General Information; Ordering Codes And Accessories - THORLABS PDB47 C Series Operation Manual

1 General Information

Thorlabs PDB47xC 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 PDB47xC
housing. This adapter supports #8-32 as well as M4 post mounts.
The PDB47xC 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 Ordering Codes and Accessories

PDB470C 400 MHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector
with fiber length matched pigtailed InGaAs photo diodes, fiber SMF28
PDB471C 400 MHz, fixed gain, ultra-low distortion Balanced Amplified Photodetector
with fiber length matched pigtailed InGaAs photo diodes, fiber HI1060
© 2021 Thorlabs
section gives an overview of how to set up the PDB47xC Balanced
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1 General Information
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