Fiber optic shape sensing has a great potential for diverse medical and industrial applications to measure curvatures and even shapes. Featuring small footprint, strong immunity to radiation and high flexibility integration, fiber optic shape sensing opens up a new era in the fields of position tracking, human wearable devices, catheter navigation, bending detection and deformation monitoring. This paper focuses on a branch of fiber optic shape sensing techniques, with an emphasis on shape sensing based on fiber Bragg gratings (FBGs). Key technologies of shape sensing based on FBG are introduced in detail together with a critical view of its evolutionary trend. In addition, the major problems that exist in FBG shape sensing have been discussed in the end.
In modern optical communication systems, signal light polarization state control technology can not only realize highspeed and large-capacity communication, but is also an indispensable part in the design of photonic integrated circuits. So far, the polarization extinction ratio (PER) is the main factor limiting the bandwidth of polarization control devices and it causes additional polarization loss in the whole communication system. Additionally, with the development of optical wireless communication technology in free space and underwater environment, the research on high-performance polarization control devices that suitable for visible light band has not been widely concerned. In this paper, a design concept for cross-talk free polarization control devices based on coupled mode theory has been illustrated, and several devices (including polarization splitters, polarization converters) have been given. Moreover, the design scheme and technical difficulties of polarization control devices in blue and green light band have also been evaluated.
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