Agilent/HP 83485A Optical/Electrical plug-in
The Agilent 83485A optical/electrical plug-in module incorporates two measurement channels, one optical and one electrical. Each channel has two selectable bandwidth settings. In the lower bandwidth modes of 12.4 GHz, oscilloscope noise performance is excellent, while the 20 GHz mode allows greater fidelity for high speed signals. The Agilent 83485B optical/electrical plug-in module incorporates a 30 GHz optical measurement channel and a 40 GHz electrical channel. The electrical channel also has a reduced-bandwidth setting of 18 GHz for improved noise performance. 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 Instrument at a Glance channel is calibrated at 1310 nm and 1550 nm to provide both accurate display of the received optical waveform in optical power units and measurement of the signal's 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 Agilent 83485A optical/electrical plug-in module also is a calibrated SONET/SDH reference receiver that is measured to comply to ITU-TS (formerly CCITT) G.957 and Bellcore GR-253-CORE frequency response requirements for transmitter compliance testing. By either pressing a front-panel button or issuing an GPIB command, a fourth-order Bessel-Thomson filter is inserted into or removed from the measurement channel by a very repeatable Agilent 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 characterization and SONET/SDH compliance testing. The Agilent 83485B optical/electrical plug-in module includes a reference receiver path, similar to the Agilent 83485A, for 10 Gb/s transmitter test. Although no industry standards exist for 10 Gb/s testing, the Agilent 83485B has been designed to meet anticipated future standards.