In this paper we describe the design and successful implementation of a remotely operated physiological monitoring device. The prototype performs acquisition of three types of physiological measurements: electrocardiography, finger photoplethysmography, and blood pressure plethysmography. Various components are shared in the acquisition of the three signals, such as the microcontroller, the communication module and part of the analog front-end to achieve a low cost integrated device. The waveforms are sent to a remote backend server using a Wi-Fi internet connection. The system is designed so that the device can be controlled remotely without the patients’ intervention

Three Transducers Embedded into One Single SiC Photodetector: LSP Direct Image Sensor, Optical Amplifier and Demux Device | InTechOpen, Published on: 2011-03-22. Authors: M. Vieira, P. Louro, M. Fernandes, et

Photonic circuits find applications in biomedicine, manufacturing, quantum computing and communications. Photonic waveguides are crucial components, typically having cross-section orders of magnitude inferior when compared with other photonic components (e.g., optical fibers, light sources and photodetectors). Several light-coupling methods exist, consisting of either on-plane (e.g., adiabatic and end-fire coupling) or off-plane methods (e.g., grating and vertical couplers). The grating coupler is a versatile light-transference technique which can be tested at wafer level, not requiring specific fiber terminations or additional optical components, like lenses, polarizers or prisms. This study focuses on fully-etched grating couplers without a bottom reflector, made from hydrogenated amorphous silicon (a-Si:H), deposited over a silica substrate. Different coupler designs were tested, and of these we highlight two: the superimposition of two lithographic masks with different periods and an offset between them to create a random distribution and a technique based on the quadratic refractive-index variation along the device’s length. Results were obtained by 2D-FDTD simulation. The designed grating couplers achieve coupling efficiencies for the TE-like mode over −8 dB (mask overlap) and −3 dB (quadratic variation), at a wavelength of 1550 nm. The coupling scheme considers a 220 nm a-Si:H waveguide and an SMF-28 optical fiber.