200 MHz Variable Gain Photoreceiver OE-300


  • Adjustable transimpedance gain from 102 to 108 V/A
  • Wide bandwidth up to 200 MHz
  • Various Si and InGaAs models cover the 320 to 1700 nm wavelength range
  • High dynamic input range up to 10 mW optical power
  • Large optical detector size up to 3 mm dia.
  • Very low noise, NEP down to 47 fW/√Hz
  • Switchable low pass filters for minimizing wideband noise
  • Fiber optic and free space input
  • 1.035″-40 threaded free space input compatible with many optical standard accessories
  • Full manual and remote control capability
Detector TypeSi-PINSi-PINInGaAs-PINInGaAs-PIN
Detector Size [mm] 1.0 x 1.0Ø 3.0Ø 0.08Ø 0.3
Spectral Range [nm]400 – 1000320 – 1000900 – 1700800 – 1700
NEP (Dependent on Gain Setting) [/√Hz]76 fW – 322 pW81 fW – 325 pW47 fW – 180 pW52 fW – 192 pW

 The following characteristics are valid for all models:

Performance RangeLow NoiseHigh Speed
Gain Setting [V/A] (Transimpedance)102103104105106107103104105106107108
Bandwidth (−3 dB) [MHz]200 (100)180 (60)1143.51.80.22175 (100)180 (60)1143.51.80.22
Accuracy Performance±1 % (transimpedance)
Low Pass Filterswitchable to 1 MHz and 10 MHz
Output±1 V (@ 50 Ω load), for linear amplification
Power Requirements±15 V, +150 mA/−100 mA typ., ±200 mA recommended
Control Interface5 opto-isolated digital inputs, TTL/CMOS compatible, analog offset control voltage input
Case170 x 60 x 45 mm (L x W x H), Weight 320 g (0.74 lb.)

1) model OE-300-SI-30

Offset adjustable by trimpot or external control voltage. LED overload indication. 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. For further information please view the datasheet or contact FEMTO.

State-of-the-art photodetection in MHz range

The OE-300 photoreceiver consists of a premium quality photodiode followed by a high-end, variable gain transimpedance amplifier. The low noise performance (NEP) is outstanding and sets a benchmark for wideband photoreceivers particularly in the high and mid-range gain settings. The relatively large sized detectors make optical alignment easy and also ensure a very high coupling efficiency when using the Si models together with the optionally available fiber optic adapters PRA-FC/SMA.

The switchable gain from 102 to 108 V/A (decade increments) allows precise and reliable measurements within a very wide dynamic range from nanowatts up to 10 milliwatts optical power.

Many additional features like switchable low-pass filters, offset adjustment, switchable AC/DC coupling and the capability of manual and opto-isolated remote control by a PC make the OE-300 the most versatile wideband photoreceiver in its class.

Compatible with optical bench (free space), breadboard, cage systems and fiber optics

The Si-models are factory equipped with an optical free space input (FST) which is designed as a 1.035″-40 threaded flange with a screw-on coupler ring. It opens up a broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.

The free-space input can be converted into fiber connections (FC, FSMA) easily by simply screwing on the fiber adapter of the PRA series.

For the InGaAs models there is the choice between a fixed fiber input (FC) model allowing highly accurate fiber optic measurements and a model with free space input.

For models with detector areas smaller than Ø 0.4 mm, the use of fiber adapters is only recommended to a limited extent, since coupling losses and instabilities can occur. If the focus is on high-precision fiber optic measurements, using FC-models with fixed optical fiber input will usually give the best results.

All the OE-300 models can be easily mounted to standard M4 and 8-32 UNC threaded optical post holders via the optionally available post holder adapter type PRA-PAP.

Device holder is not included


  • All purpose low-noise photoreceiver (O/E converter) for the MHz range
  • Time resolved optical pulse and power measurements
  • Laser intensity noise measurements (RIN)
  • Optical front-end for oscilloscopes, spectrum analyzers, A/D converters and RF lock-in amplifiers

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Power Supply

USB Control Interface LUCI-10


Post Adapter Plate