25G/50G-EPON Standard Crosses the Finish Line — Enhancing Fiber Deployments as Part of Cable’s 10G Platform

Key Features of 25G/50G-EPON

  • Peak Capacity: As the name implies, the new EPON standard developed by the IEEE 802.3ca Task Force allows for symmetric or asymmetric operation with downstream speeds of 25 Gbps or 50 Gbps, and upstream speeds of 10 Gbps, 25 Gbps, or 50 Gbps. These peak capacities are more than capable of meeting the 10 Gbps symmetric service tier goals set forth in the 10G Platform. Achieving this increase in capacity is accomplished in two ways: (1) expanding the transmission rate to 25 Gbps per wavelength and (2) leveraging wavelength division multiplexing technology to add an additional wavelength. A benefit of this architecture is that service providers can initially deploy a single wavelength providing 25 Gbps, and then add a second wavelength to bring the total to 50 Gbps upon demand.
  • Coexistence: An important consideration for service providers is the ability to support coexistence with legacy PON technologies, specifically 10 Gbps PON. Briefly, coexistence enables reuse of existing PON infrastructure by easily adding additional capacity while avoiding the complete removal of legacy PON technology. For 25G/50G-EPON, service providers who have already deployed 10G PON solutions are able to add one or more 25 Gbps wavelengths to bring total capacity to 35 Gbps or 60 Gbps in total over the same PON infrastructure. Various coexistence scenarios are shown in the diagram below.

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