Pure Photonics provides a suite of inline photo detection (and control) solutions. 

• The power monitors (formerly Eigenlight) are provided in module format (M500) and in component format (photodiode only, SR100). Both solutions provide excellent dark current (down to -50dBm), high power capability (up to 25dBm) and directiona detection (light in one direction is detected, the other direction is ignored by up to 40dB)
• Inline attenuation is provide by an air gap assembly (VG01) with up to 50dB extinction, manually controlled. Or by a MEMS solution, controlled by voltage, (FVOA8000) with 30dB attenuation. 
• The inline array solution combines the excellent dynamic range (>60dB) of the power monitor with an integration solution to monitor multiple channels. The power level can be read out through the digital interface or through an analog interface (SMA, 1mV per dBm). The system provides superior precision and consistency over the power range. The product can also be configured with a VOA to either attenuator a given amount or to track the output power to a certain target.