Abstract
Fiber-optic networks, equipped with various optical sensors connected by optical fiber links are considered at present as one of the most efficient, versatile and reliable solution for application in monitoring systems of practically any kind. Among different types of sensing elements, one of the most attractive and commonly deployed are fiber Bragg gratings (FBG), enabling fast and accurate measurement of physical parameters such as temperature, strain or pressure [1, 2]. However, FBG-based systems still suffer from certain problems with interrogating instruments, typically based on discrete optoelectronic components, which negatively influences the complication and size of the device and its power consumption, which in turn projects directly on the cost of device. In this work we propose a more efficient way of realizing such an interrogator, using a generic InP-based technology of photonic integration, which allows monolithic integration of passive waveguides, Bragg gratings, amplifiers and phase modulators on a single substrate [3]. The interrogator was designed as an application specific photonic integrated circuit (ASPIC) and was fabricated on a multi-project wafer in an InP foundry [4].
© 2015 IEEE
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