wdm multiplexer parameters

HELLO ZAKARYA..
As far as setting parameters of multiplexer are concerned i will suggest you to increase the bandwidth from 10 GHz which is a default value to 20 or more for obtaining good results..i have noticed the same when i increased the bandwidth..
Now as far as filter order is concerned, higher the order more smooth is the response..so i ll suggest you to keep order 4 or more..it also depends on the application as well..
about the depth i will also like to know it..

Thanks & regards

HELLO ZAKARYA SAIDI..
Well you have made an important point here..you know it was discussed in some post regarding selection of bandwidth of WDM multiplexer and it was mentioned there the performance gets better with increasing the bandwidth but explanation was given on basis of simulation..the theoretical reason was not mentioned..here i would like to ask u if u can share that paper where bandwidth is set based ob bit rate…

it will be highly helpful..
Thanks & regards

HI ZAKARYA SAIDI..

Thanks for sharing the paper..I will definitely go through this paper for further information once i get time and shall let you..

Thanks & regards

Well just went through the paper.. you are right.
What he has done is that he has compared results for various modulation schemes ( NRZ, RZ , CSRZ , MDRZ ) for various data rates.. he has used different amplifiers as he has mentioned in each case and calculated for the results.. he has done comparison on bases of amplifiers but as for as selection of bandwidth for multiplexer is concerned , he has not mentioned any reason why he has done that.. i don’t know what possibly is the logic behind this. I hope someone helps on this.
Thanks & regards

Hi all..
I have checked my results on values less than 10 Ghz , and results were seen to be improving.
I had checked on 8 channel wdm system. I’m still not sure how this bandwidth parameter of wdm mux/demux affect performance.
It would be really good if this thing gets clear.

Regards
Naazira.

Yes Fayiqa Naqshbandi..

yes i know. In fact I myself had a case where in results improved by increasing the bandwidth as well.
Since I have had both the cases, I have not been able to conclude about the exact impact of varying this bandwidth value.

Regards.

Hi all,

I agree with fayiqa naqshbandhi that the results improved when you try to increase the bandwidth of the multiplexer…. And i want to ask Zakariya here that is there any logic on the basis of which you suggest that this variation depends on themodulation scheme used or the lenghth of the fiber ? Please provide the explanation (if any)…. Hope to hear from you

Thanks and regards

Sahil Singh

Hi Zakarya Saidi,

Indeed i guessed this correct that you concluded on the basis of simulations that you have conducted… Do you have some theoretical explanations ?

Regards

Sahil Singh

HELLO ZAKARYA,
For wdm mux we could have the following parameters values as:
Frequency 193.1
Frequency spacing 100
Bandwidth 100
Insertion loss 0
Depth 100
Filter type Gaussian
Filter order 2

While for WDM demux we should have following parameters values as:
Frequency 193.1
Frequency spacing 100
Bandwidth 100
Insertion loss 0
Depth 100
Filter type Gaussian
Filter order 4

Here i am attaching 8 channel CSRZ WDM SYSTEM.

Hello Ranjeet Kumar,

Thanks for such a valuable information… Your efforts are highly appreciated…

Regards

Sahil Singh

You are welcome Sahil Singh.
Thank you for your kind consent and appreciation

okk Sahil Singh, you are most welcome.
I will try to share the valuable information as per my ability.
nice to steal the appreciation and discussion which boost the confidence.

Hi Ranjeet Kumar,

You are indeed welcome and i hope you share your valuable knowledge to help the other members of the forum… Once again i appreciate you for your worthy efforts…

Regards

Sahil Singh

Hi,

Main parameters of Wdm system as :

Main parameters Standard Isolation High Isolation
Configuration 1×2, 2×2
Spectral bandwidth, nm (1295…1325nm/ 1528…1565nm)

Insertion loss, max, dB 0,3 0,7
Excess loss dependent on wavelength and temperature, max, dB 0,3 0,3
Isolation, min, dB 17 34
PDL, max, db 0,1 0,2
Directivity, min, dB 55 55
Optical power, max, mW 500 500
Operating temperature range, °C -10…+60 -10…+60
Fiber type SM Corning SMF-28 Corning SMF-28
Housing dimensions/fiber diameter, mm Ø3.0 x 55/ 0.25mm; Ø3.0 x 55/ 0.9mm; 6,4 x12 x 96/3mm

These are different parameters of WDM Mux.

Hi,
For wideband WDM system, we have:

wideband WDM based on fused type 1×2 splitter joint with isolator;
equipement allows two-directional optical transmission on one fiber in 1310 or 1550 band, with standard OLT in PDH and SDH systems (STM4 inclusive);
main parameters:
◦ bandwidth 1310±20nm or 1550±20nm;
◦ insertion loss (for one pair) < 8dB;
◦ channel isolation > 32dB;
◦ operating teperature range –5…+70°C.