VeEX FX150, Руководство пользователя

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OTDR Series e-Manual, RevE00 Page 12 of 128
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). One or all wavelengths (Loop) can be used in OLTS measurement.
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.
The OPM will support both MM and SM fiber with the APC or UPC connector type. WaveID
can be enabled to detect source wavelength automatically when used with VeEX light sources
that also support WaveID. For more information on specifications, see the datasheet.
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.
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Output power: 0 dBm (Typical)
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Operation modes: Continuous wave (CW) or 2Hz modulation