**1. Introduction**

Optical fiber sensors are classified as intensity, phase, polarization, and wavelength modulated sensors based on their operating principles [1]. Fiber Bragg grating (FBG) sensors are wavelength modulated sensors or sensors which detect physical parameter (strain, temperature, and others) based on wavelength changes. Fiber Bragg grating (FBG) technology typically is used in optical filters, dispersion compensation modules, and sensors solutions. FBG sensors are passive optical components with high sensitivity and immune to electromagnetic interference and radio frequency interference, which can be integrated into existing optical fiber network infrastructure for structural health monitoring (SHM) applications [2–4]. FBG sensors can be used for roads, tunnels, bridges, rails, aircrafts SHM, as well as civil engineering, security, oil, and gas solutions monitoring [5]. With FBG sensors, it is possible to monitor various physical parameters such as temperature, strain, vibration, pressure, humidity, etc. [6–8].

It is necessary to analyze sensor influence on deployed and operating fiber optical communications systems data channels before FBG sensors integration in this fiber optical network infrastructure. Optical sensors signal interrogation (OSSI) units maximal monitoring distance between monitoring equipment and FBG sensors can be longer than 40 km.

First, in this paper optical sensor and single–channel 10 Gbit/s transmission system compatibility and co-operation were experimentally evaluated in the fiber-optical transmission system (FOTS) laboratory of Riga Technical University, Communication Technologies Research Center (RTU SSTIC), as described in Section 2 of this article.

Further, we have also demonstrated the collaboration with 32-channel spectrum-sliced wavelength-division-multiplexing passive optical network (SS-WDM PON) data channels and FBG sensor network in the simulation environment, as described in Section 3 of this article. Results showed that the optical transmission system with SS-WDM PON data and FBG sensor channels is an energy and costefficient solution, because its transmitter part is realized using a single amplified spontaneous emission (ASE) light source.
