Influence of Two-Frequency Radiation Intensity Fluctuations on the Output Signal of a Vortex Optical Fiber Forming OAM Address in Polyharmonic Sensor Technology

Photonics

卷:8

Ildaris Gabdulkhakov¹  Oleg Morozov¹  Irina Vinogradova²  Albert Sultanov²  Azat Gizatulin²  Ivan Meshkov²  Valery Bagmanov²  Sofia Ganchevskaya³  Nikolay Kazanskiy³ 

[1] Department of Radiophotonics and Microwave Technologies, Kazan National Research Technical University Named after A.N. Tupolev-KAI, 10, Karl Marx Street, 420111 Kazan, Russia;

[2] Department of Telecommunication Systems, Ufa State Aviation Technical University, K. Marxa 12, 450000 Ufa, Russia;

[3] IPSI RAS—Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001 Samara, Russia;

关键词: fiber Bragg gratings;    chiral structures;    orbital angular momentum;    apodization;    chirp;    radio-over-fiber;   

DOI  :  10.3390/photonics8090351

来源: DOAJ

【 摘 要 】

A schematic diagram of a RoF radio-optic system with vortex signals is presented, in which the radio frequency is determined by the difference between the wavelengths of two lasers. It is assumed that the generation of a vortex signal can be performed through a vortex fiber-optic periodic structure, which can be obtained using a technology similar to the manufacture of long-period fiber Bragg gratings. The parameters of the grating are modeled assuming that the fundamental light-guide mode (LP01) is applied to the specified vortex element, and the higher-order mode (LP11) is reflected. It was found that the distortion of the vortex signal can be reduced by introducing apodization and chirping of this periodic structure. The following optimal parameters have been estimated: the apodization and chirp multiplier functions, at which the distortions of the amplitude and phase of the vortex signal, as well as the appearance of an unwanted angle distortion, will be minimal. It is shown that such gratings can be exploited in addressed sensors systems using the orbital angular momentum (OAM) of a lightwave as a unique sensor address.

【 授权许可】

Unknown