**Data availability**

The data used to support the findings of this study are available from the first author upon request.

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**Author details**

Janis Braunfelds1

Riga, Latvia

\*, Sandis Spolitis1

\*Address all correspondence to: janis.braunfelds@rtu.lv

provided the original work is properly cited.

, Jurgis Porins2

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

1 Riga Technical University, Communication Technologies Research Center,

2 Riga Technical University, Institute of Telecommunications, Riga, Latvia

and Vjaceslavs Bobrovs2

*Fiber Bragg Grating Sensors Integration in Fiber Optical Systems*

*DOI: http://dx.doi.org/10.5772/intechopen.94289*

*Fiber Bragg Grating Sensors Integration in Fiber Optical Systems DOI: http://dx.doi.org/10.5772/intechopen.94289*

*Application of Optical Fiber in Engineering*

The 3rd data channel provided the lowest performance of the combined system (SS-WDM-PON data channels and FBG sensor network). Measured BER versus received signal power, known as BER correlation diagram, for SS-WDM-PON system with and without integrated FBG temperature sensing network is shown in **Figure 11**. BER correlation diagram is measured for the worst-performing (in terms

As we can see in the measured BER versus received signal power (**Figure 11**) graph, the FBG influence on SS-WDM-PON transmission data channels is minimal. FOTS system power reserve is 19.5 dB at the pre-FEC BER level of 2 × 10−3 [15]. The measured BER value of back-to-back (BTB) systems with SS-WDM PON data channels and FBG sensor network is 3.72 × 10−7, but for back-to-back (BTB) system 1.65 × 10−7. Based on the measured results, the calculated power penalty value (compared SS-WDM-PON system with and without integrated FBG temperature sensors

In this research, we successfully demonstrated FBG temperature sensor integration in FOTS experimentally, but the combined system with FBG temperature sensor network and 32-channel spectrum-sliced wavelength-division-multiplexing passive optical network were realized in the simulation environment. The simulation model is based on one shared amplified spontaneous emission source. As shown in **Figures 9** and **11**, FBG sensors do not degrade data channel signal quality. The measured BER value for the worst channel of a back-to-back (BTB) systems with SS-WDM-PON data channels and FBG sensor network is 3.72 × 10−7, but for BTB system 1.65 × 10−7. The FOTS systems power reserve is 19.5 dB at the pre-FEC

This work is supported by the European Regional Development Fund project

The data used to support the findings of this study are available from the first

of BER) channel of the SS-WDM PON data transmission system.

network) is 0.5 dB at the pre-FEC BER level 2 × 10−3.

**4. Conclusion**

BER level of 2 × 10−3.

**Acknowledgements**

**Conflict of interest**

**Data availability**

author upon request.

No. 1.1.1.3/18/A/001, PVS 3912.6.2.

The authors declare no conflict of interest.

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