PH200 single-channel benchtop nanowatt low noise optical-to-electrical converter
- Wideband, precision optical/electrical converter
- Near shot noise performance at nanowatt optical signal levels
- DC to 1 MHz bandwidth on 1 µA range, 3 MHz on 100 µA range
- Includes calibration check switch
- Manual or remote control
- Logarithmic signal monitor LED and overload LED
- Furnished with universal plug-in power supply and optical post mount
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The PH200 is a compact, integrated, DC-coupled free-space optical to electrical converter. It uses a unique photon-coupled transimpedance architecture to provide an unprecedented combination of megahertz bandwidth and shot noise limited noise performance at nanoampere photocurrents.
On its most sensitive range, full scale is 1 µA photodiode current, with total noise typically 6 dB above the shot-noise limit at 20 nA and less than 2 dB above shot noise above 200 nA. Bandwidth is over 1 MHz, one to two orders of magnitude above typical low-level, low noise TIAs. Ease-of-use features include pushbutton calibration check, LEDs to indicate optical input level and overload, and a D9 connector for remote control, making the PH200 ideal for both optical bench and embedded/OEM applications.
The PH200 is shot noise limited above 60 nA, its noise approaching 1.76 dB above shot noise at larger currents. The PH200's standard photodiode has a peak QE of 0.9 near 900 nanometers. Optional InGaAs (900 to 1700 nanometers) and Ge (350 to 1800 nanometers) detectors are also available.
The PH200 was designed in collaboration with Phil Hobbs, principal of ElectroOptical Innovations and author of Building Electro-Optical Systems.
| FUNCTION | Single-channel low-noise analog optical-to-electrical converter |
| INPUT | PH200-1 Si PIN free space detector with 0.275" tapered cylindrical aperture Singlemode or multimode fiber bundle, FC and ST connectorized detectors optionally available |
| WAVELENGTH | 400 to 1100 nm, standard NIR optionally available |
| DETECTOR AREA | 2.65 mm x 2.65 mm (7.0 mm2) |
| TRANSRESISTANCE | 10 M (High gain setting), 100 k (Low-gain setting) Front panel slide switch or remote signal sets gain |
| OUTPUTS | SIGNAL: +10 V per µA (high gain, Hi-Z load) +100 mV per µA (low gain, Hi-Z load) +5 V per µA (high gain, 50Ω load) +50 mV per µA (low gain, 50Ω load) SIGNAL source impedance: 50Ω MON: +10 V per µA (high gain, Hi-Z load) +100 mV per µA (low gain, Hi-Z load) MON source impedance: 1 kΩ |
| BANDWIDTH | DC to > 1 MHz, -3dB (Iphoto > 10 nA, low range) DC to > 3 MHz, -3dB (Iphoto > 1 µA, high range) |
| RISE/FALL TIME | < 350 ns, 10 to 90 % (Iphoto > 10 nA, low range) < 100 ns, 10 to 90 % (Iphoto > 1 µA, high range) |
| NOISE |
≤ 2dB above shot noise (Iphoto > 300 nA) ≤ 3dB above shot noise (Iphoto > 100 nA) ≤ 6dB above shot noise (Iphoto > 20 nA) |
| INPUT CURRENT RANGE | 0 to 1 µA (low range), 0 to 100 µA (high range) |
| OFFSET CURRENT | < 10 nA at 25°C |
| OPERATING TEMPERATURE | 0 to 60°C; extended MIL/COTS ranges available |
| POWER | +15 V at 250 mA, nominal 2.1 mm x 5.5 mm barrel power connector J15 Universal Wall-Plug Adapter included |
| CONTROLS | Front Panel: High / Low GAIN slide switch CAL pushbutton switch injects 1 µA (Hi Gain) or 100 µA (Low Gain) Remote: TTL compatible Gain and CAL remotely settable via onboard D9 female connector |
| CONNECTORS | 0.275" tapered cylindrical optical input aperture (standard) Optional FC, ST or fiber bundle attachment inputs BNC electrical SIGNAL and MON outputs 2.1mm x 5.5mm barrel power connector D9 female REMOTE connector: remote power input, TTL compatible active low CAL and GAIN selection, Hi-Z monitor out and active high CLIP signal |
| INDICATORS | LEDS: green power, orange signal, red clip |
| PACKAGING | 4.75" (L) x 4.80" (W) x 1.25" (H) extruded black anodized aluminum enclosure Includes black anodized base plate with (5)1/4" – 20 threads on 1" square |
Datasheet: PH200 nanowatt low noise optical-to-electrical converter
Manual: PH200 nanowatt low noise optical-to-electrical converter
PH200-1 : Single-channel benchtop nanowatt low noise optical-to-electrical converter