Olson Technology OTOR-300 - Manual (Page 5)

025-000442 REV X2 Page 5
If the optical input power is in excess of +3dBm (2mW), an optical attenuator should be utilized to reduce the input to
+3dBm or lower. The OLSON TECHNOLOGY Model OTOA optical attenuator is ideal for this application.
3. The unit will function at either 1310nm or 1550nm wavelength. However, because the optical detector efficiency is
different at the different wavelengths, there is an internal “Receive Power” calibration jumper plug that needs to be in
the proper position depending upon the input optical wavelength. The diagram of Figure 1 shows the proper position
of this plug for either wavelength. The unit is shipped with the jumper plug in the 1310nm position. For the operators
convenience there is an “Internal Pad Selection Chart” on the cover of the receiver.
4. After the internal attenuator is set for optimum performance, the output level should be set with the front panel “RF
Level Adj.” control. It is recommended that the output level should be set for between +40dBmV and +45dBmV. An
ideal method to set this is with the front panel -20dB “RF Test Point” and the output terminated in the actual load it will
be operating with. If carriers are utilized to set the units output power, adjust the output of the test point for between
+20dBmV and +25dBmV per carrier. If data signals are utilized which appear on a spectrum analyzer as noise, they
can be set up with the output level at the test point between -28dBmV/Hz and -23dBmV/Hz utilizing the noise marker
on the spectrum analyzer. Setting the output level to the levels >-45dBmV will result in the degraded performance.
Although the unit will function at optical input levels as low as -14dBm, the output level attainable will be less than
+45dBmV. +45dBmV will be attainable at optical input levels from typically -11dBmV to -12dBmV. For every 1dB
decrease in optical input power the output level will decrease by 2dB. At -14dBm optical power input, the maximum
output level will be approximately +40dBmV.
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