Additional Features: 60dB attenuation with 0.001dB resolution, without ranging 1200nm to 1650nm wavelength range 60dB return loss +23dBm maximum input power The Agilent 8156A is ideal for making measurements on fast telecommunication systems. It is employed in R&D and production and is suitable for both single-mode and 50m multi-mode applications. A variety of options for different return loss performance, built-in monitor paths and overall accuracy make the Agilent 8156A easily adaptable to your measurement requirements.