The optical power meter OPM400 is designed for precise, high speed measurement of optical power in the nW to mW range. The output is a voltage linearly proportional to the input power.
The gain of the OPM400 is controlled via a hard-wire interface on the back panel.
The OPM400 measures optical power via a photodiode. Photodiodes are useful for power measurement in the visible and near infra-red due to their inherent sensitivity and speed of measurement.
Photodiodes produce a current which is proportional to the incident light power over a wide dynamic range. The disadvantage when compared to calorimetric devices is the wavelength dependance. However, for use with monochromatic sources, the detector can be calibrated and the measured current corrected accordingly.
The current from the photodiode is converted to a voltage through a precise transimpedance amplifier. This amplifier is very linear over the full measurement range of the device.
The OPM400 amplifier employs high quality photodiodes and precision transimpedance input stages to provide for low offset and high linearity throughout the full dynamic range.
This optical power monitor is particularly useful for the measurement of fibre coupled sources. The output is a voltage linearly proportional to input power. The fast response time at high signal-noise ratio makes this OPM series particularly useful in systems control feedback loops.
The high sensitivity and large dynamic range allow measurement of a wide range of optical sources such as lasers and LEDs alike.
The OPM400 series is insensitive to electromagnetic interference by design, an important factor when working in “dirty” industrial environments.
These units are provided in a modular 19“ rack mount system.
| Parameter | Conditions | Si, InGaAs | Ge | Units | ||||
|---|---|---|---|---|---|---|---|---|
| Input | ||||||||
| Power ranges (full scale) | Maximum range Minimum range | 4.5 (typ) 45 (typ) | 45 (typ) 450 (typ) | mW nW | ||||
| Noise equivalent power (NEPRMS ) | Range: 4.5mW Range: 45nW | 2.5 (max) 0.5 (max) | 25 (typ) 5 (typ) | µW nW | ||||
| Connectors | FC, SMA or ST | FC, SMA or ST | ||||||
| Output | ||||||||
| Function | Linear analogue : Vout = scale x I in | |||||||
| Output range (full scale) | 3.7 (min) | 3.7 (min) | V | |||||
| Output scale with 16 gain range option | Range: Si, InGaAs 4.5mW-45nW Ge 45mW-450nW | 1 (typ) 0.1 (typ) | 0.1 (typ) 0.01 (typ) | V/mW V/nW | ||||
| Output scale with 4 gain range option | Range: Si, InGaAs 4.5mW-450nW Ge 45mW-4.5µW | 1 (typ) 1 (typ) | 0.1 (typ) 0.1 (typ) | V/mW V/µW | ||||
| Connectors | BNC and DB25 | BNC and DB25 | ||||||
| Setting time (1%) | Source capacitance < 100pF | 2 (max) | 2 (typ) | |||||
| Rise / Fall time (10% – 90%) | Source capacitance < 100pF | 1 (max) | 1 (typ) | µs | ||||
| Accuracy | ± 1 (min) | ± 1 (min) | % | |||||
| Output impedance | 50 (max) | 50 (max) | Ω | |||||
| Logic | ||||||||
| Current required for switching | HI=5V LO=0V | – 100 (min) 5 (typ) 100 (max) | – 100 (min) 5 (typ) 100 (max) | nA | ||||
| Switching time | 2 (max) | 2 (max) | µs | |||||
| Power supply | ||||||||
| Type | Wall plug (supplied) | Wall plug (supplied) | ||||||
| Dimensions | ||||||||
| 1 channel | 103 x 106 x 116 (B x H x L) | mm | ||||||
| 4 channel | 103 x 106 x 116 (B x H x L) | mm | ||||||
| 19″ rack modules | 3U | |||||||
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