Polymer optical fiber (POF) sensors based on the Optical Time Domain Reflectometry (OTDR) technique provide the unique ability to measure high strain up to 40 % fully distributed along the fiber. Standard PMMA POF are introduced and evaluated in potential use and applicability. The advances in distributed POF strain sensor technology are concluded with respect to application in structural healt...

Bragg grating in a single-mode photosensitive polymer optical fiber (POF) with benzil dimethyl ketal (BDK)-doped in core has been inscribed through the Sagnac ring interference method. The Bragg wavelength of grating is about 1570nm. The stress and strain response of fiber Bragg grating (FBG) has been studied respectively. By fitting the experimental result, the strain sensitivity of FBG in POF...

We describe the operation of an all-optical probe that provides an alternative means of implementing photoacoustic and photothermal investigative techniques, particularly those used in biomedical applications. The probe is based on a transparent, acoustically and thermally sensitive Fabry-Perot polymer film sensor mounted at the end of an optical fiber. We demonstrate the ability of the system ...

We fabricate a free-standing few-layer molybdenum disulfide (MoS2)-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1535 nm to 1565 nm, are generated, corresponding to photon energies below the MoS2 material bandgap. These results contribut...

We develop a single-end-access strain/temperature sensor configuration based on multimodal interference in a polymer optical fiber (POF) with an extremely high sensitivity. The light Fresnel-reflected at the distal open end of the POF is exploited. We obtain high strain and temperature sensitivities of –122.2 pm/με and 10.1 nm/°C, respectively, which are shown to be comparable to those in two-e...

We present dynamic full-field optical coherence microscope imaging using a scientific complementary metal oxide semiconductor camera in conjunction with a demodulation scheme based on the Riesz transform and monogenic signals. The potential of our approach is verified by a comparison with conventional phase-stepping as well as with an analytic reconstruction method and finally exemplified for d...

Low-loss, single-mode optical waveguides have been fabricated from photopolymerizable acrylic monomers. The material system consists of a low-index cladding resin and a highindex core resin. The two resins are miscible so that precise control over the refractive index can be obtained. This allows the fabrication of single-mode waveguides with specific crosssectional dimensions. One advantage of...

This paper describes and compares the different approaches most commonly used for power spectrum estimation in continuous-time linear adaptive equalizers based on the conventional feedback scheme for Gbps digital communications. In addition, a new equalization approach based on the feedforward topology is proposed. As an example, simulation results demonstrate some advantage of feedforward agai...

purpose : to determine the nerve fiber layer and macular thickness by optical coherence tomography (oct) in emmetropic, high-myopic and high-hyperopic eyes methods : one hundred five eyes of 55 randomly selected healthy subjects between 20 and 30 years old were included in this study. the eyes were categorized in three groups (high-myopic, emmetropic and high-hyperopic) according to their cyclo...

This paper reports the successful characterisation of polymers from past conservation treatments using Raman spectroscopy with a fibre-optic probe. It has been demonstrated for the first time that this methodology is well suited to the in-situ examination of polymers used as adhesives and gapfillers for conservation of glass artefacts. By means of a Raman spectroscopic instrument with a fibre-o...