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This article deals with the possibility of employing phase sensitive OTDR (Optical Time Domain Reflectometry) into fibers with active data transmission DWDM (Dense Wavelength Division Multiplex). Due to the low backscattered signal of phase sensitive OTDR is required to generate pulses with a high intensity and short time duration. These high power pulses can cause degradation of the data transmission. By using VPIphotonics software we performed the simulations investigating the influence of phase sensitive OTDR for quality DWDM connections and we are also interested in the wavelength spacing between sensoric system and data system. In our article it was verified that phase sensitive OTDR and data transmission can be active together in one optical fiber. If both systems work very close to each other it will lead to degradation of data transmission. We have verified that data transmission may be affected if power of pulses exceed 13 dBm.

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In this article the optical time division multiplexingtechnique for high speed point-to-point optical networksis discussed. We performed test of influence of selected types modulation formats in the optical time division multiplexing simulation model with a distance of 30 km. Additionally, this paper focuses on maximum bandwidth usage, improvement of bit error rate and the another goal is to achieve the maximal transmission distance by using of special compensation optical fiber. Optimal length of compensation optical fiber was found and used during simulations. We demonstrated positive influence compensation optical fiber on bit error rate. For comparisonof modulation formats such as return-to-zero, non-return-to-zero, chirped-return-to-zero, carrier-suppressed-return-to-zero, and m-ary quadrature amplitude modulation were tested. Our results confirm that it is possible to achieve better bit error rate for selected modulation formats.

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