Agilent Technologies Inc. has added five models to its high-density 77xx family of integrated optical multichannel attenuators and power meters. Designed for testing optical transceiver modules and their subcomponents and for optical network integration tests, they provide high-speed attenuation and power setting, and fast power measurement. They are supplied with USB, LAN and GPIB interfaces. The N7751A and N7752A are hybrids that combine one or two variable single-mode fiber optical attenuators and two power meter channels in one unit. The N7761A, N7762A and N7764A have granularities of one, two and four attenuator channels in one unit. Settling time is 20 ms, and transition speed is selectable from 0.1 to 1000 dB/s.