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EN
The paper presents results of a simulation of the plasmon effect achieved between a thin precious metal layer and a biconical optical fibre taper, manufactured on a standard single mode fibre. Gold, silver and titanium were used as a metal which fulfilled a cladding function for a small diameter structure. For simulation Mode Solution software was used on which modal and frequency analyses of a wavelength were provided in the range of 800–1700 nm. A displacement of a plasmon pick in dependence of thickness of a deposited precious layer for the highest plasmon effects was observed.
EN
Investigations of internal structure changes along an optical fiber during the manufacture of biconical taper have been described. Basing on the constant volume theory, classification of biconical structures manufactured on a special set-up is presented and discussed. The interferometric tomography method has been used for determination of 3D geometry and refractive index distribution in manufactured optical fiber tapers. The experiments provide detailed information on external (diameter of cladding) as well as internal (core diameter and refractive index profile) changes along the taper region. The results have been discussed in relation to the parameters of the manufacturing process.
PL
W artykule przedstawiono wstępne wyniki dotyczące szerokopasmowego sprzęgacza światłowodowego wykonanego na bazie włókna fotonicznego LMA10. Element ten został wytworzony w standardowej technice powolnego wyciągania skręconej pary włókien podgrzewanych do temperatury mięknienia na odpowiednio zdefiniowanym obszarze. Przedstawione charakterystyki spektralne pokazują unikalne własności sprzęgacza wytworzonego w tej technologii. Dla szerokości obszaru sprzężenia 10 mm uzyskano pasmo użytkowe w zakresie 900...1700 nm. W chwili obecnej, nie jest znane autorom, uzyskanie sprzęgacza o takich parametrach. Do dokładnego scharakteryowania podziału mocy wytworzonego sprzęgacza przeprowadzono pomiary z wykorzystaniem przestrajalnego lasera jednodomowego oraz analizatora widma w zakresie telekomunikacyjnych pasm C i L. Dla długości fali 1590,5 nm, dla której podział mocy wynosi 50x50 pokazano charakterystyki polaryzacyjne wskazujące na silnie zależny spółczynnik sprzężenia od wejściowego stanu polaryzacji.
EN
In the paper some preliminary results of broadband photonics crystal fiber coupler (BPCFC) are presented. The BPCFC was fabricated by means of the LMA10 fiber and by application standard manufacturing method of the fused fiber couplers. For such element, the some unique results are presented mainly wide range of wavelength operation from 900 up to 1700 nm. In spite of fact non uniform power splitting ratio of the coupler, the mentioned above wide range of wavelength allows its practical application. Spectral characteristics for particular wavelengths from 1530... 1630 nm was shown for identification that for 1590 and 1630 nm BPCFC has almost the same 50/50 splitting ratio. For 1550 nm splitting ratio was around 10x90. The most interesting feature of BPCFC is its polarization dependence of the splitting ratio parameter. It gives opportunity to use it in many applications in which it is necessary to tune a splitting ratio during the measurement.
PL
W niniejszym artykule przedstawiono wyniki związane z wytworzeniem sprzęgacza światłowodowego typu X wykonanego na włóknie mikrostrukturalnym nieskończenie jednomodowym. Sprzęgacz został przebadany pod względem wyjściowych właściwości transmisyjnych dla różnych zakresów długości falowych.
EN
The investigation of the X-type optical fiber made on endlessly single-mode photonics crystal fiber are presented in the paper. The output spectrum in the wide wavelength range has been determined as the main results of coupler investigation.
PL
Praca przedstawia eksperymentalne wyniki poszerzenia impulsu laserowego dużej mocy w standardowych światłowodach telekomunikacyjnych. Poszerzenie uzyskano poprzez wykorzystanie technologii przewężki dwustronnej, której optymalizacja dla danego typu włókna pozwala na sterowanie tak szerokością impulsu jak i składem widmowym wychodzącej wiązki, prowadząc w konsekwencji do generacji światła białego.
EN
The papers describes the results of a laser pulse broadening in tapered standard single mode fiber. Additional description of a set - up for taper manufacturing, with a principle of its operation, based on elongation procedure of fiber-optics in a low-pressure gas burner, is also presented. A virtue of such a set-up is the possibility of different kinds of taper manufacturing, like punctual, long distance on regular or increasing distance. Tapering process allows us to change a diameter of an optical fiber what means boundary condition changes, beam is propagating in a core (made from silica) surrounded by air. There is a large refractive index step between these two media, allowing for confined pulse (with high power) in a very small area. This effect causes increasing intensity of a propagated beam and amplifies nonlinear effects, like self-phase modulation etc. The article presents the results of pulse broadening obtained in different tapers, made on a single-mode fiber for a wavelength of 1310 nm and a core diameter of about 9 žm. As a light source, the pumped laser operated at a wavelength of 532 nm, which emitted the pulses of 0.6 ns with a repetition rate of about 1 kHz, has been used. All the measured fibers with a taper have a length of about 3 m, where about 1.2 m was for the input (for easier launching) and the output (for easier connection with an optical spectrum analyzer). Experimental results show the pulse broadening in the used taper structures. The best result are obtained for a long distance taper, where the elongated part was about 50 mm (flame brush is travelling to and from along the constant length). For this taper, it can be observed more flat spectrum broadening to the longer wavelength, together with increasing average power of a laser. Theoretically the best broadening we should obtain for a taper length of about 100 mm what will be one of the next subjects of our research. Other tapers also cause broadening effects but their spectra are not so flat. Interesting example is a taper with an increasing length of elongation. We observed additional spectral pick at the wavelength of about 630 nm and 950 nm. These picks are connected with the smaller core diameter obtained in this type of tapering process (the smaller core, the larger broadening). The worst results were for a punctual taper. In this case, a diameter of a taper is very small (about several micrometers) but the losses are very high. The presented results show that biconical tapered single mode optical fiber is a good way to obtain spectral broadening (supercontinuum effect).
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