System Interaction; Table 8: Maximum Optical Signal Levels - Tektronix 80C00 Series User Manual

Attenuating Optical
Signals

System Interaction

80C00 Series Optical Sampling Modules User Manual
To keep the optical input power to an appropriate level, it may be necessary to
attenuate the optical signal.
CAUTION.
To avoid damaging the optical input of the module, attenuate the input
optical signal to the Absolute Maximum Nondestructive Optical Input (peak)
specifications. To maintain the levels within performance range and to avoid
clipping, use the following table to set the maximum optical input signal levels:

Table 8: Maximum optical signal levels

Module
80C02
80C07B
80C08C
80C10B
80C11
80C12
80C25GBE
NOTE.
The 80C07B module can have a somewhat deteriorated response for
signals greater than 200 μW
and 850 nm). The 80C08C and 80C12 modules also can have a somewhat
deteriorated response for signals larger than 500 μW
and 800 mW (850 nm).
p-p
NOTE.
Optical sampling modules may have dynamic ranges exceeded without
obvious visual indication onscreen because the overloaded signal output of the
photodetector may still be within the dynamic range of the internal electrical
sampler.
Your optical module is a part of a larger instrument system. Most optical module
functions are controlled automatically by the main instrument. These include such
things as vertical scaling and horizontal sampling rate. You do not directly control
these parameters; they are controlled for you as you perform tasks on the main
instrument. The parameters that you control from the optical module front panel
are explained in the Front Panel Controls section.
An additional optical module function that you control from the main instrument
is external channel attenuation. External Attenuation lets you enter a number
representing any external attenuation you have added to a channel.
Average
5 mW
5 mW
1 mW
20 mW
5 mW
1 mW
20 mW
(1310 nm and 1550 nm) and 400 mW
p-p
Operating Basics
Peak
10 mW
10 mW
10 mW
60 mW
10 mW
10 mW
60 mW
(780 nm
p-p
(1310 nm and 1550 nm)
p-p
15