OPM500
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Flexible Optical Power Monitor Maximum optical power Production automation (e.g.: connectorization, pigtailing) Noise equivalent power (NEPRMS) Component testing, burn-in, lifetime Rise / Fall time (10% - 90%) linear analogue USB Gain and bandwidth control 6 gain ranges 4 bandwidths MEASUREMENT PRINCIPLE The OPM500 series of optical power monitors employs photodiodes to measure optical power. Precision dual transimpedance input stages provide for high common mode rejection and linearity throughout the full dynamic range of the system. FIELDS OF APPLICATION These optical power monitors are particularly useful for the measurement and monitoring of optical power in the standard telecommunications bands. The output is a voltage linearly proportional to power. The fast response time at high signal-noise-ratio makes the OPM500 series particularly useful in systems control feedback loops, such as in fibre Artifex Engineering Dortmunder Str. 16-18 26723 Emden, Germany 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, including free beam input, make these units useful in a wide range of applications including nontelecom metrology. The proprietary auto-nulling function allows up to 7V of offset nulling. This is particularly useful for eliminating a DC signal component to concentrate on signal changes, such as during component burnin and life-time testing. Bandwidth selection and output polarity are also selectable via the TTL-compatible interface. mail: info@afx-eng.com http://www.afx-eng.com

Artifex Engineering Dortmunder Str. 16-18 26723 Emden, Germany mail: info@afx-eng.com http://www.afx-eng.com

ABSOLUTE MAXIMUM RATINGS Average Optical Power Temperature Range ORDERING INFORMATION Full order code: 950-2100nm FC fibre coupled SMA fibre coupled free beam For example, a single channel optical power monitor in a small OEM-style case for monitoring a 650nm SM-fibre coupled diode laser would be ordered as: OPM500GSF1 For mixed systems (mixed diodes or receptacles), please contact us. Small OEM-style case with gull wings for mounting

SPECIFICATIONS Si, InGaAs PARAMETER INPUT Wavelength range extended InGaAs InGaAs UV-Si Polarization Dependant Loss (PDL) Fibre type Power ranges (full scale) Noise equivalent power (NEPRMS) single mode, multi-mode ( core 62.5 µm; NA 0.275) FC, FSMA, free beam Receptacles OUTPUT Function Output scale Linear analogue Vout = scale x Pin 1 10 100 1 10 100 Output Range (full scale) Small signal (-1+1V) Large signal (-10+10V) Connectors Rise / Fall time (10% - 90%) Range 1 Range 2 Range 3 Range 4 Range 5 Range 6 Output impedance LOGIC Current required for switching Switching time POWER SUPPLY...

CASE STYLES 1 Channel TYPICAL PERFORMANCE CURVES Linearity 0,20 0,15

APPLICATIONS EXAMPLES The range of applications for optical power monitors is very broad. The OPM500 series is especially conceived for applications in the manufacturing environment of telecommunications components. Typical applications may be found in measuring: Components: lasers, ASEs, fibre coupled LEDs fibres, connectors, couplers switches, multiplexers, demultiplexers isolators, circulators filters, fibre bragg gratings (FBGs) amplifiers output power optical return loss (ORL) insertion loss polarization dependant loss (PDL) bandwidth crosstalk transient behaviour polarization...

INSERTION LOSS Optical Source Optical Source Important parameters: Accuracy Reproducibility * High quality reference cable with documented loss data ** Device Under Test

LINEAR OR LOGARITHMIC? The question often arises as to which signal processing technique is better: an output linearly or logarithmically proportional to the input optical power. The use of logarithmic amplifiers for optical power monitoring results from the large dynamic range of relevant powers. For example, the OPM500 series can measure from 1mW to 30pW: more than 7 decades of optical power. This dynamic range is far beyond the capabilities of a linear amplifier in a single gain range. However, by breaking the measurement into range subgroups, linear amplifiers can easily cover the same...

PRINCIPLES OF OPERATION The OPM150 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...

AUTO-NULL The auto-null function sets the momentary output signal to zero. In this manner, a constant overlying signal such as a background illumination or detector dark current may be eliminated. Small signal changes may now be detected more readily. Note: the output signal must be positive in order to use this function! The auto-null is activated by a HI signal on pin 20 of the DB25 interface or by a command $A on the USB interface. The reset to normal operation is obtained with a HI on pin 19 of the DB25 interface or the command $R on the USB interface. The value of the removed portion...

BANDWIDTH REDUCTION The OPM500 has four selectable analogue bandwidth ranges. Reduction of bandwidth is useful for suppressing high frequency noise from slower signals. The full bandwidth of the amplifier is 10kHz. Using the bandwidth reduction, this may be reduced to 1kHz, 100Hz or 10Hz. The bit setting on the DB25 interface is as follows: Bandwidth INDICATORS The condition of the instrument is indicated through two LEDs: Power (LED, green): The input current is too high for the gain range chosen. The overload indicator works only for positive signals and indicates and output greater than...