Compare Model Drawings, CAD & Specs Wavelength Range Maximum Conversion Gain Peak Responsivity NEP Thread Type Availability Price
300-1050 nm 9.4x106 V/W 0.5 A/W 0.25 pW/√Hz 8-32
300-1050 nm 9.4x106 V/W 0.5 A/W 0.25 pW/√Hz M4
900-1700 nm 18.8x106 V/W 1.0 A/W 0.19 pW/√Hz 8-32
900-1700 nm 18.8x106 V/W 1.0 A/W 0.19 pW/√Hz M4


  • Detector Diameter
    2001: 0.9 mm
    2011: 0.3 mm
  • Detector Material
    2001: Silicon
    2011: InGaAs
  • Detector Type
  • 3 dB Bandwidth
    DC to 200 kHz
  • Fiber-Optic Connector
  • Maximum Transimpedance Gain
    18.8x106 V/A
  • Rise Time
    2 µs
  • Saturation Power
    2001: 10 mW @ 850 nm
    2011: 10 mW @ 1600 nm
  • Output Connector
  • Output Impedance
    16 Ω
  • Power Requirements
    Two internal 9V batteries


Silicon or InGaAs Versions

The silicon photodetector version (2001) has a 0.9 mm diameter PIN detector that provides wavelength coverage from 300-1050 nm.  The InGaAs photodetector version (2011) has a 0.3 mm diameter PIN detector that provides wavelength coverage from 900-1700 nm.

Adjustable high-pass and low-pass filters

Independent control of the low and high-frequency corners allows you to reject unwanted noise effectively. The single-pole filters provide a slope of –6 dB/octave with less than 90° phase shift. The DC÷30 setting prevents your signal from going off-scale due to DC amplitude fluctuations, without attenuating fast signals. The high-pass filter can be adjusted to eliminate residual 60-Hz noise, and the independent low-pass filter can be set to dampen noisy signals. The upper left knob adjusts the low-frequency corner and the upper right knob adjusts the high-frequency corner. The corner frequency increases by a factor of three with each full clockwise turn. The photoreceivers have ten settings for each frequency corner, creating a wide variety of frequency responses.

Variable-gain Transimpedance Amplifier

Variable gain of up to 90 dB in 10-dB steps gives you a useful input range from 1 pW to 10 mW. For small signals requiring 80-dB or greater gain, the maximum bandwidth is reduced from 200 kHz to 20 kHz.

Flexibility & High Performance for a Wide Range of Applications

These photoreceivers can be used for many different applications, including aligning fibers in high-speed-photodetector test and pigtailing setups. They can also be employed as low-noise, DC-coupled photoreceivers/preamplifiers in servo-control systems requiring near-zero phase shifts at up to 100 kHz. Or they can be used in lock-in amplifier systems to take advantage of their shot-noise-limited performance and 90-dB maximum gain. And by correlating their output voltages to a calibrated power meter, these photoreceivers can also serve as sensitive power sensors.

Model 2001-FC photoreceiver used in conjunction with Model 9131 fiber aligner to optimize the coupling efficiency of incoming laser light into an optical fiber.