125-MHz Photoreceivers
Operation • 7
providing a minimum of 0.25 A of current on ±15
V. The convention of the three banana plugs is:
2.
Turn on the optical beam.
3.
For free-space beam input, align the module so
that the beam is incident on the detector surface.
For fiber-optic input, connect the fiber-optic cable
from your optical source to the FC input
connector on the front of the module. The
detector is designed to receive an FC/PC
connectorized fiber.
To operate the receiver in the linear region, keep the input power
levels well below the cw saturation power specification on
page 12. (The input power is wavelength dependent and is
inversely proportional to the responsivity.)
To set up the output connection:
1.
If your RF measurement instrument has a male
connector, connect it directly to the SMA female
output connector (labeled “AC” on AC-coupled
units) on the back of the module.
2.
If your instrument has a female connector, con-
nect with the appropriate cable.
3.
On AC-coupled units, monitor the DC bias on
the output labeled “DC” with the provided SMB-
to-BNC cable.
Banana Plug
Voltage
Red
+15 V
Green
COM/GND
Black
-15 V
Note:
Note:
18X1 HS rcvr rev G.fm Page 7 Thursday, September 20, 2001 2:08 PM
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