scholarly journals Reflectometry Study of the Pyroelectric Effect on Proton-Exchange Channel Waveguides in Lithium Niobate

2021 ◽  
Vol 11 (21) ◽  
pp. 9853
Author(s):  
Roman Ponomarev ◽  
Yuri Konstantinov ◽  
Maxim Belokrylov ◽  
Ivan Lobach ◽  
Denis Shevtsov
Keyword(s):  
Lithium Niobate ◽  
Optical Waveguides ◽  
Lithium Niobate Crystal ◽  
Proton Exchange ◽  
Optical Losses ◽  
Pyroelectric Effect ◽  
Optical Frequency Domain Reflectometry ◽  
Exchange Channel ◽  
Frequency Domain Reflectometry ◽  
Channel Waveguides

This work is devoted to the study of the pyroelectric effect on the properties of optical waveguides formed in a lithium niobate crystal by proton exchange. In the present work, we studied the cessation effect of the radiation channeling during thermocycling of Y-splitters samples. We examined the spectral dependence of optical losses on the wavelength using an optical spectrum analyzer. The results demonstrate that in the range of 1530–1570 nm, all wavelengths are suppressed equally. The optical frequency domain reflectometry shows that the increase of optical losses is observed along the entire waveguide, but not only at the Y-splitting point, as supposed earlier.

scholarly journals Reflectometry Study of the Pyroelectric Effect on Proton-Exchange Channel Waveguides in Lithium Niobate

2021 ◽  
Author(s):  
Roman Ponomarev ◽  
Yuri Konstantinov ◽  
Ivan Lobach ◽  
Maxim Belokrylov ◽  
Denis Shevtsov
Keyword(s):  
Lithium Niobate ◽  
Optical Waveguides ◽  
Lithium Niobate Crystal ◽  
Proton Exchange ◽  
Optical Losses ◽  
Pyroelectric Effect ◽  
Exchange Channel ◽  
Distribution Point ◽  
Optical Reflectometry ◽  
Channel Waveguides

This work is devoted to the study of the pyroelectric effect on the qualities of optical waveguides formed in a lithium niobate crystal by proton exchange. In the present work, we investigated the cessation effect of the radiation channeling during thermocycling of Y-splitters samples. We examined the spectral dependence of optical losses on a wavelength using an optical spectrum analyzer. The results demonstrate that in the range of 1530–1570 nm, all wavelengths are suppressed equally. The optical reflectometry method in the frequency domain shows that the increase of optical losses is observed along the entire waveguide, but not only at the Y-distribution point, as supposed earlier.

scholarly journals “Shutdown” of the Proton Exchange Channel Waveguide in the Phase Modulator under the Influence of the Pyroelectric Effect

2019 ◽  
Vol 9 (21) ◽  
pp. 4585
Author(s):  
Roman Sergeevitch Ponomarev ◽  
Denis Igorevitch Shevtsov ◽  
Pavel Victorovitch Karnaushkin
Keyword(s):  
Lithium Niobate ◽  
Integrated Circuit ◽  
Lithium Niobate Crystal ◽  
Rapid Heating ◽  
Proton Exchange ◽  
Navigation Systems ◽  
Radiation Mode ◽  
Exchange Channel ◽  
Channel Waveguides ◽  
Fundamental Radiation

It is shown that the termination of the channeling of the fundamental radiation mode in the waveguide can be observed upon heating of an optical integrated circuit based on proton exchange channel waveguides formed in a lithium niobate single crystal. This process is reversible, but restoration of waveguide performance takes tens of minutes. The effect of the waveguide disappearance is observed upon rapid heating (5 K/min) from a low temperature (minus 40 °C). This effect can lead to a temporary failure of navigation systems using fiber optic gyroscopes with modulators based on a lithium niobate crystal.

scholarly journals "Shutdown" of the Proton Exchange Channel Waveguide in the Phase Modulator under the Influence of the Pyroelectric Effect

2019 ◽  
Author(s):  
Roman Ponomarev ◽  
Denis Shevtsov ◽  
Pavel Karnaushkin
Keyword(s):  
Lithium Niobate ◽  
Integrated Circuit ◽  
Lithium Niobate Crystal ◽  
Rapid Heating ◽  
Proton Exchange ◽  
Navigation Systems ◽  
Radiation Mode ◽  
Exchange Channel ◽  
Channel Waveguides ◽  
Fundamental Radiation

It is shown that the termination of the channeling of the fundamental radiation mode in the waveguide can be observed upon heating of an optical integrated circuit based on proton exchange channel waveguides formed in a lithium niobate single crystal. This process is reversible, but restoration of waveguide performance takes tens of minutes. The effect of the waveguide disappearance is observed upon rapid heating (5 °C/min) from a low temperature (minus 40 °C). This effect can lead to a temporary failure of navigation systems using fiber optic gyroscopes with modulators based on a lithium niobate crystal

Fabrication and Characterisation of Reverse Proton Exchange Optical Waveguides in Neodymium Doped Lithium Niobate Crystals

2005 ◽  
Vol 480-481 ◽  
pp. 429-436
Author(s):  
M. Domenech ◽  
G. Lifante ◽  
F. Cussó ◽  
A. Parisi ◽  
A.C. Cino ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Optical Waveguides ◽  
Spectroscopic Properties ◽  
Proton Exchange ◽  
Fabrication Process ◽  
The Other ◽  
Ion Plating ◽  
Other Hand ◽  
Channel Waveguides ◽  
Lithium Niobate Crystals

In this work, the complete fabrication process which combines Proton Exchange (PE) and Reverse Proton Exchange (RPE) in Neodymium doped LiNbO3 channel waveguides is reported. To produce the PE-RPE channel waveguides the fabrication of dielectric SiO2 masks had to be implemented. For this propose, we adopted a technique based on the Ion Plating Plasma Assisted Deposition of SiO2 followed by the standard ultraviolet photolithographic patterning. On the other hand, we determined the main optical and spectroscopic properties of Nd3+ ions in the channel waveguides including the study of the lifetime as function as the polarisation.

scholarly journals Investigation of Side Wall Roughness Effect on Optical Losses in a Multimode Si3N4 Waveguide Formed on a Quartz Substrate

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 104
Author(s):  
Anastasia Yakuhina ◽  
Alexey Kadochkin ◽  
Vyacheslav Svetukhin ◽  
Dmitry Gorelov ◽  
Sergey Generalov ◽  
...  
Keyword(s):  
Optical Waveguides ◽  
Quartz Substrate ◽  
Side Wall ◽  
Wall Roughness ◽  
Roughness Parameters ◽  
Optical Losses ◽  
Waveguide Width ◽  
Integration Density ◽  
Frequency Domain Reflectometry ◽  
Multimode Operation

This article presents the results of the study of the influence of the most significant parameters of the side wall roughness of an ultra-thin silicon nitride lightguide layer of multimode integrated optical waveguides with widths of 3 and 8 microns. The choice of the waveguide width was made due to the need to provide multimode operation for telecommunication wavelengths, which is necessary to ensure high integration density. Scattering in waveguide structures was measured by optical frequency domain reflectometry (OFDR) of a backscattering reflectometer. The finite difference time domain method (FDTD) was used to study the effect of roughness parameters on optical losses in fabricated waveguides, the roughness parameters that most strongly affect optical scattering were determined, and methods of its significant reduction were specified. The prospects for implementing such structures on a quartz substrate are justified.

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