Search Results for 'wdm'

[alistuParticipant]

I wanted to ask whether this is the system you had formerly asked for suggestions for performance improvement. I once used DCF and once reduced the WDM laser linewidth to 0.1 MHz, which is acceptable for low power CW lasers, but neither of these methods made a remarkable change in the Q-factor. However, I suggest that you go with laser linewidth reduction and see if that helps.

[lavanya krishnanParticipant]

hi alitsu,
but if I use “max q factor” in a 16 channel wdm(I have attached it below) system I get maximum q factor of 4.9 but if in case of “penalty:Q factor from Min.BER at user defined decision instant(dB)” I get maximum q factor of 33 .what can I use to define the quality of transmission

[Dr. Dhiman KakatiParticipant]

Dear Shify, I am also designing RoF system where WDM interleaver demux i am using and all are working fine. I can find only one interleaver in optisystem 13, that is WDM interleaver demux.

With Regards

[alistuParticipant]

Hi Shify,

An optical interleaver simply considers the DWDM channels as odd and even channels and then combines them into one signal stream. I have attached an image clearly showing what it does.

The “WDM interleaver MUX” component in OptiSystem library is the same as an optical interleaver, and “WDM interleaver Demux” is the same as an optical de-interleaver. You can refer to my following answer:

interleaver and WDM interleaver

Regards

[Dr. Dhiman KakatiParticipant]

Dear Sify, a WDM interleaver is used to separate the different wavelength components in a signal. It is basically used in case where wavelength division multiplexing (WDM) is done, Suppose we are designing a WDM system which contain 1510 nm and 1550 nm signal which are multiplexed and transmitted through the same fiber. the 1*2 WDM interleaver can be used to separate the two wavelengths. Here we have to set the Center frequency of the first filter and then Frequency spacing between adjacent filters (let 100 GHz) then 3-dB filter bandwidth and other parameters in the component properties accordingly as required, It is most useful in DWDM systems where the frequency spacing is less such as 50GhHz.

Thanks

[Shify MathewParticipant]

can i use wdm interlever demux instead of interleaver in rof system….and what is the working of this component

[Alabbas Ahmed Abduljabbar]

Hi All,

I’d like to ask you the simulation design of ofdm-wdm-pon.
i attached this file but the result of BER and constellation is very ideal !!

do you have another design to simulate, pls attach it

thanx

[mohammed hosni]

