Publications by authors named "Alexey N Guryanov"

5 Publications

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Compact and efficient O-band bismuth-doped phosphosilicate fiber amplifier for fiber-optic communications.

Sci Rep 2020 Jul 9;10(1):11347. Epub 2020 Jul 9.

G.G. Devyatyh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, Nizhny Novgorod, 603600, Russia.

During last decades there has been considerable interest in developing a fiber amplifier for the 1.3-[Formula: see text]m spectral region that is comparable in performance to the Er-doped fiber amplifier operating near 1.55 [Formula: see text]m. It is due to the fact that most of the existing fiber-optic communication systems that dominate terrestrial networks could be used for the data transmission in O-band (1260-1360 nm), where dispersion compensation is not required, providing a low-cost increase of the capacity. In this regard, significant efforts of the research laboratories were initially directed towards the study of the praseodymium-doped fluoride fiber amplifier having high gain and output powers at the desired wavelengths. However, despite the fact that this type of amplifiers had rapidly appeared as a commercial amplifier prototype it did not receive widespread demand in the telecom industry because of its low efficiency. It stimulated the search of novel optical materials for this purpose. About 10 years ago, a new type of bismuth-doped active fibers was developed, which turned out to be a promising medium for amplification at 1.3 [Formula: see text]m. Here, we report on the development of a compact and efficient 20-dB (achieved for signal powers between [Formula: see text] and [Formula: see text] dBm) bismuth-doped fiber amplifier for a wavelength region of 1300-1350 nm in the forward, backward and bi-directional configurations, which can be pumped by a commercially available laser diode at 1230 nm with an output power of 250 mW. The compactness of the tested amplifier was provided by using a depressed cladding active fiber with low bending loss, which was coiled on a reel with a radius of 1.5 cm. We studied the gain and noise figure characteristics at different pump and signal powers. A record gain coefficient of 0.18 dB/mW (at the pump-to-signal power conversion efficiency of above 27[Formula: see text]) has been achieved.
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http://dx.doi.org/10.1038/s41598-020-68243-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7347876PMC
July 2020

High-order mode suppression in double-clad optical fibers by adding absorbing inclusions.

Sci Rep 2020 Apr 28;10(1):7174. Epub 2020 Apr 28.

Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, 119333, Russia.

We proposed and experimentally demonstrated a technique for the suppression of unwanted modes in double-clad fibers with a high core-to-clad diameter ratio by introducing high-index absorbing inclusions into the first cladding of the fibers. These inclusions disturb the shape of undesirable modes, and a noticeable part of the power becomes localized inside the inclusion, resulting in an increase in the propagation loss of these modes. Two fiber designs were studied and realized: one with cylindrical symmetry and an absorbing high-index ring as the inclusion and another with high-index absorbing rods inserted around the fiber core. In both cases, the possibility of achieving perfect single-mode propagation was demonstrated both theoretically and experimentally.
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http://dx.doi.org/10.1038/s41598-020-63969-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188846PMC
April 2020

A 23-dB bismuth-doped optical fiber amplifier for a 1700-nm band.

Sci Rep 2016 06 30;6:28939. Epub 2016 Jun 30.

Fiber Optics Research Center of the Russian Academy of Sciences, 38 Vavilov str., Moscow 119333, Russia.

It is now almost twenty-five years since the first Erbium-Doped Fiber Amplifier (EDFA) was demonstrated. Currently, the EDFA is one of the most important elements widely used in different kinds of fiber-optic communication systems. However, driven by a constantly increasing demand, the network traffic, growing exponentially over decades, will lead to the overload of these systems ("capacity crunch") because the operation of the EDFA is limited to a spectral region of 1530-1610 nm. It will require a search for new technologies and, in this respect, the development of optical amplifiers for new spectral regions can be a promising approach. Most of fiber-optic amplifiers are created using rare-earth-doped materials. As a result, wide bands in shorter (1150-1530 nm) and longer wavelength (1600-1750 nm) regions with respect to the gain band of Er-doped fibers are still uncovered. Here we report on the development of a novel fiber amplifier operating in a spectral region of 1640-1770 nm pumped by commercially available laser diodes at 1550 nm. This amplifier was realized using bismuth-doped high-germania silicate fibers fabricated by MCVD technique.
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http://dx.doi.org/10.1038/srep28939DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4928042PMC
June 2016

Luminescence and optical gain in Pb-doped silica-based optical fibers.

Opt Express 2009 Aug;17(16):13487-92

Fiber Optics Research Center of Russian Academy of Sciences, 119333 Moscow, Russia.

IR luminescence and optical gain in a Pb-doped fiber have been observed for the first time. Absorption, luminescence and pump on/pump off optical gain spectra, as well as luminescence decay time, have been measured in these fibers. Comparison of optical active center characteristics in Pb-doped and Bi-doped fibers of the same composition indicates an essential difference of optical active centers in these two types of fibers.
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http://dx.doi.org/10.1364/oe.17.013487DOI Listing
August 2009

Bi-doped fiber lasers and amplifiers for a spectral region of 1300-1470 nm.

Opt Lett 2008 Oct;33(19):2227-9

Fiber Optics Research Center, Russian Academy of Sciences, Moscow, Russia.

Bismuth-doped fiber lasers operating in the range 1300-1470 nm have been demonstrated for the first time, to our knowledge. It has been shown that Bi-doped alumina-free phosphogermanosilicate fibers reveal optical gain in a wavelength range of 1240-1485 nm with pumping at 1205, 1230, or 808 nm.
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http://dx.doi.org/10.1364/ol.33.002227DOI Listing
October 2008