The DG-15ir is a 20 GHz detector designed for 950–1650 nm measurement applications where an instrument-style product is desirable. It provides a peak responsivity of 0.6 A/W at 1310 nm and a flat frequency response. This instrument provides a high performance PIN detector in a hand-held, rugged, black-anodized case. The case contains the detector module, power conditioning circuitry, photocurrent monitor, fiber optic input port, and Anritsu-K output connector in addition to a power switch and indicator light. Designed with R&D applications in mind, it can be attached to virtually any diagnostic instrument to provide optical capability.