321 Tb/s E/S/C/L-band Transmission with E-band Bismuth-Doped Fiber Amplifier and Optical Processor

Using a newly developed bismuth doped fiber amplifier operating across the E-band and a multi-port optical processor, we investigate wideband E/S/C/L-band transmission with signal bandwidths up to 27.8 THz and distances up to 200 km. Dense wavelength-division multiplexed (D-WDM) transmission is enabled by using a combination of thulium, erbium and bismuth doped-fiber amplifiers in combination with distributed Raman amplification. For 50 km transmission, we transmit a wideband DWDM signal comprising 1097 channels covering 212.3 nm (27.8 THz) from 1410.8 nm to 1623.1 nm for a record single-mode fiber (SMF) data-rate of 321 Tb/s (301 Tb/s after decoding), an increase of 25% on the previous record data-rate. We further show single span transmission at 100 km and 150 km before recording 270.9 Tb/s (258.1 Tb/s after decoding) for 200 km transmission over 2 amplified spans. These results show the potential of E-band transmission, to increase the information carrying capability of optical fibers and open the door to multi-band fiber networks built on already deployed fibers

Advanced DSP-based Monitoring for Spatially resolved and Wavelength-dependent Amplifier Gain Estimation and Fault Location in C+L-band Systems

The development of efficient anomaly detection schemes is a key element for the implementation of autonomous optical networks as they can help telecom operators to automate the location of defective devices and track the overall performance of the network infrastructure. In that regard, the exploitation of receiver based digital signal processing (DSP) for optical performance monitoring has shown to be a promising enabler for detection of spatially resolved and wavelength-dependent properties and anomalies in optical fiber links. In this work, we study the benefits of applying DSP-based longitudinal power estimation on multiple wavelength division multiplexing (WDM) channels allocated in the optical grid to infer wavelength-wise characteristics of a C+L-band optical line system. In that context, we show that the applied scheme can successfully recreate a visualization of the spatial evolution of the gain tilt imposed by in-line optical amplifiers. Additionally, we propose the utilization of advanced DSP tools based on wavelet-denoising to enhance the performance of an anomaly detection approach. The proposed method not only can improve accuracy of the fault location, by reducing positioning uncertainty, but it also delivers more uniform readings of the anomaly signatures