OPM400
10Pages

Optoelectronics & Engineering Services Wide Dynamic Range Optical Power Monitor HIGHLIGHTS • Wide dynamic range • Production automation (eg: connectorization, pigtailing) • Fine gain spacing 16 gain ranges in 1-2-5 spacing • Component testing, burn-in, lifetime • Small signal rise time (10-90%) • Maximum optical power • Noise equivalent power (NEPRMS) MEASUREMENT PRINCIPLE The OPM400 series of optical power monitors employs photodiodes to measure optical power. Precision single ended transimpedance input stages to provide for low offset and high linearity throughout the full dynamic range. These optical power monitors are particularly useful for the linear measurement and monitoring of optical power. The fast response time at high signal-noise-ratio makes the OPM400 series particularly useful in systems control feedback loops, such as in fibre alignment systems. The high sensitivity and wide dynamic range allow measurement of fibre coupled lasers and LEDs alike. Several options of photodiode material and optical input, make these units useful Artifex Engineering Dortmunderstr. 16-18 26723 Emden, Germany • Quality control in a wide range of applications including non-telecom metrology. These amplifiers have a particularly high sensitivity and large dynamic range. There are 16 gain ranges covering 5 decades of gain in a 1-2-5 pattern. The gain-to-gain accuracy of <1% allows confident measurements of power curves over the full range of sensitivity of the device: 6½ decades of measurement range. Thus even very demanding measurements such as the accurate and high speed, real-time determination of polarization extinction ratio becomes a simple task. The OPM400 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. mail: info@afx-eng.com http://www.afx-eng.com

ABSOLUTE MAXIMUM RATINGS ORDERING INFORMATION Full order code: OPM400 c g d r n Options Description Number of gain ranges 4 For example, a 2 channel, OEM style unit with fine gain spacing and a single mode fibre input at 1550nm would be ordered as: For customized systems (mixed receptacles or units with mixed electrical and optical inputs, for example), please contact us. Gull wing Rack mount free beam Rack mount

PARAMETER INPUT Power ranges (full scale) Maximum range Minimum range Noise equivalent power (NEPRMS) OUTPUT Output range (full scale) Linear analogue Vout = scale x Iin Output scale with 16 range option Output scale with 4 range option Rise / Fall time (10% - 90%) Accuracy Output impedance LOGIC Current required for switching Dead time during change of range POWER SUPPLY Type DIMENSIONS Wall plug (supplied) 1 channel * Identical values as for Si, InGaAs version 1 Adapters for other connector systems available. Limited by settling time. The logical switch is complete within 20ns. 130 mm...

THE FRONT AND BACK PANELS The front panel contains the input receptacles and output BNC connectors. The upper row of receptacles is for the optical inputs. The channel count begins at the left. The lower row of BNC connectors is for the amplifier outputs. The output is 0-4.5V, linearly proportional to the optical input. The channel count begins at the left. The back panel contains the interface connectors for gain (DB25, male) and for the channel outputs (DB25, female). These outputs are the same as the BNC outputs on the front panel, buffered from another. Thus, the front panel outputs are...

APPLICATIONS EXAMPLES Typical applications may be found in measuring currents from photodiodes, photomultipliers, ionisation detectors, etc. with applications in component manufacture and testing, OEM, spectroscopy, as preamplifiers for lock-ins, A/D-converters, etc. LINEAR OR LOGARITHMIC? The question often arises as to which signal processing technique is better: an output linearly or logarithmically proportional to the input current. The use of logarithmic amplifiers results from the large dynamic range of relevant currents in many applications. For example, the TZA500 series can measure...

INSTRUCTIONS FOR MEASUREMENT The OPM400 optical power monitor comprises one to sixteen independent measurement channels, depending on the model chosen. Each channel consists of a receptacled optical input and a BNC-output. These two user interfaces are arranged in logical groups (see „The Front and Back Panels“). To make a measurement, proceed as follows: 1. Turn the unit on. For the most accurate measurement, please allow for a 15 minute warm up before using. 2. Connect an optical source to the desired channel via the corresponding receptacle. Ensure that the lug of the fibre connector is...

Gain Interface This unit is designed for „Remote“ mode gain switching. The range is set via the logic pins of the “Gain” interface connectors on the back plane. The logic is switched using +5 V / 0 V (= digital ground) logic, which may be TTL4. The current drawn is less than 1 µA. In the following table, “1” corresponds to 5V logic input and “0” corresponds to 0V logic input. r = 16 option Please note that this interface does NOT correspond to the RS-232 norm. The interface is designed for direct driving (no protocol) with I/O cards, for example.

Output Interface The pinning of the output interface (DB25-female) is as follows: Pin No. Function AGND (analogue ground) AGND (analogue ground) DGND (digital ground) DGND (digital ground) The above table shows the pinning of a 4 channel device. Devices with less channels use only the corresponding gain and output pins.

DAMAGE The unit may be damaged by exceeding the maximum average input power. Please read „Absolute Maximum Ratings“ for these maximum values before working with the instrument. Use only the power supply and power supply cable provided with the unit. TROUBLESHOOTING In the event that a measurement is not successful, the following possibilities should be analysed: Symptom Possible Errors • Ensure the power cord is connected at both ends and switch the system on. Output at full scale, independant of input current • Switch to more sensitive range or increase input power • Input or output...