An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Optical amplifiers are. 📦 For purchasing, use the RP Photonics Buyer's Guide for optical amplifiers. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. They play a vital role in modern optical communication systems, enabling the transmission of high-speed data over long-haul networks. E ( t ) + n ( t ) Booster (power) amplifiers: Boost power into transmission fiber, low NF, high Psat.