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Tektronix SD-42
optical-to-electrical converter
SD-42 O/E converter

Compatible with 11800 series scopes

Produced from 1990 to 1998

Manuals – Specifications – Links – Pictures

The Tektronix SD-42 is an optical-to-electrical converter.

From Tektronix' site:

The SD42 Optical-to-electrical Converter head can be used to analyze optical signals in the 1000 nm to 1700 nm wavelength range. The pulse response of the measurement system is less than 55 ps FWHM (Full-width, Half-maximum), which is equivalent to a calculated bandwidth of DC to 6.4 GHz. The electrical output on the front panel is coupled to the adjacent sampling head via the semi-rigid coaxial link provided.

The SD42 is also equipped with an optical power meter for average power monitoring through a pair of voltage outputs on the front panel. Power from 5 nW to 5 mW can be measured.


Pulse response 55 ps FWHM
Bandwidth DC to 6.4 GHz
Conversion factor 25 mW/V (40 mV/mW)
Optical wavelength 1000 to 1700 nm (calibrated for use with a single-mode fiber input at 1300 nm)
Linear Response Range <25 mW peak power / <5 mW mean power
Maximum Nondestructive Input 75 mW peak power / 10 mW mean power
Equivalent Display Noise 10 μWRMS typ. with SD-22, 33 μWRMS typ. with SD-24/SD-26 (<10 μWRMS typ. with smoothing)
Input FC/PC connector