[Jaffar Emad KadumParticipant]

Dear Aziz,

Note that the author was used this configuration to obtain Gaussian pulse so the setting used may be specific for this reason. I think the components used in the paper are available in optisystem.

Usually I don not change any parameter. But I use careful consideration of filters frequencies and layout parameters of optisystem they are very important .

I think The problem in your design is the frequency of lowpass filter. It should be (0.75*Bit rate) also try to check to frequency of bandpass filter to fit your requirement

[Jaffar Emad KadumParticipant]

Dear Aziz,

I see you are using different method from the paper, you used optical Gaussian pulse generator, but in the paper not !!

[Jaffar Emad KadumParticipant]

Dear Mr.Aziz

Here is my paper and I received your system. I will check it and respond as soon as possible.

[Jaffar Emad KadumParticipant]

Dear Aziz

Unfortunately now I do not have optisystem to check your system. I am sure there is a small error somewhere. you can attach the photo of optisystem design so I can comment on it. I have four papers about UWB signal generation from monocycle to fifth-order derivative Gaussain pulses operated with OOK and BPM modulation formats and all implemented in Optisystem.

It is incorrect to transmit Gaussian pulses for UWB communication. The UWB signal must be Gaussian monocycle or higher order derivative of Gaussian pulse for example Doublet or Triplet so that the power spectrum density will be comply with FCC mask..
This link is my latest paper published in British journal regarding the optical generation of Gaussian monocycle and doublet pulses with OOK and BPM modulation.

http://article.sapub.org/10.5923.j.optics.20150501.02.html

[Jaffar Emad KadumParticipant]

You can try signal processing component to remove the DC value of the power.

[Jaffar Emad KadumParticipant]

Try to make the laser power equals to zero. and then check the diagram.

[Jaffar Emad KadumParticipant]

Find also these waveforms of BPM and OOK modulation formats. You can notice the change in the phase of monocycle signal in BPM according to the input binary data.

[Jaffar Emad KadumParticipant]

Dear Aziz,

The two eye diagrams because you are working in ( BI-PHASE ) modulation format. The analyzer takes the complete cycle not only the positive or negative part of signal. BUT, these two diagrams one for ( 1 and 0) which are represented by a monocycle and its reflection

IF you work in ON-OFF keying modulation format you will get one eye diagram. as attached pic

[Jaffar Emad KadumParticipant]

Dear Bilal

As you know in the IR-UWB there is no carrier and the data is transmitted in very-short pulses (nanoseconds), thus Gaussian pulses are used because it easy to get narrow Gaussian pulses with sharp trailing and leading edges compared with square and triangle pulses. Now derivatives of Gaussian pulses are used (MONO, DOUBLET, TRIPLET..) for the following reasons:

1- The most important reason is to fit and comply with the mask specified by the FCC, as you note from the attached image, as the derivative order increase, the power spectrum of the transmitted UWB pulses fit the FCC mask and the power efficiency increased as well.

2- As you know the antenna is not efficient at DC and by using derivative the DC value is removed.

[Jaffar Emad KadumParticipant]

Dear Bilal,
I am currently working on the monocycle and doublet optical generation system based on Phase modulation to intensity modulation conversion, and I will give it to you after published

[Jaffar Emad KadumParticipant]

Alykom Alsalam

[Jaffar Emad KadumParticipant]

Dear Bilal,

I used this method in UWB-over-fiber system in my three papers
1- Transmission Performance Investigation of IR-UWB Signals over Existing optical fiber Transmission link
2- Transmission Performance Investigation of Multi IR-UWB Signals over DWDM Communication System
3- Integration of IR-UWB Services into Single- and Multi-Channel Optical
Coherent OFDM Network

in this journal
http://cirworld.com/journals/index.php/ijct/issue/view/374

[Jaffar Emad KadumParticipant]

Hi Bilal,

You can find my paper, I hope it can help you

http://cirworld.com/journals/index.php/ijct/issue/view/374

[Jaffar Emad KadumParticipant]

You can design OFDM system using MATLAB and then import the data into OPTISYTEM

[Jaffar Emad KadumParticipant]

Dear Fadi
I got the results above from this file which is built using OpitSystem 13.0. Check your simulation I dont know where is the error