- Introduction to Essential Utility for Optical Network Professionals
- Snapshot of utility
- Feature Supported
- Composite Power calculator
- Net Composite power Change when some channels are added/removed
- Direct Conversion for multiple parameters
- Use Cases
- Supported Technology/Product:
Introduction to Essential Utility for Optical Network Professionals
https://cway.cisco.com/tools/OpticalProfessionalCalculator/
This utility will serve as ready-made handy calculator/conversion requirement for Optical Network Professionals specially dealing with DWDM /MSTP/Optical Fiber/Photonics technologies. Almost every Optical Network Engineer uses; specially operations, planning and services needs in their daily office routine. It will help Customer and Cisco Engineers understand the calculation of mathematical formulas and various parameters with ease and legibility.
All Optical Professional can use this along with various Data-center and Routing engineers dealing with optical hand off at POI’s (Point of inter-connectivity).
Snapshot of utility
Feature Supported
- Composite Power calculator
- Net Composite power Change when some channels are added/removed.
- Direct Conversion for multiple parameters.
Composite Power calculator
We always need to calculate the composite power for multiplexed channels as optical multiplexing follows additive and subtractive law of optical power distribution. Following section will be used for calculation.
For this section, we are using following formula:-
Pcomposite = Pchannel + 10logN – Insertion loss
(where N is the number of channels)
We can exclude Insertion Loss if we do not require it. Fill the text box with Zero.
Net Composite power Change when some channels are added/removed
The power change can be quantified as the ratio between the number of channels at the reference point after the channels are added or dropped and the number of channels at that reference point previously. We can consider composite power here and each channel at same optical power in dBm.
So whenever we add or delete number of channels from a MUX/DEMUX/FILTER/WSS following equations define the new changed power.
For the case when channels are added (as illustrated on the right side of Figure 1 ):
where:
A is the number of added channels
U is the number of undisturbed channels
For the case when channels are dropped (as illustrated on the left side of Figure 1):
where:
D is the number of dropped channels
U is the number of undisturbed channels
Figure 1
For example:
- adding 7 channels with one channel undisturbed gives a power change of +9 dB;
- dropping 7 channels with one channel undisturbed gives a power change of –9 dB;
- adding 31 channels with one channel undisturbed gives a power change of +15 dB;
- dropping 31 channels with one channel undisturbed gives a power change of –15 dB;
Direct Conversion for multiple parameters
This section consists of following conversions:-
- dBm to mW
- mw to dBm
- THz to nm
- nm to THz
- Coupling ratio to Insertion Loss introduced decibel value(Tap % to IL)
- Channel spacing to wavelength spacing.
