Search Results for 'DPSK'

[manish Kumar]

hi,i am mtech student and i am new user of optisystem. my query is how to generate downstream DPSK signal by using DFB laser and phase modulator(PM)?

[muhammad jawad]

Dear friends

I am working on optisys 7.I want to generate DPSK signal.Apparently there is no DPSK signal generator in 7 version.Can anybody tell me how to generate it for using it on ROF link?Any alternative if not in 7 version?
regards

[Dwiki Kurnia]

Could anyone explain me about the components that used on NRZ-DPSK & NRZ-DQPSK format modulation on Optisystem? Thank you

[jagan padhy]

hello everybody,wishing u all a very happy and prosperous new year.Can anybody help me on the topic that what is the max range in free space optics has invented in recent research,i have designed a system using dpsk modulation which support max of 7000 mt.
is it correct or wrong i m confused.please hepl me

[muhammad asif]

this is the simulation of dpsk which i have implemented using dpsk modulation .the data i have sended is through fso, but i am not getting the results . kindly point out the query and explain it.

Attachments:

1. DPSK2.osd

[muhammad asif]

Digital Modulation – DPSK

this is the model of dpsk on optiwave site, eye diagram is correct but the ber in eyediagram is 1 . which shows the system is not correct .kindly explain

[Karan AhujaSpectator]

I want to add that A dual-drive LiNbO(3) architecture modulator with chirp management is proposed and developed offering SFDR > 25 dB in a 1.4 V bias excursion compared to only 0.5 V bias excursion in a conventional Mach-Zehnder electro-optical modulator (MZ-EOM). The architecture effectively extends the linear regime and enables the optical transmission of wireless systems employing orthogonal division multiplexing (OFDM) modulation such as ultra-wide band (UWB) which require high linearity over a broad frequency range due to their high peak-to-average power ratio (PARP). Radio-over-fiber UWB transmission in a passive optical network is experimentally demonstrated employing this technique, exhibiting an enhancement of 2.2 dB in EVM after 57 km SSMF when the dual-drive developed modulator is employed. Depending on your application you can choose between three transmitters: NRZ or NRZ, RZ and CS-RZ or a transmitter that supports six modulation formats: NRZ, RZ and CS-RZ and the three corresponding DPSK versions. As receivers we offer a photo receiver for NRZ, RZ and CS-RZ as well as a receiver for DPSK with built in decoder and a balanced detector. You may refer to this link.

http://www.ncbi.nlm.nih.gov/pubmed/22274055

Thanks

[Fady]

Could anyone please explain the sample file NRZ-DPSK.osd in the sub folder PSK systems in the folder advanced modulation systems.Thank you

[Hamza Ali Abbas KhanParticipant]

Hello.
As far as your query is concerned it has been rightly mentioned by Mr Rajguru that you use advanced modulation formats like CSRZ, DRZ and MDRZ and DPSk because these supports both long haul transmission and high data rate.
You may go through these.
http://www.inase.org/library/2014/interlaken/bypaper/COSICO/COSICO-30.pdf
http://www.ijettjournal.org/volume-17/number-10/IJETT-V17P292.pdf
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5689024&abstractAccess=no&userType=inst
http://www.inase.org/library/2014/interlaken/bypaper/COSICO/COSICO-30.pdf
http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D6210761%26userType%3Dinst&denyReason=-133&arnu

I hope this will help.
Thanks
Regards

[Abhilash AchantaParticipant]

I have even observed in the tutorials section for QAM and DPSK.
The min BER is 1 which means there are 100 % errors in received bits?

Attachments:

1. 

   DPSK_eye_dia.png
   

2. 

   QAM_eye_dia.png
   

[Guddan Kumari]

hello everyone

i am working on 8-psk modulation technique. but i am not getting how to set threshold detector input and output threshold to get the output. as i am setting the similar values as given in your dpsk modulation and demodulation tutorial, i am not getting the result of ber analyser. please help me out

thanking you

with regards
guddan kumari

[Zulia Nurul Karimah]

Hi guys, I would like to ask you some questions.
Here I use modulation formats of CSRZ, NRZ, RZ, RZDPSK and RZDQPSK in each systems based on https://optiwave.com/resources/applications-resources/optical-system-advanced-modulation-formats/
The questions are:
1. I put OTDV after the last MZM to see how the signal are modulated in every format. But I’ve been confused why with CSRZ there’s no transition in every bit.
2. Why in NRZ and RZ there’s a delay for 1 bits in the beginning of transmit signal. Fyi, the information bit that I used is 1011.
3. Can you explain me how RZDPSK and RZDQPSK modulated the signal like that?
4. The comparison between receive signal in every format modulation?

Thank you, hope to see the answers soon 🙂

Another parameter that I used:
-18 channel 1271 to 1611 nm
-CWDM
-FTTH
-Bitrate: 2,5 Gbps
-Power transmit: 7 dBm
-Liniar&nonlinear effects

Attachments:

1. 

   Untitled-1.jpg
   

[Karan AhujaSpectator]

Hello,
I would like to add that using an encoding/decoding (E/D) technique and optical thresholding multiple access interference (MAI) can be eliminated effectively. In on-off keying (OOK) OCDMA, the interference level is studied to be more and also requires high power level to maintain the desired BER for the given number of users with direct detection. Even after employing the optimum fixed decision threshold or adoptively varying the decision threshold with the number of users, the performance of the 8 asynchronous OOK OCDMA system does not meet performance level of differential phase shift keying (DPSK) OCDMA. Optical thresholding in OOK OCDMA can eliminate MAI to the extent as that of DPSK encoder/decoder in the system without sacrificing the BER and OSNR required for proper operation of the receiver.

Regards

[Hamza Ali Abbas KhanParticipant]

You may refer to these links

Digital Modulation – DPSK

Advanced Modulation Formats

[gulkaran bajwa]

Hello friends,
I would like to know about electrical CPFSK modulator component in Optisystem in which there are two ports one is for binary input another one generates electrical output. i just wanna know that CPFSK is a modulation format like NRZ or RZ If yes then can i generate a signal like PBRS connected with CPFSK and then modulate with CW laser via MZM.
In some papers of Radio over Fiber they used directly as i mentioned but some paper uses like 10 gbps NRZ data is modulated with DPSK or what ever modulation they are using. I am confused because electrical CPFSK or DPSK cannot take electrical input if we generate data with NRZ and then modulate. Please help me out is CPFSK, DPSK etc are modulation formats like NRZ or RZ…….