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The monitoring of the optical fiber infrastructure, especially within the intra‐office range, is an essential practice for the maintenance of high quality of service. The majority of the commonly available monitoring techniques carries high complexity and/or costs or is not suited to permanent fiber fault examination. In this article, it is proposed a novel low‐cost monitoring technique based on the back reflection of the Raman pump signal. We demonstrate, experimentally and recurring to Monte‐Carlo numerical simulation, that the histogram profile of the photodiode current produced by the reflected signal depends on the number of reflective events occurring in the intra‐office fiber section. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2828–2830, 2016

No abstract

The diagnosis of several diseases can be performed by analyzing the blood plasma of a patient. Despite extensive research work, there is still a need to improve current low-cost fabrication techniques and devices for the separation of plasma from blood cells. Microfluidic biomedical devices have great potential for that process. Hence, a microfluidic device made by micromilling and sealed with an oxygen plasma technique was tested by means of two different blood analogue fluids. The device has four microchannels with similar geometries but different channel depths. A high-speed video microscopy system was used for the visualization and acquisition of the flow of the analogue fluids throughout the microchannels of the device. Then, the separation of particles and plasma was evaluated with the ImageJ software by measuring and comparing the grey values at the entrance and the exit of the channel. The device showed a significant reduction of the amount of cells between the entrance and the exit of the microchannels. The depth of the channels and the size of the particles were not found to exert any major influence on the separation process. However, it was found that the flow rate affected the separation results, as the best results were obtained for a flow rate of 100 μL/min. Though these results are promising, further analyses and optimizations of microfluidic devices, as well as comparisons between devices sealed using different methods such as the solvent bonding technique, will be conducted in future works.