C Currently and in the future, Indonesia is now and is in the process of going to a digital country(Indonesia Digital Nation) where one of the indicators is the number of new start-ups (Start-Up)and also the many access to online applications that use telecommunications networks (where thisis also applies to large, medium, and small companies). The definition of Digital Nation itselfactually covers almost all aspects of life, especially using Smart Systems, for example, ElectronicMoney (E-Money), Electronic Commerce (E-Commerce), Electronic Education (E-Education),Electronic Learning (E-Learning), Electronic Trading (E-Trading), Electronic Transportation (ETransportation), Smart Home, Smart Office, Big Data. Whereas in terms of industrialization itself,it has now begun to shift from the 3.0 Industrial Revolution to the 4.0 Industrial Revolution, andit is possible that in the future it will lead to the 5.0 Revolution where the industrial revolution hashad a significant impact and change for mankind with the emergence of artificial intelligence (AI)technology, and the Internet of Things (IoT).One of the solution to implementing IDN is to build an evenly distributed backbone optical cablenetwork infrastructure in Indonesia, in this case the East Kalimantan province. The method usedto design and build an optical cable backbone infrastructure network that uses Dense WavelengthDivison Multiplexing (DWDM) technology and Optical Transport Network (OTN). The steps arecarried out by collecting map data for the East Kalimantan, followed by using software namelyGoogle Map to measure and map the distance and path that will be traversed by the optical cablein the land area, while the Google Earth Pro software is used to map and measure pathways whichcannot addresed by Software Google Map. OTN Planner software is used to design DWDM andOTN device designs and simulate the backbone network design while calculating the value of theOptical Link Power Budget (OLPB) and Optical Signal Noise Ratio (OSNR) from the networkdesigns that have been made.The results of the research in the form of design and simulation obtained an optical cable Backbonenetwork design in the province of East Kalimantan which has OLPB calculation results getting anideal value of <50 dBm, and the OSNR value ranging from 20 dBm - 40 dBm. Both from theexample of the calculation results of the ONSR site segment manually and or using software thereis only a slight difference (0.01 and 0.15 dB). In addition, the Optical Land Amplifier (OLA) siteis also added, which functions to keep the OLPB and OSNR values below 50 dBm. From thesimulation results, it can also be found that the margin value for the segment system is> 7dB,which means that the backbone infrastructure network designed is very feasible to implementbecause it has quite good reliability.