Variable Gain Photoreceiver – Fast Optical Power Meter
Features
InGaAs-PIN detector, active diameter 0.3 mm (free space versions), 80 µm integrated ball lens (FC version)
Spectral range 900 - 1700 nm
Very low noise, NEP down to 6 fW/√Hz
Bandwidth up to 500 kHz
Conversion gain adjustable from 1 x 103 up to 1 x 1011 V/W
Optical free-space input 1.035"-40 threaded, alternatively 25 mm diameter unthreaded
Fiber optic input available as permanently mounted FC-input (for calibrated precision measurements)
Factory calibrated at 1550 nm (fiber optic FC version only)
Full manual and remote control capability
Applications
All-purpose very low-noise photoreceiver (O/E converter)
Time resolved optical pulse and power measurements
Optical front-end for oscilloscopes, spectrum analyzers, A/D converters and lock-in amplifiers
Fast fiber optic power meter
Block Diagram
Specifications
Test conditions
VS = ±15 V, TA = 25 °C, output load impedance 1 MΩ
Gain
Conversion gain
1 x 103 ... 1 x 1011 V/W (@ 1550 nm, output load ≥ 100 kΩ)
Gain accuracy
±1 % electrical, between settings
Conversion gain accuracy
OE-200-IN2-FST/FS (@ POPT ≤ 2 mW, 1550 nm)
free space ±15 %
OE-200-IN2-FC (@ POPT ≤ 1 mW, 1550 nm)
fixed fiber input connector ±5 % guaranteed by factory calibration*
* Factory verified with SM 9/125, FC/APC, NA 0.13 (when using FC/PC fiber connector, coupling efficiency may differ slightly). In general, coupling efficiency depends on fiber type. Standard SM 9/125 fibers with low numerical aperture (NA) are recommended. Fibers with core diameter larger than 62.5 µm will significantly reduce the coupling efficiency.
Gain drift
see table below
Frequency Response
Lower cut-off frequency
DC / 1 Hz, switchable
Upper cut-off frequency(–3dB)
up to 500 kHz (see table below), switchable to 10 Hz
Detector
Detector type
InGaAs-PIN photodiode
Active area
Ø 300 µm (free space versions) Ø 80 µm, integrated ball lens (FC version)
Spectral range
900 - 1700 nm
Sensitivity
0.95 A/W (@ 1550 nm)
Input
Input offset current (dark current)
2 pA typ.
Input offset drift
see table below
Input offset compensation range
±600 pA, adjustable by offset potentiometer or ±400 pA, adjustable by external control voltage
Optical CW saturation power
see table below
Noise equivalent power (NEP)
see table below
Performance Depending on Gain Setting
Gain setting (low noise) (V/W)**
103
104 105 106 107 108 109 Upper cut-off frequency (–3 dB)
500 kHz
500 kHz 400 kHz 200 kHz 50 kHz 7 kHz 1.1 kHz Rise/fall time (10 % - 90 %)
700 ns
700 ns 900 ns 1.8 µs 7 µs 50 µs 300 µs NEP (/√Hz)**
22 pW
2.5 pW 500 fW 150 fW 47 fW 15 fW 6 fW Measured at
10 kHz
10 kHz 10 kHz 1 kHz 1 kHz 100 Hz 100 Hz Integr. input noise (RMS)***
23 nW
2.8 nW 650 pW 180 pW 51 pW 7.5 pW 1.1 pW Input offset drift (/°C)**
40 nW
4 nW 0.4 nW 34 pW 3.4 pW 0.5 pW 0.4 pW Gain drift (/°C)
0.008%
0.008% 0.008% 0.01% 0.01% 0.01% 0.02% Optical CW saturation power**
2 mW
1 mW 0.1 mW 10 µW 1 µW 0.1 µW 10 nW Gain setting (high speed) (V/W)**
105
106 107 108 109 1010 1011 Upper cut-off frequency (–3 dB)
500 kHz
500 kHz 400 kHz 200 kHz 50 kHz 7 kHz 1.1 kHz Rise/fall time (10 % - 90 %)
700 ns
700 ns 900 ns 1.8 µs 7 µs 50 µs 300 µs NEP (/√Hz)**
15 pW
2.0 pW 520 fW 150 fW 48 fW 15 fW 7 fW Measured at
10 kHz
10 kHz 10 kHz 1 kHz 1 kHz 100 Hz 100 Hz Integr. input noise (RMS)***
13 nW
1.9 nW 560 pW 160 pW 48 pW 7.2 pW 1.1 pW Input offset drift (/°C)**
40 nW
4 nW 0.4 nW 34 pW 3.4 pW 0.5 pW 0.4 pW Gain drift (/°C)
0.008%
0.008% 0.008% 0.01% 0.01% 0.01% 0.02% Optical CW saturation power**
0.1 mW
10 µW 1 µW 0.1 µW 10 nW 1 nW 0.1 nW ** referred to 1550 nm
*** The integrated input noise is measured with a shaded input in the full bandwidth (“FBW”)
setting (referred to 1550 nm).
