Coherent optical ofdm

[jyotika aggarwal]

Sir please help me i want to sinulate the paper attached below.But i don’t know how to use 5 port OFDM modulator.where to connect the fifth port of OFDM modulator.please reply soon.

Attachments:

1. newww.pdf

[Aabid Baba]

Hello Jyotika Aggarwal,
As far as your query is concerned I am attaching a link of a tutorial which may be helpful to you in your system design
You may refer to it.

Coherent Optical OFDM

Regards

[Karan Ahuja]

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 domainsuch as digital audio broadcasting (DAB), digital video broadcasting (DVB), and Wireless Local Area Networking (WLAN). OFDM was introduced tooptical 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 wouls help.
Regards

[Karan Ahuja]

Hello
I would like to mention that Orthogonal Frequency Division Multiplexing (OFDM) is a Multi Carrier Modulation (MCM) technique which uses many subcarriers to carry the information. The main advantage of the OFDM is its ability to overcome channel dispersion. Also, 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). Moreover the system is resistant to inter-symbol interference (ISI) because of the cyclic prefix code.
I hope this will be helpful.
For your convenience i am attaching link of one paper which may be useful to you.
http://www.ijera.com/papers/Vol5_issue2/Part%20-%202/A502020104.pdf
regards

[Karan Ahuja]

Here is link of one paper that may help you you may refer to it.
http://ieeexplore.ieee.org/xpl/articleDetails.jsparnumber=6334404&newsearch=true&queryText=Constant%20Envelop%20MinimumShift%20Keying%20OFDM%20Coherent%20Optical%20Communication%20System
In this paper, we propose a constant envelop minimum-shift keying orthogonal frequency division multiplexing (CE-MSK-OFDM) modulation scheme. This scheme can mitigate the inherent drawbacks of CE quadrature phase shift keying OFDM (CE-QPSK-OFDM) and MSK-OFDM. Advantages of the proposed CE-MSK-OFDM modulation scheme are theoretically investigated. A CE-MSK-OFDM coherent optical experimental system is presented. In our experiment, 2.5 Gb/s CE-MSK-OFDM signal and 2.5 Gb/s CE-QPSK-OFDM signal are transmitted over a 100 km standard single mode fiber (SSMF) without phase compensation to check its advantages in mitigating intercarrier interference (ICI). In addition, performance under large fiber launch power is also measured to check its advantages in counteracting fiber nonlinear impairments. The experimental results show that the proposed system performs well in decreasing ICI and peak-to-average power ratio (PAPR) as the theoretical analysis reveals.

Thanks

[Aabid Baba]

Hi Karan Ahuja,
Thank you for sharing some valuable information. I hope this immensely helps Jyotika . The papers you have provided seem to be appropriate as per her requirements. Thanking you
Regards

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