214 8163A/B, 8164A/B, 8166A/B User’s Guide
8 Setting Attenuation and/or Power Levels
Keysight 8157xA Variable Optical Attenuator modules
The Keysight 8157xA Variable Optical Attenuator family includes three
attenuator modules and two attenuator modules with power control.
Table 14 The Keysight 8157xA Variable Optical Attenuator family
The 81570A, 81571A, 81573A and 81578A single-slot modules offer a
small footprint, high resolution and low insertion loss. They also offer high
power handling and a filter technology that is wavelength flat.
The 81576A and 81577A dual-slot modules incorporate a powermeter so
that you can set the output power level of the attenuator directly. In
addition, these modules feature power control functionality, high power
handling and a filter technology that is wavelength flat.
Figure 132 on page -215 shows how a signal from a photo-diode after a
monitor coupler is used as an active feedback loop
Module Description
81570A high power, single slot, straight connectors
81571A high power, single slot, angled connectors
81573A high power, single slot, SMF pigtail
81576A high power, dual slot, power control, straight connectors
81577A high power, dual slot, power control, angled connectors
81578A high power, single slot, multimode