Writing Bragg Gratings in Multicore Fibers

Fiber Bragg gratings in multicore fibers can be used as compact and robust filters in astronomical and other research and commercial applications. Strong ...

University of Sydney

The operation of a self-starting, passively harmonic modelocked, figure-eight laser is experimentally demonstrated. A stable pulse train with near half duty-cycle is produced at a repetition rate of 1.7 GHz at 1536 nm wavelength without any starting/triggering mechanism and stays modelocked as long as it is being pumped.

Semiconductor optical amplifier based high duty-cycle, self-starting figure-eight 1.7 GHz laser source.

The operation of an erbium figure-of-eight all-fiber laser with a fundamental repetition rate of 5.68 MHz, peak power of 0.7 kW and pulse width of 420 fs is reported. Four times the fundamental repetition rate is achieved with two passive sub-ring loops at a repetition rate of 22.8 MHz. The sub-ring loop consists of only a single-mode fiber coupler with an input port and output port connected so as to make the time delay an odd multiple half-period of the input pulse period. This method is simple and inexpensive when compared with conventional methods employing sub-ring cavity or special fiber Bragg grating to control repetition rate.

High-power figure-of-eight fiber laser with passive sub-ring loops for repetition rate control.

Nous caract&eacute;risons la dispersion spatiale en longitudinalement invariant m&eacute;tamat&eacute;riaux dessin&eacute; avec une r&eacute;ponse magn&eacute;tique aux fr&eacute;quences t&eacute;rahertz, auquel cas une variation dans l&#39;angle du champ incident produit un changement dans la fr&eacute;quence de r&eacute;sonance. Nous pr&eacute;sentons un mod&egrave;le analytique simple pour pr&eacute;voir cette &eacute;volution. Nous d&eacute;montrons &eacute;galement que la dispersion spatiale est &eacute;limin&eacute;e en brisant l&#39;invariance longitudinal &agrave; l&#39;aide d&#39;ablation laser. Les r&eacute;sultats exp&eacute;rimentaux sont en accord avec des simulations num&eacute;riques.

Dispersion spatiale dans des m&eacute;tamat&eacute;riaux magn&eacute;tiques dessin&eacute;s en trois dimensions.

Wir charakterisieren die r&auml;umliche Streuung in L&auml;ngs invariante gezeichneten Metamaterialien magnetische Resonanz bei Terahertz Frequenzen, wobei eine Ver&auml;nderung der Winkel des einfallenden Feldes eine Verschiebung der Resonanzfrequenz produziert. Wir pr&auml;sentieren Ihnen ein einfaches analytisches Modell zur Vorhersage von dieser Verschiebung. Wir zeigen auch, dass die r&auml;umliche Streuung durch das brechen der l&auml;ngs-Invarianz mit Laserablation eliminiert wird. Die experimentellen Ergebnisse sind im Einvernehmen mit numerischen Simulationen.

R&auml;umliche Streuung in dreidimensionale gezeichneten magnetische Metamaterialien.

Ci caratterizzano la dispersione spaziale in longitudinalmente invarianti metamateriali disegnati con una risposta a frequenze terahertz, per cui un cambiamento nell&#39;angolo del campo incidente produce un cambiamento nella frequenza di risonanza magnetica. Vi presentiamo un semplice modello analitico per prevedere questo spostamento. Abbiamo anche dimostrare che la dispersione spaziale &egrave; eliminata da rompere l&#39;invarianza longitudinale mediante ablazione laser. I risultati sperimentali sono in accordo con le simulazioni numeriche.

Dispersione spaziale in tridimensionali disegnati metamateriali magnetici.

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We characterize spatial dispersion in longitudinally invariant drawn metamaterials with a magnetic response at terahertz frequencies, whereby a change in the angle of the incident field produces a shift in the resonant frequency. We present a simple analytical model to predict this shift. We also demonstrate that the spatial dispersion is eliminated by breaking the longitudinal invariance using laser ablation. The experimental results are in agreement with numerical simulations.

Spatial dispersion in three-dimensional drawn magnetic metamaterials.

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Caracterizamos la dispersi&oacute;n espacial en metamateriales longitudinalmente invariantes dibujado con respuesta a frecuencias de terahercios, por el que un cambio en el &aacute;ngulo del campo incidente produce un cambio en la frecuencia de resonancia magn&eacute;tica. Presentamos un modelo anal&iacute;tico simple para predecir este cambio. Tambi&eacute;n demostramos que la dispersi&oacute;n espacial se elimina por romper la invarianza longitudinal mediante ablaci&oacute;n con l&aacute;ser. Los resultados experimentales est&aacute;n de acuerdo con simulaciones num&eacute;ricas.

Dispersi&oacute;n espacial en metamateriales magn&eacute;tico dibujado tridimensional.

Fiber Bragg gratings in multicore fibers have significant potential as compact and robust filters for research and commercial applications. With the aid of an innovative, flat-fielded Mach-Zehnder interferometer, we demonstrate deep (>30 dB) narrow (100 pm at 3 dB; 90 pm at 10 dB) notches in the outer 6 cores of a 7-core fiber at a constant wavelength ( ± 15 pm). This is a crucial step in the development of FBGs operating within multimode fibers that carry an arbitrary number of spatial modes.

Seong-sik Min

Sydney Institute for Astronomy,
School of Physics,
Institute of Photonics and Optical Science,
Sydney Institute for Astronomy, School of Physics,
Institute of Photonics and Optical Science, School of Physics

University of Sydney

Writing Bragg Gratings in Multicore Fibers

Seong-sik Min

.css-o250i3{font-size:18px;font-family:Open Sans,sans-serif;line-height:21.6px;}Sydney Institute for Astronomy,School of Physics,Institute of Photonics and Optical Science,Sydney Institute for Astronomy, School of Physics,Institute of Photonics and Optical Science, School of Physics

University of Sydney

Writing Bragg Gratings in Multicore Fibers

Sydney Institute for Astronomy,
School of Physics,
Institute of Photonics and Optical Science,
Sydney Institute for Astronomy, School of Physics,
Institute of Photonics and Optical Science, School of Physics