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Optical input
Heat Sink for 81628B optical Head
Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User's Guide
Disabling Autoranging
Select the best range for the application using the mainframes user
interface. Select <Menu>, <Range Mode>, <Manual> and then choose
from the list of ranges.
Applications
Possible applications for the analog output are:
•
to close the feedback loop controlling the current supplied to a laser
•
to aid positioning the system for fiber alignment tasks
•
to monitor optical power on an oscilloscope
The analog signal reacts instantaneously to the input signal, whereas the
power shown on the display is subject to averaging.
The optical input to the optical head requires a connector adapter to
match the connector type (or bare fiber) to the optical head interface.
The optical head interface can be either threaded or a D-type magnetic
interface depending on the model of optical head (81628B is only available
with a threaded interface). See
connector adapters available.
When a connector adapter is fitted it should be locked in place by
tightening the locking screws located either side of the main optical head
housing.
The 81628B optical head has a heat sink that allows an extended
operating power range. This heat sink must be mounted on the integrating
sphere for operation from 34 dBm to 38 dBm.
Getting Started with Optical Heads
Accessories
on page 25 for details of the
1
19
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