Development of fiber Bragg gratings technology and their complex structures for sensing, telecommunications and microwave photonics applications

Abstract

Abstract. In this paper research on the development of the fiber Bragg grating (FBG) technology which has been conducted at the Institute of Electronic Systems (IES), Warsaw University of Technology (WUT) since 2004 is presented. In particular the directions in the development of advanced set-ups employing the phase mask inscription scheme are discussed and supported with the descriptions of structures designed and fabricated with the use of the laboratory stages constructed at the IES. The novelty of the presented solutions is based on the combination of numerous techniques of the external modification of the interferometric patterns (projected onto cores of photosensitive fibers to modulate their refractive index) as well as application of the modification of the internal properties of the waveguides themselves by the means of introducing strain or tapering.The development of these sophisticated set-ups resulted in the inscription of FBGs with precisely designed spectral characteristics which found application in telecommunications and sensor technology are also illustrated here.The paper is summarized with the specification of the most important achievements attained at the lab and drafting of the possible directions of further research.

Numerical and Experimental Performance Analysis of the Chirped Fiber Bragg Grating Based Abrasion Sensor for the Maintenance Applications in the Industry 4.0

“…Such a simple method for measuring the spectral width of the grating, that can be easily employed in the microprocessor unit, does not take into account the issue of the physical nature of the chirped Bragg grating written in the fiber. Namely, when the total length of the CFBG is lower than several values related to the chirp of the grating, the nature of the quasi-uniformity is revealed [31,32]. In turn, for this region, the relation between spectral width and the length of the grating ceases to be monotonic, and the precision of the sensor drops.…”

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…The electromagnetic shutters are used to block the light beam [1], modulate or sample the optical signal [2][3][4]. Due to the application of a mechanical shield, the device can be applied as a protection in the optical path [5] where a light beam of up to several dozen watts is propagated.…”

Power modulated temperature sensor with inscribed fibre Bragg gratings

“…Inscription of fibre Bragg gratings has been used for the purposes of wavelength division multiplexing [2], compensation chromatic disper− sion [3], and erbium doped fibre amplifier gain stabilization [4]. Nowadays, FBGs are also increasingly utilized in micro− wave photonics applications [5][6][7]. Nevertheless, they are applicable not only in high−performance telecommunication devices, but also in optical sensor systems.…”