Chuanbiao Zhang

Ultrasensitive temperature fiber sensor based on Fabry-Pérot interferometer assisted with iron V-groove.

A fiber extrinsic Fabry-Pérot interferometer (EFPI) assisted with iron V-groove for temperature measurement is proposed and investigated by means of both numerical simulation and experiment for the first time to our best knowledge. The main temperature sensing component is acted by the iron V-groove whose coefficient of linear thermal expansion (CLTE) is much higher than that of the silica glass. Two fibers are stuck to the V-groove with two glued points, respectively. Maximum sensitivity of 260.7 nm/°C, which is the highest value for a fiber interferometric sensor up to now, has been achieved experimentally. It is worth noting that the temperature sensitivity of this sensor can be improved limitlessly via implementing a smaller gap size of the EFPI, longer distance between the two glued points or material with higher CLTE of the V-groove, theoretically.

Fiber-Optic Laser Sensor Based on All-Fiber Multipath Mach–Zehnder Interferometer

A novel fiber-optic sensor using fiber ring cavity laser based on multipath Mach-Zehnder interferometer (m-MZI) is proposed and experimentally demonstrated. The m-MZI consists of a segment of four-core fiber (FCF) spliced between two single-mode fibers. The m-MZI is inserted in the fiber ring laser cavity, which acts as a bandpass filter and the sensing component simultaneously. Compared with previously reported MZI, higher phase sensitivity can be obtained in the proposed m-MZI due to the multipath interference configuration embedded in one fiber. The interference fringe of the FCF would shift with the variation of monitoring parameters and then caused the lasing wavelength changes. So it is available to measure these parameters by simply monitoring the variation of lasing wavelength. Experimental results show that the sensitivities of the sensor in strain, RI, and curvature are 2.21 pm/με, 113.27 nm/RIU, and 2.55 nm/m-1, respectively. Thus, the proposed sensor is easy to conduct and monitor, in addition, it also has the advantages of high resolution and high signal-to-noise ratio.

Millimeter- and terahertz-waves generation with photonic frequency 32-tupling based on tunable lasers

Abstract. We propose and analyze a frequency 32-tupling scheme which is capable of generating millimeter and terahertz waves without being affected by the phase noise difference between two incoherent sources. In our work, the process of the optical sidebands’ phase noise change is theoretically analyzed and confirmed by simulations. In addition, the system performance in terms of linewidth, tunability, and stability is also investigated.