Optical performance monitoring (OPM) is considered as an important tool in order to operate and manage dynamic, flexible, and thus complex photonic networks. In this paper, firstly we review recent studies on OPM and discuss its possible applications, such as failure diagnosis of transmitter, receiver, and other transport equipment, optimization of system reach design, and so on. We then present two different types of in-band OSNR monitor, consisting of an optical bandpass filter, a photo-detector, and a signal processer. Since the proposed monitor might be realized by the same hardware implementation as an optical channel monitor (OCM), this is potentially integrated with an OCM in a low-cost fashion. We also explain a BER monitor, which is realized by the same hardware configuration as the above in-band OSNR monitor. The BER in the method is estimated by monitoring OSNR including nonlinear noise as noise source and taking the imperfection of Tx, Rx, and other equipment into account. Finally we develop FPGA-based optical performance monitor prototype and experimentally demonstrate successful monitoring performance.
We propose distributed Raman amplifiers (DRAs) for optical add/drop multiplexing (OADM) networks in order to suppress optical surges due to add/drop multiplexing. We confirmed that the fast transient characteristic of distributed Raman amplifier realizes no surviving channel degradation under add/drop power fluctuation condition as well as fine band upgradability to support "pay-as-you-grow" feature. And we also propose some application in metro area network by using DRAs.
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