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>12.5 GHz Photodetectors Data Sheet

>12.5 GHz Photodetectors

EOT’s >12.5 GHz Photodetectors contain PIN photodiodes that utilize the photovoltaic effect to convert optical power into an electrical current.  When terminated into 50 Ω into an oscilloscope, the pulsewidth of a laser can be measured.  When terminated into 50 Ω into a spectrum analyzer, the frequency response of a laser can be measured.  EOT’s >12.5 GHz Photodetectors come with their own internal bias supply consisting of long life-lithium cells.  Plugging a coaxial cable into the photodetector’s SMA output connector and terminating into 50 Ω at the oscilloscope or spectrum analyzer is all that is required for operation.

Applications:

· Monitoring the output of Q-switched lasers

· Monitoring the output of mode-locked lasers

· Monitoring the output of externally modulated CW lasers

· Time domain and frequency response measurements

Features:

· >12.5 GHz GaAs and InGaAs Photodetectors can be ordered with optional wall plug-in power supply

Specificationsa,b:

Part No. (Model)
120-10058-0001
(ET-3500)
120-10068-0001
(ET-3500F)
120-10071-0001
(ET-4000)
120-10081-0001
(ET-4000F)
Detector Material
InGaAs
InGaAs
GaAs
GaAs
Rise Time
25 ps
25 ps
30 ps
30 ps
Responsivityc
0.90 A/W at 1300 nm
0.65 A/W at 1300 nm
0.53 A/W at 830 nm
0.38 A/W at 830 nm
Power Supply
6 VDC
6 VDC
3 VDC
3 VDC
Bandwidth
>15GHz
>15GHz
>12.5GHz
>12.5GHz
Active Area Diameter 
32 µm
32 µm
60 µm
60 µm
Dark Current 
3 nA
3 nA
0.5 nA
0.5 nA
Acceptance Angle (1/2 angle)
15
N/A
15
N/A
Noise Equivalent Powerd
20 pW/√Hz at 1300 nm
28 pW/√Hz at 1300 nm
35 pW/√Hz at 830 nm
45 pW/√Hz at 830 nm
Maximum Linear CW Power
10 mW
10 mW
10 mW
10 mW
Mounting (Tapped Holes)
8-32 or M4
8-32 or M4
8-32 or M4
8-32 or M4
Output Connector
SMA
SMA
SMA
SMA
Fiber Optic Connectione
N/A
FC/UPC, SMF28e
N/A
FC/UPC, SMF28e

a Product specifications are subject to change.
b All specifications apply for a 50 Ω termination unless otherwise noted.
Photodetectors have an internal 50 Ω termination. Responsivity data applicable to diode only. Detector output should be determined based on 1/2 the responsivity of that shown on graph.
Noise Equivalent Power (NEP) is determined via open circuit output.
Multi-mode fiber available. May limit bandwidth.
Note: All products are RoHS compliant.