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In this contribution a multiwavelength erbium ring laser is presented. The multiwavelength operation isachievedby using a novel in-line Mach-Zehnder (MZ) fibre interferometer based on multicore microstructured fibre (MC-MOF).The MZ interferometer acts as a periodic spectral filter. The modal properties of the MC-MOF are analysed using the finite difference method. Dual wavelength operation is demonstrated...
KGd(WO4)2 /(KGW) micro-crystalline powders, doped with selected rare earth (RE) ions, namely Ho3+, Er3+, Tm3+, Tb3+ and/or Yb3+ ions, were synthesized using modified Pechini method. RE doped KGW micro-crystalline powders exhibit multicolor up-conversion luminescence in the VIS and NIR spectral ranges under 975 nm laser diode excitation. The spectroscopic properties of KGW:RE3+ were investigated using...
We report on the inscription of Bragg gratings in a bioresorbable phosphate optical fiber using 193 nm excimer laser radiation and the phase mask technique. Bragg gratings with a typical 6 dB transmission strength were created over a length of 5 mm employing moderate inscription energy densities. The dissolution of the fiber, when immersed in phosphate buffered saline (PBS) solution, was studied through...
In this paper some preliminary results pertaining to the design and fabrication of rare-earth doped chalcogenide microresonators for lasing in mid-infrared (Mid-IR) wavelength range are illustrated. The unique properties of chalcogenide glass and the Whispering Gallery Mode (WGM) resonances make possible to obtain light emission via rare-earth transitions at long wavelengths. As example, a light source...
Surface Plasmon resonance (SPR) optical fibre biosensors appear as a cost-effective and relatively straightforward technique to yield in situ (or even possibly in vivo) macromolecular detection. The biosensor configuration reported in this work uses nanometric-scale gold-coated tilted fibre Bragg gratings (TFBGs) interrogated by light polarized radially to the optical fibre outer surface. Recently,...
Photonic technologies are becoming more and more necessary for data centre (DC) networks to meet the requirements of data transfer speed and energy saving. The use of optical hybrid wired/wireless solutions, where fibre links are coupled to free space optical links within the same DC facility can contribute to reduce the complexity of the network architecture and increase the efficiency of cooling...
Construction, preservation, maintenance, and renewal of sustainable and resilient civil structures and infrastructure represent important challenges for a 21st-century society. Structural Health Monitoring (SHM) is a novel approach which can successfully assist in meeting these challenges by providing actionable, quasi-real-time information regarding structural performance and health condition. Fibre...
We present the design of 8-channel, 100 GHz Si3N4 based AWGs applying our proprietary AWG-Parameters tool. This tool was already used in various silica based AWG designs and also technologically verified. The designed AWGs were simulated by two commercial photonics tools and the achieved transmission characteristics were evaluated. The AWGs were designed for TM-polarized light with a central wavelength...
In this invited paper, we experimentally demonstrate high spectral efficiency and large capacity featured free-space optical (FSO) transmission system by using LDPC coded quadrature phase shift keying (QPSK) combined with orbital angular momentum (OAM) multiplexing. The strong atmospheric turbulence channel is emulated by two spatial light modulators on which four randomly generated azimuthal phase...
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