Can I get a dual channel optical power sensor module with an analogue output?

There is no room on the dual channel power sensor for an analogue output. Thus no 81635B is available. The 81635A is still the current dual channel power sensor. If you want to save space and need analogue outputs, please consider using the optical heads with the 81619A dual channel interface module. The analogue output is present on the optical heads and not on the interface module. However, keep in mind that the optical heads could be more expensive so you might be better off using another mainframe.