3-11
IM AQ1200-01EN
Optical Pulse Measurement and
Analysis Conditions
3
2
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10
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14
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19
App
Index
20
Fiber-in-Use Alarm
Some models in the AQ1200x/AQ1205x use the same wavelength that is used in real communication
to make measurements. If communication light is present in the optical fiber that you want to measure,
the communication will be affected. When this communication light is present, we say that the fiber is
in use.
The fiber-in-use alarm is a feature that checks if communication light is being transmitted along the
optical fiber that you are trying to measure. If the fiber is in use, an alert message is displayed that
suggests you stop the measurement. If the input level of the communication light is –20 dBm to 0 dBm,
to prevent damage to the Instrument, the alert message is displayed repeatedly. If this occurs, stop
measuring. For details on starting and stopping measurements, see chapter 4. For details about the
message, see section 19.2.
On the AQ1200B and AQ1200C, because the light received at the wavelength for optical
communication is blocked (not detected), fiber-in-use alarms do not occur.
Plug Check
The plug check is a feature that checks the state of the connection between the Instrument and an
optical fiber. When you turn this feature on, you can prevent light from being transmitted from the
Instrument light source port if an optical fiber is not connected to the Instrument or if the fiber is not
connected correctly.
Off: Plugs are not checked.
On: Plugs are checked.
PON (Passive optical network)
If the optical fiber that you are trying to measure is connected to a PON system, because an
optical splitter for splitting the optical fiber is installed in the system, you will not be able to measure
optical pulses that are reflected from a position further away than the optical splitter using normal
measurement. This feature enables you to correctly measure optical pulses that are reflected from
positions such as this.
Off: Optical pulses excluding those from PON systems can be measured.
On: PON system optical pulses can be measured.
3.5 Setting Measurement Conditions
