OTDR Series e-Manual, D07-00-076P-RevC00 Page 11 of 107
4.2 Light Source
An optional light source is available and designed for generating continuous optical radiation.
The light source output is the same as the OTDR port and uses the same laser diodes and
optical splitter. The radiation power is stabilized with the help of external photodiode and power
stabilization circuit.
The light source has two operation modes: Continuous and Modulated/tone (270, 1000 and
2000Hz).
The average power at modulation mode is 2 times lower (3dB) than in continuous mode of
operation.
4.3 Optical Power Meter
The OPM is equipped with an InGaAs photodiode (1mm diameter) to measure optical power.
For standard power PM1 measurement range (+10dBm), radiation falls directly on the
photodiode. The OPM will support both MM and SM fiber with the APC or UPC connector type.
For extended measurement PM2 range (+25dBm), an integrating sphere with a photodiode is
used. Input power is attenuated by the integrating sphere by approximately 100 times.
The current of the photodiode is amplified and converted into digital form with the help of
analog-digital converter. The received digital signal is processed by microprocessor and the
value of the measured optical power is displayed.
4.4 Visual Fault Locator
The unit is equipped with an optional Visual Light Locator (VFL) to visually identify breaks in
the fiber typically hidden in the OTDR dead zone.
• Output power: 0 dBm (Typical)
• Operation modes: Continuous wave (CW) or 2Hz modulation
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