Quartz fibers are used in high energy physics experiments as the active medium in high radiation area calorimetry. Quartz fibers are also used in the transmission of optical signals. Even though quartz does not damage by moderate amounts of irradiation, the clad of the fibers and the protective coating (buffer) do damage reducing light transmission. Various types of quartz fibers have been irra...

A fiber-optic structure based on a section of a double-clad fiber with depressed inner cladding is investigated for bend sensing. The structure is formed by splicing a section of SM630 fiber between two standard fibers SMF-28. The operation principle relies on the sensitivity of cladding modes that are induced at a splice of fibers having different refractive index profiles. The transmission sp...

Scintillating fibers are widely used in particle detectors, mainly for tracking. We have studied the properties and compared performance of different blue-emitting 250~$\mu$m diameter round double-clad scintillating from Kuraray Saint-Gobain. Here we focus on over short lengths ($< 50~{\rm cm}$), particular their timing performances. report light yield attenuation, scintillation decay time achi...

The cladding pumping within a double-clad fiber structure is an effective technique to convert high-power multimode beam into high-power, almost diffraction limited beam. Since the pump efficiency by presence of higher skew-ray modes, geometrical perturbations are used scramble modes and achieve overlap electromagnetic field with doped core. In this paper, combined effect coiling twisting inves...

Two fiber Raman probes are presented, one based on an optically-poled double-clad fiber and the second based on an optically-poled double-clad fiber coupler respectively. Optical poling of the core of the fiber allows for the generation of enough 532nm light to perform Raman spectroscopy of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman...

An exhaustive and simple method for dispersion flattening in double-clad single-mode fibers is presented. The idea is to generate all such fibers with a certain cutoff wavelength and then find, by one-dimensional minimization and direct inspection, fibers yielding minimum dispersion. As examples, the root mean square chromatic dispersion over the wavelength range (1.25, 1.60 µm) is minimized fo...

In this work we present the results of our research on a pump power combiner fabrication process in configuration (N+1)×1. Our fabrication method is based on tapering a fiber bundle consisting of 6 multimode fibers and one signal fiber. We present the results on fabrication power combiners based on single mode fibers and large mode area fibers for the signal. Pump power combiners are one of the...

We have analyzed and calculated the temperature and strain sensitivities of a high-birefringence double-clad elliptical fiber. We propose a method to minimize these sensitivities without increasing the fiber size or weight; this is achieved by selecting suitable fiber parameters-core ellipticity, refractive index difference, and thickness of the inner cladding. In addition, we discuss the desig...