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High Speed Photoreceivers - up to 400 MHz


High Sensitivity Photoreceivers at High Bandwidth

The series HCA-S-400M Photoreceivers combine fast photodiodes with the proven and outstanding FEMTO HCA Current Amplifier technology. The HCA-S-400M is available with either a fast Si or InGaAs photodiode covering a spectral range from 320 to 1000 nm and 900 to 1700 nm, respectively.
The amplifier transimpedance is 5 x 103 V/A resulting in a maximum conversion gain of 5 x 103 V/W at 1550 nm for the InGaAs model. The sophisticated DC coupled multi-stage amplifier design allows measurements from DC to a maximum bandwidth of 400 MHz corresponding to a minimum rise-time of 1 ns. Due to the low-noise design signals with an optical power in the micro-Watt range can be detected without the need for further averaging. Different models with free space or fiber optic input are available.
Best Possible Solution With Customized Photoreceivers
Every application is different with its individual requirements for bandwidth, gain and responsivity. Therefore FEMTO offers customized photoreceivers with optimized specifications for a great variety of applications in addition to the standard product portfolio. After a detailed analysis we offer individual solutions at very reasonable prices and already in single quantities. Please contact us for details.
  • Spectroscopy
  • Fast Pulse and Transient Measurements
  • Optical Triggering
  • Test of Digital Fiber-Optic Systems
  • Optical Front-End for Oscilloscopes and A/D Converters


  Click Part # to view pdf datasheet
Model HCA-S-400M-SI HCA-S-400M-IN
Spectral Range 320 ... 1000 nm 900 ... 1700 nm
Bandwidth (-3 dB) DC ... 400 MHz DC ... 400 MHz
Rise Time (10% - 90%) 1 ns 1 ns
Transimpedance Gain 5 x 103 V/A 5 x 103 V/A
Max. Conversion Gain 2.7 x 103 V/W 4.8 x 103 V/W
Min NEP 40 pW/√Hz (@ 800 nm) 24 pW/√Hz (@ 1550 nm)
Saturation Power 400 μW (@ 800 nm) 200 μW (@ 1550 nm)
Detector Si PIN, Ø 0.8 mm InGaAs PIN,  Ø 0.3 mm
Input Free Space, 25 mm Ø Flange
Output 50 Ω, BNC
Output Voltage Range + 1.5 V @ 50 Ω Load
Power Requirements + 15 V, + 55 mA Typ.

Threaded M4 and 8-32 holes for mounting on standard posts. 25 mm Ø flange compatible with microbench systems. Offset adjustable by trimpot. Fiber optic input optional. Output short-circuit protected. Power supply via 3-pin LEMO socket. A mating connector is provided with the device. Optional power supply PS-15 available. The photoreceivers with free space input come with threaded M4 and 8-32 mounting holes for integration in optical bench systems. For further information please view the datasheet.

FEMTO Product Catalog (pdf)

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