Study of the influence of reflectometer pulses on coherent DWDM channels

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Abstract

It is observed that the reflectometer pulse affects the accompanying DWDM signal due to the forced Raman scattering (FRS) effect. It is found that in coherent links it is important to consider both the attenuation of DWDM signal power and the rate at which this occurs, as both can cause short-term loss of traffic on the link. To take them into account, a dynamic model – an exact solution of the system of rate equations describing the DWDM interaction – was implemented.

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About the authors

I. K. Yakushin

компания "Т8"; МГУ имени М.В. Ломоносова

Author for correspondence.
Email: iakushin@t8.ru

инженер; студент физического факультета

Russian Federation

A. S. Remizova

Группа компаний "Т8"

Email: iakushin@t8.ru

руководитель

Russian Federation

L. A. Samodelkin

Компания "Т8"

Email: iakushin@t8.ru

инженер

Russian Federation

D. D. Starykh

Компания "Т8"

Email: iakushin@t8.ru

заместитель начальника отдела

Russian Federation

O. E. Nanii

Компания "Т8"; МГУ имени М.В. Ломоносова

Email: iakushin@t8.ru

д.ф.-м.н., начальник научного отдела; проф.

Russian Federation

V. N. Treshchikov

Компания "Т8"

Email: iakushin@t8.ru

д.т.н., генеральный директор

Russian Federation

References

  1. Grinstein V. and Venter M. In-Service OTDR Monitoring and Mitigating the Effects of Raman Scattering [Электронный ресурс]. URL: https://www.lightwaveonline.com/test/network-test/article/16667976/in-service-otdr-monitoring-and-mitigating-the-effects-of-raman-scattering (дата обращения 03.12.2024).
  2. Kjeldsen P.M., Obro M. et al. SRS induced depletion of 1540 nm signal co propagating with 1630 nm OTDR pulses // Electronics Letters. 1996. Vol. 32. No. 20. 1996. PP. 1914–1916.
  3. Headley C., Agrawal G.P. Raman Amplification in Fiber Optical Communication Systems. Cambridge, MA: Academic Press, 2005. 374 p.
  4. Самарский А.А. Введение в теорию разностных схем. М.: Наука, 1971. 552 с.

Supplementary files

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2. Fig. 1. Graph of the dependence of the normalized Raman gain coefficient created by radiation with a wavelength of 1625 nm on the wavelength for a standard single-mode fiber. In the wavelength range shorter than 1625 nm, the gain is negative

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3. Fig. 2. Schematic diagram of the experimental setup

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4. Fig. 3. Signal on the oscilloscope from the photodetectors at the moment of the OTDR pulse with a duration of 20 μs. Orange is the DWDM channel 1537.4 nm (right axis), blue is the OTDR at a wavelength of 1625 nm (left axis)

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5. Fig. 4. Normalized OTDR pulse measured using a high-frequency photodetector and an oscilloscope

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6. Fig. 5. Comparison of the results obtained using the quasi-stationary model calculation with the experimental results

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7. Fig. 6. Comparison of signal powers at a distance of 100 km, obtained in the stationary approximation and with an exact solution of equations (1)

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8. Fig. 7. Signal depletion profile shape at 100 km distance obtained using the dynamic model

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Copyright (c) 2024 Yakushin I.K., Remizova A.S., Samodelkin L.A., Starykh D.D., Nanii O.E., Treshchikov V.N.