Long-Reach Passive Optical Networks Russell P
JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 27, NO. 1, JANUARY 1 2009 1 Long-Reach Passive Optical Networks Russell P. Davey, Daniel B. Grossman, Senior Member, IEEE, Michael Rasztovits-Wiech, David B. Payne, Derek Nesset, Member, IEEE, A. E. Kelly, Albert Rafel, Shamil Appathurai, and Sheng-Hui Yang, Member, IEEE Abstract—This paper is a tutorial reviewing research and devel- opment performed over the last few years to extend the reach of passive optical networks using technology such as optical ampli- fiers. Index Terms—Communication systems, networks, optical am- plifiers, optical fiber communications. I. INTRODUCTION HE rapid growth of Internet access and services such as T IP video delivery and voice-over IP (VoIP) is accelerating Fig. 1. Typical configuration for B-PON, GE-PON, and G-PON. demand for broadband access. While most broadband services around the world are delivered via copper access networks, op- tical access technology has been commercially available for sev- eral years and is being deployed in volume in some countries [1]. Where optical access is deployed, passive optical networks (PONs) are often the technology of choice because the trans- mission fiber and the central office equipment can be shared by a large number of customers. Early PON deployments were based on B-PON systems as standardized in the ITU-T G.983 series. Fig. 2. Mid-span GPON extension. Currently being installed in Asian countries such as Japan are Ethernet PON (GE-PON) with gigabit transmission capability operation is made possible using wavelength division multi- that complies with IEEE 802.3ah. Meanwhile, operators in the plexing (WDM) with upstream wavelengths in the 1310 nm United States and Europe are now focusing on gigabit-capable region (1260–1360 nm) and downstream wavelengths in the G-PON systems as standardized in ITU-T G.984 series, with 1490 nm region (1480–1500 nm).
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