The Fiber Pigtailed Photodiode Array (FPDA) is a compact, multi-channel power-detecting device. It obviously simplifys module design and assembling process by pre-integrating several single power detectors in one. It provides standard pins with 2.54 mm space to easily mount on PCB.It applys for channel power monitoring in DWDM system, in-line optical network switching protection monitoring (OLP), re-configurable optical add/drop multiplexer (OADM), and gain/attenuation monitoring in network\'s power detection.