Specifications

  • Optical Input
    Free Space
  • Detector Material
    Germanium
  • Detector Type
    PIN
  • Detector Diameter
    5 mm
  • Wavelength Range
    800-1700 nm
  • 3 dB Bandwidth
    150 kHz, 30 kHz, 30 kHz
  • Rise Time
    3.3 µs
  • Maximum Conversion Gain
    1.6 x 106 V/W
  • Maximum Transimpedance Gain
    2x103, 105, 2x106 V/A
  • Peak Responsivity
    0.8 A/W
  • NEP
    105 pW/√Hz
  • Common Mode Rejection
    40 dB
  • Saturation Power
    3 mW
  • Maximum Optical Power
    4 mW
  • Maximum Differential Power
    3 mW
  • Maximum Power per Photodiode
    6 mW/mm2
  • Maximum RF Power
    +12 dBm bei 50 Ω
  • Output Connector
    BNC
  • Output Impedance
    100 Ω
  • Power Requirements
    ±15 VDC or 9-V Battery
  • Thread Type
    8-32

Features

Reduces Common-Mode Noise by 40 dB

The balanced photoreceivers work by subtracting the photocurrent from two well-matched photodetectors. Common-mode noise that is present on both the reference and signal beams (such as laser intensity noise) is cancelled out and doesn’t appear as part of the signal. Any imbalance between the photocurrents generated by the reference and signal photodetectors, whether intentional or unintentional, is amplified and is seen as the signal. This reduces common-mode noise by up to 40 dB so that you can see your signal.

Large Area Diodes for Easy Alignment

These balanced optical receivers take the headache out of aligning and re-aligning your beams onto the photodetectors with their large detector diameters. This allows you to tweak your experiment without worrying about beam wander. Model 2317 has a 5-mm diameter Germanium photodiode covering 800-1700 nm.

Adjustable Gain Settings

The three-setting gain adjustment allows you to keep your signal from going off scale while you’re adjusting your experiment or measurement.

Ideal for Balanced Photodetection

Newport's balanced optical receivers are ideal for optical detection applications that require sensitive measurements and increased signal-to-noise. Balanced photodetection is a method that can very effectively cancel common mode noise and detect small signal fluctuations on a large DC signal. Detection methods in the time domain (such as femtosecond ultrasonics and frequency modulation spectroscopy) and frequency domain (like absorption spectroscopy), and coherent heterodyne detection (such as optical coherence tomography) can be substantially improved by using Newport balanced photoreceivers and can allow detection of signals not otherwise possible with other means. For more information, please see our application note A Survey of Methods Using Balanced Photodetection.

Example OCT Imaging System

Resources