3 years ago

Colorless-Light and Tunable-Light-Source Schemes for TWDM and WDM PONs

Zhiguo Zhang, Shanyong Cai, Bingbing Zhang, Yanxu Chen, , Xue Chen, Min Zhang
The passive optical network (PON) has recently emerged as the most widely deployed and successful optical access solution. Data rate demands, driven by the growing use of broadband services, are expected to increase continuously over the next few decades. TWDM PONs and WDM PONs show the most promise for emerging broadband services involving various applications. In both TWDM and WDM PONs, a colorless light source or tunable transmitter is used on the ONU side and is indispensable for low-cost and plug-and-play ONUs. This article describes the principles of different colorless- light-source schemes and the architectures of the corresponding TWDM and WDM PON systems. Also, their transmission performances are analyzed and compared. Further, four types of wavelength control methods for light sources based on tunable laser diodes are described and analyzed. The features, characteristics, and applicability of the various colorless-light and tunablelight- source schemes are analyzed and compared.
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