[Hamza Ali Abbas KhanParticipant]

I agree with Mr.Aabid Baba.
It is very much related to the factors aforementioned by Aabid Baba.Hope it in a way helps you.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

sorry for the duplicate comment.
I apologise.

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[Hamza Ali Abbas KhanParticipant]

Hello.

As mentioned by other forum members that we can design optical sensors in Optisystem making the use of fiber bragg grating. I would suggest you to refer to the link provided by Aabid Baba.
FBG sensors, which is one of the most commonly used and broadly deployed optical sensors,which reflects a wavelength of light that shifts in response to variations in temperature and/or strain. FBGs are constructed by using holographic interference or a phase mask to expose a short length of photosensitive fiber to a periodic distribution of light intensity. The refractive index of the fiber is permanently altered according to the intensity of light it is exposed to. The resulting periodic variation in the refractive index is called a fiber Bragg grating. When a broad-spectrum light beam is sent to an FBG, reflections from eachWhenent of alternating refractive index interfere constructively only for a specificalternatingof light called the Bragg wavelength.It nicely & briefly explained how we can make use of gratings to ensure design of an optical sensor.

Sensors

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[Hamza Ali Abbas KhanParticipant]

Hello.

I agree with all the forum members that there are few factors that may be responsible for large running time. I agree with Aabid baba Burhan and Karan Ahuja. The reasons for high simulation time can be high transmission power or high launching power. The factor aforementioned can be large sequence length which may also make simulation time very high. I agree with Burhan also that complex design also makes the running time high. I would suggest you to take care of these factors and may be that will be helpful.
Hope this is helpful.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi all.

Nice points put forth by all forum members. I agree with all. This has been a issue lately. One needs to switch to 64 bit operating system PCs to install any optiwave tool since 32 bit softwares have been removed from the website aforementioned by other forum members. It will a great effort from optiwave team if they keep both the versions 32 bit as well as 64 bit. That way no one will need to switch to other PC configurations. Hope this is done.

Thanks
regards

[Hamza Ali Abbas KhanParticipant]

Hi.
I agree with what Mr Aabid baba has mentioned in his reply. This may be possibly a big as rightly mentioned by Aabid. I too would suggest you to first uninstall the tool and then again install it. I hope this will work for you and you won’t face this problem again.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi.
Rightly put by Mr.Aabid Baba. I agree that the new versions of optiwave products are only available for 64 bit operating systems. No latest version is available for 32 bit version. I would suggest you to look for older version if at all available with anyone. Rest you may contact optiwave support team as mentioned by Mr.Aabid.
Hope this is helpful to you.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi.
As mentioned by Mr Aabid there must be no limit but this will cause undue increase in this time for simulation.
Hope this is helpful.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi
Your problem with the eye diagram could be exactly because of what Mr Burhan has mentioned i.e increases bandwidth of the mux or demux or any other filter you are using in your system design. Such thing can lead to this unusual eye diagram.
Also the relation you are asking about the bandwidth and BER has been rightly mentioned by Mr Aabid. I hope this will help you.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi.

I would suggest you to look for the optisystem sample files. You can find the example “OFDM Modulator” in those sample folders. There is also another sample named “OFDM demodulator” that has the exact same implementation.
And as fas as theoretical aspect of the implementation is concerned i agree with karan ahuja that OFDM has the ability to transmit information with high data rates which has made it popular. OFDM has been used in many different applications in the RF domain
such as digital audio broadcasting (DAB), digital video broadcasting (DVB), and Wireless Local Area Networking (WLAN). OFDM was introduced to
optical domain in 2005, and has since been studied and investigated in two main techniques classified according to the detection scheme. The first technique is the direct detection optical OFDM (DDOFDM) and the second technique is the coherent optical OFDM (CO-OFDM). A direct detection optical OFDM aims for simpler transmitter or receiver than CO-OFDM for lower costs. DD-OFDM has an advantage that it is more immune to impulse clipping noise. Coherent Optical OFDM (COOFDM) is the next generation technology for optical communications since it integrates the advantages of both coherent systems and OFDM systems. COOFDM provides linear detection and high spectral efficiency. The CO-OFDM system has the ability to overcome many optical fiber restrictions such as Chromatic Dispersion (CD) and Polarization Mode Dispersion (PMD).

I hope this would help.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi
As i can already see that your problem has been solved. It could have been only the manual calculation as presumed. Anyway good work.Keep it up.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

For details you may refer to this link.It will surely help.

Lesson 4: Parameter Sweeps — BER x Input Power

I hope it does help.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hello Nabilah.
As you want to plot graph between Ber and gain but I may give you a general procedure. To create a graph showing the BER versus the power, you must obtain the results generated by the BER Analyzer . To obtain results using the Report Page , perform the following procedure.

1.Select the Report tab in the Project layout window.The Report window appears.
2. Click the Opti2DGraph button on the Report toolbar and draw a 2D graph in the report window.The 2D graph appears in the Report window.
3. In the Project Browser, select the parameterPower from the CW Laser , and drag it to the 2D graph X-axis (a grey triangle appears in the graph in the bottom right corner).The graph appears in the Report window.
4. In the Project Browser, select the Min. log of BER result from the BER Analyzer component, and drag it into the Y-axis of the graph (the grey triangle appears in the top left corner).
The result is plotted in the graph.
hope this will help in your case.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi.
As already mentioned by Mr.Aabid that this has been already discussed on the forum before, I want to add that It has been rightly mentioned that in OptiSystem a signal is generally expressed as a sampled signal, which is passed to a component in one chunk. To perform time domain calculations, like feedback, the sampled signal must be converted to individual samples, which consist only of a single signal value and its corresponding position in time. This allows OptiSystem to propagate the samples through different components at different times. The attached project file Electric_Phase_Locked_Loop.osd is an example of an electrical feedback system.
You can follow the tutorial on this example at:

Electrical PLL

I hope this will be helpful to you.
Thanks
Regards

[Hamza Ali Abbas KhanParticipant]

Hi All.

Can we use FBG for four wave mixing here?
Thanks
Regards