title: In-service monitoring of 16 port x 32 wavelength bi-directional WDM-PON systems with a tunable, coded optical time domain reflectometry.
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.
authors: Jeonghwan
authors: J
authors: Lee
authors: Jonghan
authors: J
authors: Park
authors: Jae Gwang
authors: JG
authors: Shim
authors: Hosung
authors: H
authors: Yoon
authors: Jin Hee
authors: JH
authors: Kim
authors: Kyoungmin
authors: K
authors: Kim
authors: Jae-Oh
authors: JO
authors: Byun
authors: Namkyoo
authors: N
authors: Park