Summary: 

The ML4015D is a fully featured, cost effective single channel optical sampling oscilloscope that is also available as an electrical oscilloscope. It can be configured to have an analog optical bandwidth of 25 or 40 GHz. The supported range of wavelengths is either 1260 to 1650 nm Single-Mode or 750 to 860 nm Multi-Mode. The electrical version is available either with a 32 GHz sampling head or with 50 GHz.