LightCounting released the PON Optical Distribution Network (ODN) Digitization industry report, defining the development of three generations of ODN technology. Recently, LightCounting, an authoritative analysis organization in the communications industry, released the PON Optical Distribution Network (ODN) Digitization industry report (hereinafter referred to as the white paper), which analyzed the development of ODN networks, defined the three generations of ODN technology, and looked forward to the future development of optical fiber technology. Figure 1: LightCounting released the PON Optical Distribution Network (ODN) Digitalization industry report white paper, which reviews the evolution and development of fixed broadband (FBB) technology in different transmission media, and reiterates that fiber-to-the-home (FTTH) is the current mainstream FBB solution. As the most important component of FTTH, the innovations that have emerged in ODN in recent years are gratifying. The white paper defines the ODN technology generation for the first time. LightCounting pointed out that the development of ODN technology has gone through three generations. The first generation of ODN (traditional ODN) relies on a large amount of fiber cutting and splicing, which has low construction efficiency and requires high skills and tools for construction personnel. The second-generation ODN has been deployed on a large scale since 2015. The more typical solutions are pre-connected ODN developed by Huawei, Corning, and CommScope. The biggest advantage of this generation of ODN is that the site does not require splicing. All optical fibers have been spliced and tested before leaving the factory, and packaged into sealed boxes. Therefore, when the site is deployed, plug and play installation can be achieved. At the same time, because the technical requirements are significantly reduced and the installation is not affected by the external environment of the site, the deployment efficiency is greatly improved and the construction quality is more stable. For the second generation ODN, the European Telecommunications Standards Institute (ETSI) released the TR 103 775 standard in August 2021. The second generation ODN solution is also called QuickODN solution in the industry. The latest third-generation ODN technology and solutions (ODN3) are also defined in the white paper. Since optical fiber is not conductive, traditional ODN networks are passive and cannot achieve digital management. Although the installation efficiency of the second generation ODN has been greatly improved compared to the first generation, the progress of digitization and automation of ODN networks has been slow over the past decade. In recent years, with the emergence of innovative digital ODN solutions, ODN technology is constantly becoming digital and intelligent. The white paper focuses on Huawei's Fiber Iris solution. Unlike other solutions based on OTDR (Optical Time Domain Reflectometer) technology to achieve optical path scanning and fault diagnosis, Huawei's DQ ODN solution is based on optical iris technology and cleverly utilizes the optical microstructure of the 1xN optical splitter in ODN to introduce unique differential phase changes in the optical signal, realizing the intelligence of passive optical devices. The optical iris solution consists of Huawei Cloud Management Platform (NCE), OAI (phase receiving module) board, OSU (optical switch) and optical iris splitter. This solution can automatically detect the link status and network faults of optical cables and accurately locate the fault point with a fault location error within 2 meters. Figure 2: Huawei DQ ODN optical iris solution networking schematic The emergence of third-generation ODN has injected vitality into the ODN industry and greatly enhanced the inherent shortcomings of FBB fiber access. It is believed that more amazing optical fiber intelligent technologies will appear in the future, promoting the informatization, digitization and automation process of human society