The input referred peak-peak noise can be calculated from the RMS noise as follows: P Input noise peak-to-peak = P Input noise RMS x 6
The output noise is given by:
U Output noise RMS = P Input noise RMS x gain
U Output noise peak-to-peak = U Output noise RMS x 6 = PInput noise RMS x gain x 6
The integrated noise will be reduced considerably by setting the low pass filter to “10 Hz” instead of “FBW”. This is especially useful for continuous wave (CW) measurements.
Output
Output voltage range
±10 V (@ ≥100 kΩ output load)
Max. output current
±30 mA (short-circuit proof)
Output impedance
50 Ω (terminate with ≥100 kΩ)
Indicator LED
Function
overload
Digital Control Control input voltage range
LOW bit: –0.8 ... +1.2 V, HIGH bit: +2.3 ... +12 V
Control input current
0 mA @ 0 V, 1.5 mA @ +5 V, 4.5 mA @ +12 V
Overload output
nonactive: <0.4 V, @ 0 … –1 mA active: typ. 5 ... 5.1 V @ 0 ... 2 mA
Ext. Offset Control
Control voltage range
±10 V
Offset control input impedance
20 kΩ
Conversion factor
40 pA/V
Power Supply
Supply voltage
±15 V (±14.75 ... ±16.5 V)
Supply current
+110/–80 mA (depends on operating conditions, recommended power supply capability min. ±200 mA)
Stabilized power supply output
±12 V, max. 50 mA, +5 V, max. 30 mA
Case
Weight
360 g (0.79 lb)
Material
AlMg4.5Mn, nickel-plated
Temperature Range
Storage temperature
–40 ... +80 °C
Operating temperature
0 ... +60 °C
Absolute Maximum Ratings
Optical input power (CW)
20 mW
Digital control input voltage
–5 V/+16 V relative to digital ground DGND (pin 9)
Analog control input voltage
±15 V relative to analog ground AGND (pin 3)
Power supply voltage
±20 V
Connectors
Input
OE-200-IN2-FST 1.035"-40 threaded flange for free space applications
OE-200-IN2-FS 25 mm unthreaded flange for free space applications
OE-200-IN2-FC FC fiber optic connector
Output
BNC jack (female)
Power supply
Lemo® series 1S, 3-pin fixed socket (mating plug type: FFA.1S.303.CLAC52)
Pin 1: +15 V
Pin 2: –15 V
Pin 3: GND
Control port
Sub-D 25-pin, female, qual. class 2
Pin 1: +12 V (stabilized power supply output)
Pin 2: –12 V (stabilized power supply output)
Pin 3: AGND (analog ground for pins 1 - 8)
Pin 4: +5 V (stabilized power supply output)
Pin 5: overload output: HIGH = overload (referred to pin 3)
Pin 6: signal output (connected to BNC)
Pin 7: NC
Pin 8: input offset control voltage
Pin 9: DGND (ground for digital control pins 10 - 14)
Pin 10: digital control input: gain, LSB
Pin 11: digital control input: gain
Pin 12: digital control input: gain, MSB
Pin 13: digital control input: AC/DC
Pin 14: digital control input: high speed / low noise
Pin 15 - 25: NC
Scope of Delivery
OE-200-IN2, internally threaded coupler ring (FST version only), Lemo® 3-pin connector, datasheet, transport package
Remote Control Operation
General
Remote control input bits are opto-isolated and connected by a logical OR function to the local switch settings. For remote control set the corresponding local switches to “Remote”, “AC” and “H” and select the desired setting via a bit code at the corresponding digital inputs. Mixed operation, e.g. local AC/DC setting and remote controlled gain setting, is also possible. The switch setting “FBW / 10 Hz” of the low pass signal filter is not remote controllable.
Gain setting
Low noise
High speed
Gain (V/W)
Gain (V/W)
Pin 12
Pin 11
Pin 10
Pin 14=HIGH
Pin 14=LOW
MSB
LSB
103
105
LOW
LOW
LOW
104
106
LOW
LOW
HIGH
105
107
LOW
HIGH
LOW
106
108
LOW
HIGH
HIGH
107
109
HIGH
LOW
LOW
108
1010
HIGH
LOW
HIGH
109
1011
HIGH
HIGH
LOW
Gain settling time
<150 ms
AC/DC setting
Coupling
Pin 13
AC
LOW
DC
HIGH
Conversion Gain
Dimensions OE-200-IN2-FST (1.035"-40 threaded free space input):
OE-200-IN2-FS (25 mm dia. unthreaded free space input):
商品属性 [活跃直径] 0.3 mm [光谱范围] 900 - 1700 nm [NEP] down to 6 fW/√Hz [带宽] up to 500 kHz [变频增益 ] 1 x 103 up to 1 x 1011 V/W