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Parameter
Definition |
Example
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Wavelength
Range (nm) is defined as wavelength range over
which the Optical
Performance Monitor (OPM) or Optical
Channel Monitor (OCM) can measure the power and
wavelength of the optical channels. |
1530.33
- 1563.05 nm
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Channel
Number is the total number of channels defined
in a channel plan that the OPM / OCM can identify. |
42
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Channel
Spacing (GHz) is the equal frequency separation
between two neighboring channels in DWDM system. |
100
GHz
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Input Wavelength
Tolerance (GHz) defines the maximally allowed
deviation of input laser away from ITU grid or channel
plan. This parameter defines the minimum channel spacing.
For example, for Input wavelength
tolerance = ±5 GHz, channel spacing = 50 GHz,
the minimum channel spacing will be 40 GHz in the
worst case. |
±5
GHz
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Adjacent
Channel Power Difference (dB) is maximum power
difference between any two adjacent channels |
12
dB
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Non-adjacent
Channel Power Difference (dB) is maximum power
difference between any two non-adjacent channels |
20
dB
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Maximum
Input Power (dBm) is total input optical power
of all channels that is allowed to the OPM. |
23
dBm
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Channel
Input Power Range (dBm) is the measurement power
range of each channel when power and wavelength can
be correctly reported. |
-40
to -10 dBm
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Absolute
Channel Power Accuracy (dB) is defined as ±Max
(|DPi|)
over all the channels and operating temperature range,
where DPi
is the power measurement error against a calibrated
power meter for the channel i. |
±
0.5 dB
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Relative
Channel Power Accuracy (dB) is defined as
the difference between the maximum and the minimum
values of the power measurement error data across
Spectral Range (all channels) at a measurement
temperature. The worst-case value over all temperatures
is used to specify Relative Channel Power Accuracy.
|
0.6
dB
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Power
Measurement Repeatability (dB) is the variation
of a channel power measurement on a 1-minute interval
at fixed peak power and polarization and at a constant
temperature. |
±
0.1 dB
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PDL
(dB) is the power difference between the two extreme
polarization states. |
0.3
dB
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Absolute
Wavelength Accuracy (pm) is defined as ±Max
(|Dli|)
over all the channels and operating temperature range,
where Dli
is the wavelength measurement error against a calibrated
wavelength meter for the channel i. |
±
50 pm
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Relative
Wavelength Accuracy (pm) is defined as the difference
between the maximum and the minimum values of the
wavelength measurement error data across Spectral
Range (all channels) at a measurement temperature.
The worst-case value over all temperatures is used
to specify Relative Wavelength Accuracy. |
60
pm
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OSNR
(dB) is measured as the ratio of a coherent signal
power to a band-limited broadband noise source, normalized
to 0.1-nm spectral window. |
28
dB
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Maximum
OSNR (dB) is the highest OSNR that can be
measured and still meet the OSNR accuracy and
repeatability requirements. Its value depends
on the input channel power level, noise floor,
and filter isolation. See a typical example in
the graph.
|
28
dB
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OSNR Range
is the maximum and minimum OSNR values, within which
OPM can report OSNR with OSNR error < OSNR Accuracy. |
10
~ 25 dB
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OSNR
Accuracy (dB) is defined as ±Max (|DOSNRi|)
over all the channels and operating temperature
range, where DOSNRi
is the OSNR measurement error against a calibrated
Optical Spectrum Analyzer for the channel i.
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±
1.5 dB
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Noise
Floor (dBm) is defined as electronics noise without
light input. |
-60
dBm
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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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Response
Time (ms) is the time required to perform the
measurements of OSNR, power, and wavelength for all
channels and transfer these values over the communications
interface to the central controller. |
500
ms
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Power
Consumption (W) is defined as peak electrical
power when the OPM operates. |
2
W
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Operating
Temperature (°C) is the ambient temperature
range over which the device can be operated and maintain
its specifications. |
-5
to 65 °C
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Storage
Temperature (°C) is the ambient temperature
range over which the device can be stored without
damage and can be operated over operating temperature
according to its specifications. |
-40
to 85 °C
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