IEC TR 61292-3:2020 which is a Technical Report, establishes the classification of optical amplifiers (OAs). It also includes a brief description of each amplifier, its general properties, performance, configurations and applications. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:

* document architecture now focuses on EDFA, FRA and SOA,
* the description of PDFA and TDFA has been moved to the annexes,
* the EDWA description has been deleted,
* information on single channel amplification, multi-channel amplification, configuration and control method for EDFA, FRA and SOA has been added,
* information on future amplifiers, arrayed amplifiers and SDM amplifiers has been added.