Difference between WDM Add/Drop and FBG/Coupler

[Parikhit Dutta]

Hello,

I have been trying to figure out the fundamental difference between WDM Add/Drop and and a combination of FBG with Coupler in OptiSystem.

Of all that I have read, OADM (Optical Add Drop Multiplexers) is used in WDM systems for combining several optical signals. It has functionality for adding/dropping select wavelengths and usually consists of an FBG and circulators.

I read that in the OptiSystem Documentation that the WDM Add Block consists of filters followed by a combiner while the WDM Drop consists of a splitter followed by filters. In a certain application that I am trying to simulate I am splitting several optical components generated by an MZM through WDM Drop blocks and then recombining select components using WDM Add blocks. I then replaced the WDM Drop Blocks by an FBG (with Optical Rectangular Filter to limit the undesired components). The WDM Add Blocks were replaced by Optical Couplers. I expected the response in both the cases to be the same. However they differ greatly. Am I making a fundamental mistake? Or is there something that I have missed?

Thank you.

[Damian Marek]

Without looking at your project it is hard to say why it is giving a difference, but as I said the couplers act differently than a power combiner so I would try using a Power Combiner.

[Heitor Galvao]

It is possible to attach the project? What application are you using?

[Parikhit Dutta]

Hello,

I had created one more thread here and uploaded the files therein. Here is the link. I do hope that helps.

Power Penalty Calculation

[Atul Sharma]

Hi Parikhit.

Can you help me. I have a question you know i am testing a signal addition in WDM add component.. I have a confusion regarding the functionality of the add component. If i am transmitting a signal from the source end ( CW Laser) which is modulated ( using particular modulation scheme) and then supply this modulated signal to the add component ( whose reference wavelength is 1553nm or 193.1 THz) , Now my question is if the signal that is added by the add component is self modulated or i can change the different parameters of that signal.
I would like to hear from you.
Regards
Atul Sharma

[Author]

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