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Coexistence and Compatibility with XGS-PON vs XG PON vs GPON
ITU-T G.984 and G.988 respectively define the standards for GPON and XG PON/XGS PON, including provisions for coexistence. By adhering to these standards, G-PON compatibility via a wavelength plan, blocking filters, loss budget for coexistence on a common ODN, and a combo OLT
Wavelength Compatibility:
ITU-T G.984 and G.988 define the standards for GPON and XG PON/XGS PON respectively, and include coexistence provisions. XG-PON and XGS-PON have a downstream wavelength of 1577nm and an upstream wavelength of 1270nm, so they naturally support mixed access without the need for additional wavelength isolation; however, GPON has different wavelengths (downstream 1490nm/upstream 1310nm), so wavelength division multiplexing (WDM) is required to work simultaneously on the same optical fiber without interfering with each other. To achieve coexistence.
