Single-design-parameter microstructured optical fiber for chromatic dispersion tailoring and evanescent field enhancement

Abstract

A microstructured optical fiber with a single design parameter is proposed and demonstrated. In such a structure three thin, long glass webs join in the fiber center, forming its core. By changing the web thickness it is possible to tune the zero-dispersion wavelength from approximately 0.7 to >2.0 microm while keeping a tiny core area and single-mode guidance. Supercontinuum generation is shown in a silica fiber with a web thickness of 850 nm. The small core area and the massive hole area also make the structure very attractive for the sensing and study of fluids.

Second zero dispersion wavelength measurement through soliton self-frequency shift compensation in suspended core fibre

“…Suspended core fibres are a new example of the extreme light confinement that is feasible in photonic crystal fibres with sub-micron core diameters [2]. This tight light confinement significantly affects the dispersion characteristics, leading to a local extremum in the group-velocity dispersion (GVD) curve and a second zero dispersion wavelength (IR-ZDW) below 2 m. Several powerful fully vectorial techniques have been proposed to simulate the wavelengthdependent parameters of the guided modes, such as dispersion and effective area.…”

Gas detection with micro- and nano-engineered optical fibers

“…The power fraction of evanescent field increases with reducing core diameter, and a power fraction up to 30% in air can be achieved with a SCF with core diameter of 0.89 lm at k = 1550 nm. Investigations on the SCFs with similar structures have been carried out by Webb et al [35], Cordeiro et al [69] and Monro et al [67,70], respectively.…”

Numerical and Experimental Studies for a High Pressure Photonic Crystal Fiber Based Sensor

“…lb and Table I, the most sensitive fiber regarding the change in the effective index, is the suspended core fiber without a circular core (D=0 \xm in the schema of Fig. 2, Y-shaped fiber [3]). At }t=633 nm, A«eff for such structure can reach 6.42*10"" for 1000 bar of hydrostatic external applied pressure while the best result in Fig.…”

“…In this work the effective refractive index of the fundamental mode was modeled for pressures until 1000 bar for a set of regular PCFs in a range of different parameters, namely the pitch (distance between consecutive holes) and the ratio d/pitch (hole diameter/pitch), and for fibers with just one ring of holes (Y-shaped fiber) [3]. Experimentally we characterize a silica photonic crystal fibers showing that the microstructure can deal with pressures as high as 500 bar.…”