10-3
IM AQ1300-01EN
Optical Power Measurement (AQ1300 Option)
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App
Index
Explanation
Wavelength
The light receiving element of the optical power measurement section has a wavelength sensitivity
distribution. The AQ1300 measures optical power more accurately by adjusting the sensitivity
according to the specified wavelength.
You can set the measurement wavelength to one of the following values.
850 nm, 1300 nm, 1310 nm, 1490 nm, 1550 nm, 1625 nm, 1650 nm
Set the wavelength according to the test interface as indicated in the table below.
Test Interface
Wavelength
100BASE-FX (SFP)
1310 nm
1000BASE-SX (SFP)
850 nm
1000BASE-LX (SFP)
1310 nm
10GBASE-SR (XFP)
850 nm
10GBASE-LR (XFP)
1310 nm
10GBASE-ER (XFP)
1550 nm
Modulation
You can set the frequency of the measured light to one of the following options.
CW (continuous light), 270 Hz, 1 kHz, 2 kHz
Unit
You can set the optical power display unit to one of the following options.
dB (relative value), dBm (absolute value), W (absolute value)
• The following prefixes are attached to W: m (10
–3
), m (10
–6
), and n (10
–9
).
• The relationship between the absolute values dBm and W is indicated below.
P
dBm
= 10 × log (P
w
/10
3
)
where P
dBm
is the optical power in units of dBm and P
w
is the optical power in units of W.
Reference
You can set a reference and display measured values as relative values (display their difference from
the reference).
• Press the DREF soft key to make the displayed measured value the reference and display
subsequent measured values as relative values. The unit will change to dB.
• Press the DREF soft key or set the unit to dB to display the Reference box in the Power Meter
screen.
• You can set the reference manually in the Reference box. The range is –70 to 5 dBm.
• If you set the unit to dBm or W, the Reference box disappears and the measured values are
displayed as absolute values.
Average Count
Averages of the measured values are displayed. You can set the number of values to average to one
of the following options.
1, 10, 50, 100
10.2 Setting Optical Power Measurement Conditions and Holding the Display