dear sir
i have problem
my master degree depend on simulation polymer fiber using optisystem and i have not polymer fiber component
so i have used parabolic multimode component and make the attenuation and dispersion and dispersion slope in Script mode as i make component Script . the project is CWDM with 2 optical sources . and we knoe that Attenuation And dispesion depend on the optical source wavelength
my quesion is how can i make the Attenuation and dispersion work with the these two freuency??
here is the parabolic component script :
FileName = “C:\Users\oe\Desktop\index_700.txt”
Dim FileSystemObject
Dim ThisComponent_array(2,3)
Dim ip_array(2)
Dim OutF
Set FileSystemObject = CreateObject(“Scripting.FileSystemObject”)
Set OutF = FileSystemObject.CreateTextFile(FileName, True)
Dim ThisComponent
Set ThisComponent = GetThisComponent()
Dim par
Set par = Document.GetComponentParameter( “”,”CW Laser”,”Frequency”)
Set par_1 = Document.GetComponentParameter( “”,”CW Laser_1″,”Frequency”)
parval = Document.GetComponentParameterValue( “”,1, “CW Laser”,”Frequency”)
parval_1 = Document.GetComponentParameterValue( “”,1, “CW Laser_1″,”Frequency”)
ip_array(0)=parval
ip_array(1)=parval_1
TextLine = “”
TextLine = TextLine+”the frequancy of the first source =”+ CStr( ip_array(0) ) + ” ”
OutF.WriteLine( TextLine )
TextLine = “”
TextLine = TextLine+”the frequancy of the second source =”+ CStr( ip_array(1) ) + ” ”
OutF.WriteLine( TextLine )
ParameterName1=”Dispersion”
ParameterName2=”Attenuation”
ParameterName3=”Dispersion slope”
‘dispersion Slope
for i=0 to 1ParameterValue2=1.15*10^(-5)*(8000/ip_array(i))+13*(633/ip_array(i))^(4)
ThisComponent.SetParameterValue ParameterName2, ParameterValue2*1.0
‘define parameters
T0=300’Romm temperature in K
T=300’Romm temperature in K
C=3*10^(5)’Speed of light in space
‘define sellemier Parameters for cytop
s1=0.6749
s2=0.9472*(T/T0)
s3=0.4383
s4=0.9764*(T/T0)
s5=0.1596
s6=12.56 *(T/T0)
‘define sellemier equation
n1=(1+((s1*ip_array(i)^(2))/(ip_array(i)^(2)-s2^(2)))+((s3*ip_array(i)^(2))/(ip_array(i)^(2)-s4^(2)))+((s5*ip_array(i)^(2))/(ip_array(i)^(2)-s6^(2))))^(0.5)
dn1dX=-1*(ip_array(i)/n1)*((s1*s2^(2))/((ip_array(i)^(2)-s2^(2))^(2))+(s3*s4^(2))/((ip_array(i)^(2)-s4^(2))^(2))+(s5*s6^(2))/((ip_array(i)^(2)-s6^(2))^(2)))’%Ist derivitive of n w.r.t X
‘2nd derivitive of n1
dn2dX=1*(1/n1)*((((s1*s2^(2))*(3*ip_array(i)^(2)+s2^(2)))/((ip_array(i)^(2)-s2^(2))^(3))+((s3*s4^(2))*(3*ip_array(i)^(2)+s4^(2)))/((ip_array(i)^(2)-s4^(2))^(3))+((s5*s6^(2))*(3*ip_array(i)^(2)+s6^(2)))/((ip_array(i)^(2)-s6^(2))^(3)))-(dn1dX)^(2))
dn3dX=dn1dX*((3*ip_array(i)*dn1dX)/(n1*(ip_array(i)^(2)-s2^(2)))+((dn1dX)^(2)/n1^(2))-(6/(ip_array(i)^(2)-s2^(2)))+(6*(3*ip_array(i)^(2)+s2^(2))/(ip_array(i)^(2)-s2^(2))^(2))-((2*dn2dX)/n1))
ParameterValue1=((-1*ip_array(i)*dn2dX)/C)*10^(12)
ThisComponent.SetParameterValue ParameterName1, ParameterValue1 *1.0
ParameterValue3=(-1*(dn2dX+(ip_array(i)*dn3dX))/C)*10^(12)’dispersion Slope
ThisComponent.SetParameterValue ParameterName3, ParameterValue3*1.0
ParameterValue3=((1.58*(10^(-12)))*exp((1.15*10^(4))/ip_array(i))+(13*(633/ip_array(i))^(4)))
ThisComponent.SetParameterValue ParameterName2, ParameterValue2*1.0
TextLine = “”
TextLine = TextLine+”When the Frequency =”+ CStr( ip_array(i) ) + ” ”
TextLine = TextLine+”Then the resulted Dispersion =”+ CStr( ParameterValue1 )+ ” ”
TextLine = TextLine+”,and The Dispersion slope =”+ CStr( ParameterValue3 )+ ” ”
OutF.WriteLine( TextLine )
ThisComponent_array(i,0)=ip_array(i)
ThisComponent_array(i,1)=ParameterValue1
ThisComponent_array(i,2)=ParameterValue3
Next
OutF.Close
the attached file is project

[lavanya krishnan]

I design a 16 channel 10Gbps wdm system.in that design when I plot a curve between span-length and q-factor I got maximum q-factor 3.3
which far less than acceptable level. normally a system has a q-factor of 6-9 .can anyone help me to increase q factor?

[gaganpreet Kaur]

i am designing a DP-QPSK WDM system with 4 channels. but i am unable to find the eye openings or get BER. in the sampl examples the given design usues only one DP-QPSK transmitter and output is measured using BER tester i dont know how to use it, whats its meaning and how to interpret results on it. kindly help me. we have purchased optisystem 13.0 recently and i am new to it . so find it difficult .

[gaganpreet Kaur]

Hello everyone , in my WDM design i am getting OSNR values as high as 95 dB or more at output . even the ouput of optical spectrum analzyer shows Noise in different band from signal which is possibly whz OSNR is high. but is it feasible ? if no then whz such high OSNR values exist at output even before amplification OSNR is near 66 dB at input.
pls if anzbdz could suggest me something

[alistuParticipant]

Hi Lavanya,

Generally, Q- factor is dependent on the factors that make the system performance better. This includes reducing dispersion which might lead to ISI, nonlinear effects that may appear in a WDM system as four-wave mixing and/or cross-phase modulation, and noise of any kind.

Regards

[lavanya krishnan]

IN A wdm system what can I do to increase q-factor what are the parameters on which q-factor depends

[Swapandeep KaurParticipant]

sir please explain in simple language which of the edfa- wdm system gives a better performance? which should we choose and why? do you mean to say that it depends on choice of dwdm , cwdm systems?

[Ahmad MahmoodParticipant]

Respected Sir,
The circuit you provided is working very fine but the output of the WDM DeMux is not as the Wave is at the output of the modulator. Please Help in this regard. Thanks in anticipation.