Abstract
We propose a multi-port, multi-wavelength supervisory system for the in-service transmission line monitoring of a bidirectional WDM-PON system. Identifying unique requirements for the performance monitoring of a real field WDM-PON system, we define the architecture for the supervisory system and utilize the most up-to-date technologies (Simplex coding, tunable source, and optical switches) to demonstrate a successful interrogation of a transmission line up to 16 ports x 32 nodes (512 user) capacity. Monitoring of individual branch traces up to 60 km was achieved with the application of a 127-bit simplex code corresponding to a 7.5dB SNR coding gain. In-service transmission experiments showed negligible penalty from the monitoring system to the transmission signal quality, at a 2.5Gbps / 125Mbps (down / up stream) data rate.
Highlights
Supporting the sudden rise of Internet data traffic, especially from the user’s end, the conversion of the previous subscriber network to fiber to the home (FTTH) is on the way in an aggressive manner
An FTTH solution based on a wavelength division multiplexed passive optical network (WDM-PON) has been the focus of significant attention because of its colorless system architecture, large bandwidth, inherent network security, and expansion capability to new transmission format / services [1, 2]
With its unique system architecture - supporting multi-port and multi-user / wavelength, the supervisory system for the WDM-PON application calls for a serious challenge - dictating requirements / specifications that are totally different from those of conventional OTDR (Optical Time Domain Reflectometry): I: with the large number of users / access lines to monitor, one have to counter the increase in the measurement time
Summary
Supporting the sudden rise of Internet data traffic, especially from the user’s end, the conversion of the previous subscriber network to fiber to the home (FTTH) is on the way in an aggressive manner. With its unique system architecture - supporting multi-port and multi-user / wavelength, the supervisory system for the WDM-PON application calls for a serious challenge - dictating requirements / specifications that are totally different from those of conventional OTDR (Optical Time Domain Reflectometry): I: with the large number of users / access lines to monitor, one have to counter the increase in the measurement time. Assuming a 16 port x 32 node WDM-PON architecture which we illustrate as an example in this work, this corresponds to a measurement time of less than an hour for the whole network, including 512 users, instead of a day. OTDR technique, based on the most up-to-date technologies such as simplex coding, tunable source, and an optical switch were applied to demonstrate fast and reliable interrogation of a transmission line up to the 16 port x 32 node (512 users) capacity. Monitoring of individual subscriber’s lines for short-reach and long-reach (total link ~ 60km, at 23dB dynamic range) nodes was demonstrated without any transmission penalty to the service traffics (2.5Gbps / 125Mbps: down / up)
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