Compact erbium-doped fiber amplifiers produced by Agere Systems, Alcatel Optronics and Nortel Networks will conform to specified packaging dimensions, pin functionality, and optical and electrical characteristics as a result of a multisource agreement among the companies. The standardization will give optical systems manufacturers multiple sources for components that could be incorporated into systems without costly redesign.The amplifiers are suitable for single-channel or narrowband applications from metropolitan to the ultralong-haul networks.