This paper presents a miniature, high-sensitive, all-silica Fabry-Perot fiber optic sensor suitable for simultaneous measurements of pressure and temperature. The proposed sensor consists of two low fines Fabry-Perot resonators, created at the tip of an optical fiber. The first resonator is embodied in the form of a short air cavity positioned at the tip of the fiber. This resonator utilizes a thin silica diaphragm to achieve the sensor’s pressure response. The second resonator exploits the refractive index-dependence of silica fiber in order to provide the proposed sensor’s temperature measurement function. Both resonators have substantially different lengths that permit straightforward spectrally-resolved signal-processing and unambiguous determination of the applied pressure and temperature.
COBISS.SI-ID: 16108822
This paper presents an optical fiber-field access device suitable for use in different in-line fiber-optics systems and fiber-based photonics components.The proposed device utilizes a thin silica micro-wire positioned in-between two lead-in single mode fibers. The thin micro-wire acts as a waveguide that allows for low-loss interconnection between both lead-in fibers, while providing interaction between the guided optical field and the surrounding medium or other photonic structures. The field interaction strength, total loss, and phase matching conditions can be partially controlled by device-design. The presented all-fiber device is miniature in size and utilizes an all-silica construction. It has mechanical properties suitable for handling and packaging without the need for additional mechanical support or reinforcements. The proposed device was produced using a micromachining method that utilizes selective etching of a purposely-produced phosphorus pentoxide-doped optical fiber. This method is simple, compatible with batch processes, and has good high-volume manufacturing potential.
COBISS.SI-ID: 16494870
In this scientific contribution a multimode fiber that can achieve extreme bend loss while retaining high bandwidth performance, was presented and demonstrated. Bandwidth in excess of 2.5 GHz.km and bend loss well below 0.1 dB at 2.5 mm radius was demonstrated experimentally. Furthermore, the proposed fiber exhibits full compatibility and low interconnectivity losses with legacy 50 µm telecom fiber. The proposed MM-BIF fiber can thus transparently replace standard telecommunication-grade MM fibers in measurement and communication systems requiring tight fiber bends.
COBISS.SI-ID: 16418070