OPM200

The OPM200 amplifier employs high quality photodiodes and precision transimpedance input stages to provide for low offset and high linearity throughout the full dynamic range. FIELDS OF APPLICATION These optical power monitors are particularly useful for the measurement of rapidly changing optical ...Read more

The optical power monitor OPM200 is designed
for precise, high speed measurement of optical
power in the µW to mW range.
The output is a voltage linearly proportional to
the input power. The gain of the OPM200 is fixed.
 

CHARACTERISTICS

Interfaces: DB9 (analogue outputs)
Rise time: 35ns (10MHz)
Noise equivalent power: 1 µW (RMS)
Gain control: none



The OPM200 amplifier employs high quality photodiodes and precision transimpedance input stages to provide for low offset and high linearity throughout the full dynamic range.


FIELDS OF APPLICATION

These optical power monitors are particularly useful for the measurement of rapidly changing optical signals. These units have a particularly high bandwidth of 10MHz allowing monitoring of high frequency noise components of many light sources. The output is a voltage linearly proportional to input power. The fast response time at high signal-noise-ratio makes the OPM200 series particularly useful in systems control feedback loops.

The OPM200 series is insensitive to electromagnetic interference by design, an important factor when working in "dirty" industrial environments. These units are provided in OEM-style enclosures. The case wings provide for mounting on standard 25mm and 1" optical table tops and for OEM applications.


• Detector: UV-Si, Ge, InGaAs, x-InGaAs, V-InGaAs

• Input receptacle: FC-receptacle, SMA-receptacle, free beam

• Case: gull wing, lab style

• Number of channels: 1, 2, 3, 4


• Attenuators: FC-PC, FC-APC


What are xInGaAs and V-InGaAs detectors?

These are two variations on the standard InGaAs (Indium-Gallium-Arsenide) photodiode.
The xInGaAs type has extended IR sensitivity out to 2100nm useful wavelength range. The short wavelength cut-off is the same as standard InGaAs.
The V-InGaAs type has extended visible range sensitivity down to 400nm useful wavelength range. The long wavelength cut-off is the same as standard InGaAs.

 

What is a "free beam" input receptacle?

By "free beam", we mean that the photodiode is openly mounted on the front plate of the unit. This is to allow measurement of free beams (not fibre coupled). This configuration may be inconvenient since the amplifier must be mounted directly in the beam path. If you wish to have a remote detector head then use the TZA200 (transimpedance amplifier) instead to measure the current from the remote photodiode.

 

What does an output impedance of 50Ω mean?

The output impedance of an amplifier is an important factor when dealing with fast signals. The speed of the OPM200 is fast enough for this parameter to be relevant. Essentially, the output of the amplifier is a 50Ω resistance in series with the output. This allows you to terminate the signal line with a 50Ω resistance to prevent back reflections. The result is a clean signal transient without overshoot. The disadvantage is that the signal voltage is halved by doing this. The amplifier may be used without the 50Ω termination resistance, but then there will be overshoot when amplifying fast transients.

Spezifikationen OPM200