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2 Acta Physica Polonica A

2 2018

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Eight-Channel Optical Add Drop Multiplexer Based on Ring Resonator Using LNOI Channel Waveguides

100%

Kumar H. , Janyani V. , Buryy O. , Ubizskii S. , Sugak D. , Singh G.

Acta Physica Polonica A

2018

tom 133

nr 4

997-999

In this paper we report on an eight-channel optical add drop multiplexer based on ring resonator using lithium niobate on insulator channel waveguides. It is suitable for a DWDM-GPON network with channel spacing of 100 GHz in C-band and data rate is 10 Gbps. The insertion loss at the drop port is maximum 1.2 dB and the Q-factor is 1636. It can be used as multiplexer as well as demultiplexer in 8-channel DWDM systems.

Optical Investigation of the Cu Ions Diffusion into Bulk Lithium Niobate

67%

Sugak D. , Syvorotka I. , Yakhnevych U. , Buryy O. , Martynyuk N. , Ubizskii S. , Zhydachevskyy Y. , Suchocki A. , Kumar H. , Janyani V. , Singh G.

Acta Physica Polonica A

2018

tom 133

nr 4

965-972

Spatial changes of optical properties of bulk LiNbO₃ crystal were investigated after annealing in CuO powder. The incorporation of copper ions into the crystal was confirmed by registration of additional absorption spectra that revealed formation of the absorption bands of both Cu⁺ (400 nm) and Cu²⁺ (1000 nm) ions. The changes of optical absorption caused by thermal treatment were registered along the direction of diffusion by the probe beam perpendicular to this direction. The anisotropy of diffusion was revealed. The maxima were observed on the depth dependences of additional absorption both for the wavelengths of 400 and 1000 nm for all main crystallographic directions. The concentrations of copper ions were calculated in accordance with the Smakula-Dexter formula. The X-ray diffraction study revealed reflexes which probably belong to CuNb₂O₆, CuNbO₃ and CuO. The halo was observed on these diffraction patterns that confirms the formation of the scattering centers (about 1 nm in diameter) in the near-surface region.