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Optical Networks A Practical Perspective

Upconversion of Yb3+/Ho3+ co-doped bismuth oxyfluoride and fluoride microcrystals for high-performance ratiometric luminescence thermometry

Optical thermometry based on ZnAl2O4:Eu3+ with carbon dots incorporation

In this work, a CaYF5:Ho3+/Yb3+ upconversion phosphor was synthesized and its structural, morphological, and optical properties were studied. The upconversion emission study was performed at an excitation pump power density of 5 W cm−2 and emissions at 544 nm, 650 nm and 747 nm due to the 5F4(5S2) → 5I8, 5F5 → 5I8 and 5F4(5S2) → 5I7 transitions of the Ho3+ ion, respectively were observed. From temperature-dependent upconversion spectra temperature sensitivity was calculated and sensitivity is found to be 14 × 10−3 K−1 for the synthesized upconversion phosphor. The photothermal conversion efficiency of the prepared sample in ethanol medium was tested. Moreover, the sample was used to develop latent fingerprints on various surfaces and good contrast in recorded images is observed. The invisible ink was prepared using the upconversion phosphor and then written words were recorded in upconversion emission mode.

Synthesis and upconversion emission studies of CaYF5:Ho3+/Yb3+ phosphor and its applications in optical thermometry, fingerprint detection, and security ink

Thermal sensing in NIR to visible upconversion of Ho3+ and Yb3+ doped yttrium oxyfluoride phosphor

Network emulation is an important tool before doing experiments on real-time hardware. In case of unavailability of test-bed for optical networks such simulation platform are of great help. Accounting for system virtualization, which is currently being supported by modern operating systems, we present architecture for optical virtual private network (OVPN) emulation platform. In OVPN, Quality of Service (QoS) decides the performance of communication system. To get more accurate QoS, various network and physical layer parameters are considered and based of the highest QoS value and a threshold, best route calculation is derived. So it is thought of interest to develop a network emulation platform for QoS based OPVN path evaluation of optical networks. This tool can help with the calculations and estimations of path, way prior to real-time implementations and deployments.

Pavani K

Papers

Thermal sensing in NIR to visible upconversion of Ho3+ and Yb3+ doped yttrium oxyfluoride phosphor

Design and Analysis of QoS based Optimized Novel Optical Network Emulator for WDM Technology