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Sanjay Yadav
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Level 1

 

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

1.jpg

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.

2.jpg

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

3.jpg

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 ):

4.jpg

                                                   

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):

     5.jpg                                                

 

where:

                            D   is the number of dropped channels

                            U   is the number of undisturbed channels

6.jpg

                                                                            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.

4.jpg

Use Cases

It will help Customer and Cisco Engineers understand the calculation of mathematical formulas and various parameters with ease and legibility..Customer can calculate Composite power for Multiplexers, De-Multiplexers,ROADMs, and WSSs;Can calculate affect of power change during addition and removal of channels.Also he can do multiple bidirectional conversions related to wavelength,frequency,loss etc.

 

  • Helps customers, partners and Pre-Sales with Pre-Deployment DWDM  configuration verification
  • Helps TAC engineer validate customer configuration without needing to setup any hardware/software device which intern helps reduce overall resolution time
  • Minimize the dependancy of knowing/understanding complex DWDM logic and configuration
  • Helps customers, Partners, TAC and AS Engineer with Interoperability testing

 

Supported Technology/Product:

MSTP,MSPP,ONS 15XXX,NCS1K,NCS2K,NCS4K and all other Optical Network Products

Comments

interesting tool

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