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Parameter
Definition |
Example
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Wavelength
Tuning Range
(nm) is the spectral range over which a ROADM's
center wavelength can be tuned and performance specification
can be met.. |
1527.994
~ 1563.047 nm
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Wavelength
Tuning Resolution (GHz)
is the minimum tuning step of a tunable filter. |
10
pm
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Passband
Width @ X-dB Down (GHz)
is the full spectral width centered at the ITU grid
measured at X-dB below the minimum insertion
loss point. Usually, X = 0.5, 1, 3 and 20. |
35
GHz @0.5-dB down for 100 GHz channel spacing
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Peak
Insertion Loss (dB)
is
power difference between the 0-dB level and the maximum
power level measured within a given passband window. |
2.5
dB
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Polarization
Dependent Loss (PDL) (dB) is the difference between
the maximum and minimum insertion loss over all polarization
states within a given passband window. |
0.3
dB within CW ± 12 GHz
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Polarization
Mode Dispersion (PMD) (ps) is the maximum Differential
Group Delay within a given passband width. |
0.3
ps
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Chromatic
Dispersion (CD) (ps/nm) is the derivative of the
Group Delay versus wavelength within a given passband
width. |
±
25 ps/nm within CW ± 12 GHz
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Wavelength
Setting Error (GHz) is the difference between
a channel central wavelength (usually defined using
3-dB bandwidth) and the target wavelength (usually
the ITU grid) during tuning. |
±
4 GHz
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Wavelength
Repeatability (GHz) is the repeatability of a
channel central wavelength (usually defined using
3-dB bandwidth) during repeated tuning. |
±
1 GHz
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Wavelength
Temperature Dependence (pm/°C) is the rate
of a channel central wavelength versus temperature. |
±
1 pm/°C
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Optical Return Loss
(dB) is the ratio between the input power and the
reflected power over all polarization states at each
port , RL = -10×log10(Pr/Pin). |
40
dB
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Tuning
Speed (s) is the time needed by a tunable filter
to tune from one channel to another. It is dependent
on the originating and destination channels. The longest
time required is specified. |
6
s
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Operating
Temperature (°C) is the ambient temperature
range over which the device's performance spec can
be met. |
-5
to 65 °C
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Storage
Temperature (°C) is the ambient temperature
range over which the device can be stored without
affecting its intended application afterwards. |
-40
to 85 °C
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