-mode fiber laser with the largest mode field area. In-phase laser action is stable when the fiber is bent.
Optics Letters 08/2005; 30(13):1668-70. · 3.40 Impact Factor
-
J Limpert,
N Deguil-Robin,
I. Manek-Honninger,
F Salin,
F. Roser,
A Liem,
T Schreiber,
S. Nolte,
H. Zellmer,
A. Tunnermann,
J. Broeng, A Petersson,
C. Jakobson
[show abstract]
[hide abstract]
ABSTRACT: We report on a novel ytterbium-doped fiber design which combines the advantages of rod and fiber gain media. 120 W output power in single-mode beam quality are obtained from a 48 cm long fiber cane.
Lasers and Electro-Optics, 2005. (CLEO). Conference on; 06/2005
-
J Limpert,
N Deguil-Robin,
I Manek-Hönninger,
F Salin,
F Röser,
A Liem,
T Schreiber,
S Nolte,
H Zellmer,
A Tünnermann,
J Broeng, A Petersson,
C Jakobsen
[show abstract]
[hide abstract]
ABSTRACT: We report on a novel ytterbium-doped fiber design that combines the advantages of rod and fiber gain media. The fiber design has outer dimensions of a rod laser, meaning a diameter in the range of a few millimeters and a length of just a few tens of centimeters, and includes two important waveguide structures, one for pump radiation and one for laser radiation. We obtained 120-W output power in single-mode beam quality from a 48-cm-long fiber cane that corresponds to an extracted power of 250 W/m. The fiber has significantly reduced nonlinearity, which therefore allows for scalability in the performance of a high-peak-power fiber laser and amplifier system.
Optics Express 03/2005; 13(4):1055-8. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Recent development achievements in high power fiber laser designs and subassemblies have improved the performance and usability. Such achievements show the path for these fiber lasers out of the R&D labs and into industrial environments.
Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE; 12/2004
-
[show abstract]
[hide abstract]
ABSTRACT: We report on an air-clad large-core single-transverse-mode ytterbium-doped photonic crystal fiber with a mode-field-diameter of 35 microm, corresponding to a mode-field-area of ~1000 microm(2). In a first experiment this fiber is used to amplify 10-ps pulses to a peak power of 60 kW without significant spectral broadening due to self-phase modulation allowing for the frequency up-conversion of these pulses using narrow-bandwidth phase matched nonlinear crystals.
Optics Express 05/2004; 12(7):1313-9. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We investigate how the strongly wavelength-dependent birefringence in nonlinear photonic crystal fibers leads to a splitting in the zero-dispersion wavelength for the two polarizations. We translate the requirements for the maximum splitting of the zero-dispersion wavelength to requirements for transverse structural uniformity by adopting a simple effective-index approach in which the birefringence is calculated in a step-index fiber with an elliptical core. We find that to reduce the splitting to less than 1 nm the birefringence should be less than 2 x 10(-5), resulting in a transverse uniformity requirement of 1-3%, depending on the index step from the core to the cladding.
Optics Letters 02/2004; 29(1):14-6. · 3.40 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Quasi error-free 10Gbit/s data transmission is demonstrated over a novel type of 50 microm core diameter photonic crystal fi ber with as much as 100m length. Combined with 850 nm VCSEL sources, this fi ber is an attractive alternative to graded-index multi-mode fi bers for datacom applications. A comparison to numerical simulations suggests that the high bit-rate may be partly explained by inter-modal diffusion.
Optics Express 09/2003; 11(17):1953-9. · 3.59 Impact Factor
-
Jens Limpert,
T Schreiber,
S Nolte,
H Zellmer,
T Tunnermann,
R Iliew,
F Lederer,
J Broeng,
G Vienne, A Petersson,
C Jakobsen
[show abstract]
[hide abstract]
ABSTRACT: We report on a 2.3 m long air-clad ytterbium-doped large-modearea photonic crystal fiber laser generating up to 80 W output power with a slope efficiency of 78%. Single transverse mode operation is achieved with a mode-field area of 350 microm2. No thermo-optical limitations are observed at the extracted ~35W/m, therefore such fibers allow scaling to even higher powers.
Optics Express 05/2003; 11(7):818-23. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report on a range of novel properties of the new generation of highly nonlinear photonic crystal fibers with zero dispersion near 1.55 μm. Aspects of loss mechanisms, dispersion properties and birefringence tailoring are described.
Optical Fiber Communications Conference, 2003. OFC 2003; 04/2003
-
[show abstract]
[hide abstract]
ABSTRACT: We numerically study the possibilities for improved large-mode-area endlessly single-mode photonic crystal fibers for use in high-power delivery applications. By carefully choosing the optimal hole diameter, we find that a triangular core formed by three missing neighboring air holes considerably improves the mode area and loss properties compared with the case with a core formed by one missing air hole. In a realized fiber we demonstrate an enhancement of the mode area by approximately 30% without a corresponding increase in the attenuation.
Optics Letters 04/2003; 28(6):393-5. · 3.40 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate, for the first time, a highly nonlinear polarization maintaining photonic crystal fiber with zero dispersion at 1.55 μm, nonlinear coefficient of 20 (Wkm)<sup>-1</sup> and splice loss to standard technology fiber of 0.3 dB.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
-
[show abstract]
[hide abstract]
ABSTRACT: An all-silica photonic crystal fiber with a core diameter of 15 mum was fabricated. Attenuation, dispersion and dispersion slope at 1550 nm were measured to be 2.2 dB/km, 27 ps/(km-nm) and 7.2middot10 <sup>-2</sup> ps/(km-nm<sup>2</sup>), respectively
Optical Communication, 2002. ECOC 2002. 28th European Conference on; 02/2002
