DC up to 500 kHz Variable Gain Fast Power Meter OE-200


  • Adjustable conversion gain from 103 to 1011 V/W
  • Operating range from fW to mW
  • Spectral range from 190 to 1700 nm
  • NEP down to 6 fW/√Hz
  • Bandwidth up to 500 kHz
  • Rise time down to 700 ns
  • Fiber optic or free space input
  • Calibration for all fiber optic models
  • Manual and remote control
Detector TypeSi-PINSi-PINInGaAs-PINInGaAs-PIN
Detector Size [mm] Ø 1.21.1 x 1.1Ø 0,3 (FC: Ø 0,08)Ø 0,3 (FC: Ø 0,08)
Spectral Range [nm]320 – 1060190 – 1000900 – 1700900 – 1700
Calibration Wavelength [nm]85085013101550
NEP (Dependent on Gain Setting) [/√Hz]8 fW – 33 pW17 fW – 60 pW7 fW – 22 pW6 fW – 22 pW
Useful Operating Range typ. 100 fW – 2 mWtyp. 200 fW – 2 mWtyp. 100 fW – 2 mWtyp. 100 fW – 2 mW

The Following Characteristics Are Valid For All Models:

Performance RangeLow NoiseHigh Speed
Conversion Gain [V/W]10310410510610710810910510610710810910101011
Bandwith (-3 dB) [kHz]5005004002005071.15005004002005071.1
Rise Time (10 % - 90 %)700 ns700 ns900 ns1.8 µs7 µs50 µs300 µs700 ns700 ns900 ns1.8 µs7 µs50 µs300 µs
Accuracy Performance±1 % elektrisch, ±5 % elektro-optisch für faseroptische Modelle, ±15 % elektro-optisch für Freistrahl-Modelle, Kalibrierung für alle faseroptischen Modelle
Low Pass FilterSwitchable to 10 Hz
Output±10 V (@ ≥100 kΩ load)
Power Requirements±15 V, +110 mA/−80 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.)

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.

Sensitivity meets versatility

The OE-200 series of variable gain photoreceivers is designed for a great variety of applications requiring the fast and precise measurement of small optical signals. By combining a low noise transimpedance amplifier with a silicon or InGaAs photodiode a broad wavelength range from 190 nm up to 1700 nm is covered. The integrated amplifier offers adjustable gain from 103 to 1011 V/W and thus allows the measurement over a wide dynamic range from ca. 100 fW up to 2 mW optical input power. Its high sensitivity is achieved by a low noise design resulting in a noise equivalent power (NEP) of minimum 6 fW/√Hz. Many additional features like switchable signal filters, an offset adjustment and the capability of manual and opto-isolated remote control by a PC make the OE-200 the most versatile photoreceiver in its class.

Wide bandwidth for fast measurement speed

In addition to its high sensitivity the OE-200 also offers a fast signal response. With its maximum bandwidth of 500 kHz it is ideally suited for time resolved measurements with a signal rise time down to 700 ns. Industrial process control, automated measurement systems and fast opto electronic control loops are just a few of the many applications that can profit from a fast optical front-end realized by the OE-200.

Fast optical power meter with calibration

The high precision and low drift of the OE-200 ensure repeatable and consistent measurements also in the highest gain setting. All models with fiber optic input come with an optical calibration for reliable and accurate results. Thus the OE-200 can be also used as precise and fast power meter with a high bandwidth of up to 500 kHz and a wide dynamic range of up to 100 dB.

Compatible with optical bench (free space) and fiber optics

The free space input (FST) 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.

The relatively large-area detector facilitates optical focusing in free-space applications and ensures a high and stable degree of coupling when using the optionally available fiber optic adapter. 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 OE-200 photo receivers are equipped with UNC 8-32 and M4 threaded holes and can therefore be conveniently and stably integrated into optical systems on standard rod holders. The optionally available adapter plate PRA-PAP opens up further mounting options.


  • All purpose lab photoreceiver
  • Fiber alignment systems
  • Fast power monitoring
  • Test of laser diode to fiber coupling
  • Linearity measurements over 10 decades
  • Calibration of optical communication systems
  • Time-resolved pulse and power measurements
  • Industrial control and alignment systems

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