Polarization dependence of bend loss caused by the polymer coating layer for a standard singlemode fiber (SMF28) is investigated theoretically and experimentally. Bend loss for SMF28 for both the TE and TM mode is calculated separately. Normalized polarization dependent loss is proposed for the characterization of the polarization sensitivity of bend loss for different bend radii. Corresponding...

The article presents a fiber-optic sensor based on singlemode-multimode-singlemode (SMS) structure for simultaneous measurement of strain and curvature. It is shown that the demodulation curvature can be realized using Fourier analysis recorded interference oscillations. Keywords: optical fiber sensors, intermode interference, single mode-multimode-single mode, stretching, bending.

We proposed a novel optical coupling technique based on two parallel singlemode-multimode-singlemode (SMS) fiber structures. This technique utilizes one SMS structure to excite multiple cladding modes within an output singlemode fiber. The excited multiple cladding modes will be coupled to the input SMF in the second SMS structure by placing the two SMS fiber structures in parallel and in close...

A dual-channel single-mode-multi-mode-single-mode (SMS) fiber optic sensor encapsulated by polydimethylsiloxane (PDMS) was proposed for the first time, simultaneous monitoring of brachial and radial arteries accurate blood pressure prediction. With help machine learning algorithm Support Vector Regression (SVR), SMS can continuously accurately monitor systolic diastolic pressure. Commercial sph...

Using the semi-analytic transmission and propagation matrices for guided optical waves, the modal noise in optical waveguide is investigated for a simple three-slab waveguide and a step-index singlemode fiber. It is shown that modal noise can arise from the unbound radation modes which have been excited in the first junction and haven’t been sufficiently attenuated before reaching the second ju...

In this paper we present the fabrication of optical mode field adaptors for fiber optical communications using fiber splicing machine in special newly developed modus. We developed mode field transformers with radii from 5 m to 80 m the end of standard singlemode and multimode glass fibers, characterized by far field and near field methods. Easy and reliable fabrication of the radii with low st...

W ith the advent of Gigabit Ethernet Systems utilizing multimode fiber, the limiting factor in the fiber backbone is no longer the attenuation of the passive link, but rather, the bandwidth of the fiber. Due to different signal characteristics of the transmitter, new test procedures and a new understanding of the interaction between the optical fiber and the optical signal are required. Gigabit...

Respiration rate (RR) is an important information related to human physiological health. A wearable optical fiber sensor for respiration monitoring based on a bend singlemode-multimode-singlemode (SMS) structure, which highly sensitive bend, firstly proposed and experimentally demonstrated. The fastened by elastic belt the abdomen of person will acquire signal when breaths, introduce front back...

We report a characterization of the acoustic sensitivity of microstructured polymer optical fiber interferometric sensors at ultrasonic frequencies from 100kHz to 10MHz. The use of wide-band ultrasonic fiber optic sensors in biomedical ultrasonic and optoacoustic applications is an open alternative to conventional piezoelectric transducers. These kind of sensors, made of biocompatible polymers,...

Magnetooptic Faraday rotation in a strongly twisted singlemode fiber is measured using polarization-optical time domain reflectometry (POTDR) in which a light pulse of 904 nm wavelength makes a roundtiip along the fiber. The experimental results are in good agreement ,with the calculations, and the Verdet constant thus obtained is 0.86 X 10" min/G. cm at h = 904 nm. T HE Faraday rotation of pol...