In this paper, we approach the optimization of IM-DD systems leveraging APD-based receivers and Feed-Forward Equalization (FFE) at the receiver side (RX). We review the role of APD-based receivers in recent evolutions of IEEE and ITU-T standards for high-speed Passive Optical Networks (PON) and in particular in 50G-PON as discussed in the recently approved Recommendation ITU-T G.9804.3. We analyze different optimization methods for PAM-2 (NRZ) and PAM-4 modulation formats, based on grid search methods and analytical closed-form solutions for decision thresholds and PAM-4 internal levels. We develop our study on a simulated optical IM-DD system, transmitting at a Baud Rate R s =50 GBaud (i.e., 50 Gbps for NRZ, 100 Gbps for PAM-4). We assess power budget gain in terms of Optical Path Loss (OPL) with respect to nominal thresholds and levels, determining that optimizations are effective (i.e., approximately 1 dB OPL gain) when the system has moderate bandwidth limitations (B3dB>0.5⋅Rs). Our study can be of interest in the future for a better definition of the TDEC parameter for APD-based receivers.

Optimization of 50G-PON APD-based receivers / Minelli, Leonardo; Abdellatif, Ahmed; Gaudino, Roberto. - ELETTRONICO. - (2022), pp. 1-4. ((Intervento presentato al convegno 2022 Italian Conference on Optics and Photonics (ICOP) tenutosi a Trento, Italy nel 15-17 June 2022 [10.1109/ICOP56156.2022.9911721].

Optimization of 50G-PON APD-based receivers

Minelli, Leonardo;Abdellatif, Ahmed;Gaudino, Roberto
2022

Abstract

In this paper, we approach the optimization of IM-DD systems leveraging APD-based receivers and Feed-Forward Equalization (FFE) at the receiver side (RX). We review the role of APD-based receivers in recent evolutions of IEEE and ITU-T standards for high-speed Passive Optical Networks (PON) and in particular in 50G-PON as discussed in the recently approved Recommendation ITU-T G.9804.3. We analyze different optimization methods for PAM-2 (NRZ) and PAM-4 modulation formats, based on grid search methods and analytical closed-form solutions for decision thresholds and PAM-4 internal levels. We develop our study on a simulated optical IM-DD system, transmitting at a Baud Rate R s =50 GBaud (i.e., 50 Gbps for NRZ, 100 Gbps for PAM-4). We assess power budget gain in terms of Optical Path Loss (OPL) with respect to nominal thresholds and levels, determining that optimizations are effective (i.e., approximately 1 dB OPL gain) when the system has moderate bandwidth limitations (B3dB>0.5⋅Rs). Our study can be of interest in the future for a better definition of the TDEC parameter for APD-based receivers.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2972472