نتایج جستجو برای: fiber couplers

تعداد نتایج: 133163  

2013
Khair Al Shamaileh Mohammad Almalkawi Vijay Devabhaktuni Nihad Dib

Miniaturized and tunable 3 dB hybrid and rat-race couplers using capacitively-loaded (C-loaded) transmission lines are designed. Couplers’ compactness has been achieved by substituting the conventional quarter wave transformers in both couplers by their equivalent C-loaded units. The tunable center frequency of the proposed couplers is realized by varying the transmission line loading capacitan...

2014
Marcus MacDonell Jonathan Scott

Acoustic Directional Couplers permit separation of forward and reverse sound pressure waves. This separation opens the way to traceable precision acoustic reflection measurements. In order to span the audio frequency range, multiple couplers will be required, as each operates over a frequency range of slightly more than one octave. To reach 20kHz or above requires vary small, mechanically preci...

2000
K. - H. Hofmann U. Beckmann T. Blöcker V. Coude du Foresto M. Lacasse R. Millan - Gabet S. Morel B. Pras C. Ruilier D. Schertl M. Scholz V. Shenavrin W. Traub G. Weigelt M. Wittkowski B. Yudin

We present K-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner which provides high-accuracy visibility measurements in spite of time-variable atmospheric conditions.

Journal: :Advanced photonics 2021

Cylindrical vector beams and vortex beams, two types of typical singular optical characterized by axially symmetric polarization helical phase front, possess the unique focusing property ability carrying orbital angular momentum. We discuss formation mechanisms such in few-mode fibers under basis show recent advances generating techniques that are mainly based on long-period fiber gratings, mod...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1389

abstract: country’s fiber optic network, as one of the most important communication infrastructures, is of high importance; therefore, ensuring security of the network and its data is essential. no remarkable research has been done on assessing security of the country’s fiber optic network. besides, according to an official statistics released by ertebatat zirsakht company, unwanted disconnec...

2001
Juerg Leuthold Charles H. Joyner

New, compact multimode interference couplers with tunable power splitting ratios have been realized. Experiments show large tuning ranges. Such couplers are needed to optimize ON–OFF ratios in interferometric devices and may find applications as extremely compact switches.

2010
M. G. Moharam

A program of study of planar dielectric grating couplers was undertaken. The study focused on the problems associated with using dielectric grating couplers to achieve high efficiency beam coupling to planar waveguide

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