WAVELENGTH REFERENCING IN PASSIVE OPTICAL NETWORKS

摘要

In a passive optical network.upstream wavelength multiplexing of customer lasers to provide two-way services and wavelength-switched connections will require accurate referencing of transmitted wavelengths,particularly for high-density multiplexing.A method is demonstrated that uses the HDWDM channels transmitted from a head-end as a reference comb for upstream transmission.A dual-purpOse,grating-based tunable optical filter simultaneously selects the required downstream wavelength channel,while automatically generating an identical wavelength as part of a tunable ring laser.This enables all customers to employ identical amplifiers,without requiring a set of distinct laser wavelengths to be accurately manufactured.