Agilent 81623A Ge Optical Head
5mm Diameter
The analog output is the BNC connector on the back of the
optical head. It outputs a voltage directly proportional to the
strength of the optical signal at the optical input in the current
range. The analog signal is always in the range between 0 and
2V, 2V corresponding to a full power input signal in the current
range, 0V corresponding to no input signal.
During autoranging, the level to which 2V corresponds changes.
You should disable autoranging when using the analog output.
Disabling Autoranging
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.