Problem in simple WDM system

[Raja masud]

Hi guys,

I have faced a problem in a simple WDM system, i have upload a osd file. ok the idea is simple, i want Multiplexes two pulse with different frequency by a ideal mux. so at the output of mux i will see 2 pulse by the Optical Time Domain Visualizer. But i have got 2 problem:

(1) There are two pulse in “Optical Time Domain Visualizer_2” of figure-1; but there is one pulse in “Optical Time Domain Visualizer_5” of figure-2, and another is missing. But, the OSA and WDM analyzer of both figure shows that there are two signal with different frequency and same power. It is happened, when difference between two frequency of two pulse is grater than 6 THz.

(2) There is a dark spot (may be interference) between two adjacent pulse in “Optical Time Domain Visualizer_2” of figure-1. we know that 2 different frequency do not interfere each other, but how this dark spot is generated?

if anyone know the answer then plz share.

Regards

[Raja masud]

here is the file

Attachments:

1. Problem-with-mux.osd

[Sasha]

Hello Raja,

For your second question, I think it is the overlapping of the two signals (i.e you can check the time duration of the signal).

Regards,
Sasha

[Raja masud]

Hi Sasha,

Thank you for your answer, and i am sorry for my let replay.

What about if i use the rectangular pulse? i have uploaded a osd file, where you can see spicks between two pulses. what do you think, why this happen?

Thanks again
RAJA

Attachments:

1. Project111.osd

[Author]

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