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HP 83485A H92 Optical Electrical Module

The 83485A is an optical/electrical module. It incorporates two measurement channels, one optical and one electrical. Each channel has two selectable bandwidth setting. In the Lower bandwidth modes of 12.4 GHz, Oscilloscope noise performance is excellent, while the 20 GHz allows greater fidelity for high speed signals.

The integrated optical channel reduces mismatch loss variation by eliminating signal distorting cables and connectors associated with the use of external receivers in order to accurately characterize optical waveforms. The optical channel is calibrated at 1310 nm and 1550 nm to provide both accurate display of the received optical waveform in optical power units and measurements of the signal average power. In addition, the user cal feature provides for consistent accuracy at any wavelength between 1200 nm and 1600 nm using a source and power meter.

The HP Agilent 83485A optical/electrical plug-in module also is a calibrated SONET/SDH reference receiver that is measured to comply ITU-TS G.957 and Bellcore GR-253-CORE frequency response requirements for transmitter compliance testing. By either pressing a front panel button or issuing an HP-IB command, a fourth order Bessel-Thomson filter in inserted into or removed from the measurement channel by a very repeatable HP microwave switch. The switch removes the potential variability and the time wasted by manually inserting and removing the filter when alternating between high fidelity waveform charaterization and SONET/SDH compliance testing.


  • 12.4 GHz and 20 GHz Optical Channel
  • 12.4 GHz and 20 GHz Electrical Channel
  • Switchable SDH/SONET filter for transceiver compliance testing
  • Trigger channel input to the mainframe
    - see page 18 of specification/manual PDF

Click the PDF Specification for further information

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HP 83485A Optical Electrical Plug-In Module option H92

Optical/electrical, Unfiltered 2.85 GHz,1000-1600 nm, Singlemode, Filter 2488 and 9953 Mb/s, 12 and 20 GHz (electrical) for 86100A/B/C, DCA-J and DCA-X

Specifications of 83485A option H92

  • Electrical channel: 1
  • Electrical bandwidth: 12.4 GHz and 20 GHz
  • 12.4 GHz and 20 GHz Electrical Channel
  • Fiber input: 9/125 µm
  • Optical wavelength: 1200-1600 nm
  • Optical unfiltered bandwidth: 20 GHz
  • Number of filter: 2
  • Filter rate (option H92): 2488 and 9953 Mb/s
  • Sensitivity (smallest power for mask test): -10 dBm

Optical Interface connector 81000xI not included.

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