Optical amplifiers are used in amplified nodes such as hub nodes, amplified OADM nodes, terminal nodes, and line amplifier nodes. The optical amplifier card architecture includes an optical plug-in module with a controller that manages optical power, laser current, and temperature control loops. The amplifier also manages communication with the TCC2, and operations, administration, maintenance, and provisioning (OAM&P) functions such as provisioning, controls, and alarms.PRODUCT FEATURES:Fixed gain mode (with programmable tilt);True variable gain;Fast transient suppression;Nondistorting low-frequency transfer function;Settable maximum output power;Fixed output power mode (mode used during provisioning);Constant drive current mode (test mode);MAL for fiber based DCU;ASE compensation in fixed gain mode;Full monitoring and alarm handling with settable thresholds;Optical safety features, including signal loss detection and alarming, fast power down control, and reduced maximum output power in safe power mode;OSRI is a feature capable of shutting down the optical output power or reducing the power to a safe level (automatic power reduction);ALS is a safety mechanism used in the event of a fiber cut.