**4. Conclusion**

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 BER level of 2 × 10−3.
