Electro-Optics Technology, Inc.
Electro-Optics Technology, Inc. | 3340 Parkland Ct. Traverse City, MI 49686 USA
eotech.com | sales@eotech.com | 231.935.4044
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customer to modify the device. All returns should reference the RMA number on the
outside of the shipping container and should be sent to:
Electro-Optics Technology, Inc.
Attn: Sales/Customer Service
3340 Parkland Ct.
Traverse City, MI 46986 USA
EOT reserves the right to inspect photodetectors returned under warranty to assess if the
problem was caused by a manufacturer defect. If EOT determines the problem is not due
to a manufacturer defect, repairs will be done at the customer’s expense. EOT will
always provide a written quote for repair prior to performing repairs at the customer’s
expense.
VI. Glossary of Terms
Amplifier: Provides a transimpedance gain throughout the photodiode’s bandwidth. The
photodiode current is converted to an output voltage.
Bandwidth: Unlike non-amplified photodetector bandwidth, which is defined as the
range of frequencies from 0 Hz (DC) to the frequency at which the amplitude decreases
by 3 dB, the amplified photodetectors have a low frequency cutoff of -3 dB, which is
greater than 0 Hz due to the DC Block Capacitor. Bandwidth and rise time can be
approximately related by the equation:
Bandwidth ≈ 0.35/rise time for a Gaussian pulse input.
Bias Voltage: The photodiode’s junction capacitance can be modified by applying a
reverse voltage. The bias voltage reduces the junction capacitance, which causes the
photodiode to have a faster response.
BNC Connector: Used to connect the customer’s coaxial cable.
Conversion Gain: The relative level of the optical input power that is amplified and
converted into a voltage output.
DC Block Capacitor: Prevents the DC voltage that is supplied through the amplifier
output from exiting the detector which would cause a large DC offset voltage. Therefore,
the amplified detector is an AC coupled device and will have a low cut-off frequency as
well as a high cut-off frequency.
Decoupling Capacitor: Maintains bias voltage when fast pulses cause the battery
voltage to reduce (this would slow the response time of the photodiode); the capacitor
allows the battery to recover to its initial voltage. It also acts as a low-pass filter for
external power supplies.
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