General Information; Safety; Ordering Codes And Accessories - THORLABS PDB48*C-AC series Operation Manual

1 General Information

Thorlabs PDB48xC-AC Balanced Amplified Photodetectors consist of two well-matched, fiber
coupled photodiodes with length matched fibers and an ultra-low noise, ultra-low distortion
high-speed transimpedance amplifier that generates an output voltage (RF OUTPUT) propor-
tional to the difference between the photo current in the two photodiodes, i.e. the two optical in-
put signals. Additionally, the unit has two fast monitor outputs (MONITOR+ and MONITOR-) to
measure the individual optical input power level as well as low frequency (up to 3 MHz) modu-
lated signals on each detector separately.
An adapter for post mounting can be attached to the bottom or side surface of the PDB48xC-
AC housing. This adapter supports #8-32 as well as M4 post mounts.
The PDB48xC-AC is supplied with an external linear power supply.
The "Getting Started"
Amplified Photodetectors. Subsequent sections contain detailed information about principle of
operation, operating suggestions and technical specifications.

1.1 Safety

Attention
The safety of any system incorporating the equipment is the responsibility of the assem-
bler of the system.
All statements regarding safety of operation and technical data in this instruction manual
will only apply when the unit is operated correctly as it was designed for.
Do not remove covers! Do not open the cabinet. There are no parts serviceable by the
operator inside!
This precision device is only serviceable if properly packed into the complete original
packaging including the plastic foam sleeves. If necessary, ask for replacement pack-
aging.
Refer servicing to qualified personnel!
Only with written consent from Thorlabs may changes to single components be made or
components not supplied by Thorlabs be used.

1.2 Ordering Codes and Accessories

PDB480C-AC 1.6 GHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector with
fiber length matched pigtailed InGaAs photo diodes, fiber SMF28
PDB481C-AC 1.0 GHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector with
fiber length matched pigtailed InGaAs photo diodes, fiber HI1060
© 2019 Thorlabs
section gives an overview of how to set up the PDB48xC-AC Balanced
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1 General Information
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