Performance Enhancement of Ofdm Based Radio-over-fiber System-june

8/12/2019 Performance Enhancement of Ofdm Based Radio-over-fiber System-june

1/25

PERFORMANCE ENHANCEMENT OFOFDM BASED RADIO-OVER-FIBERSYSTEM

SREEDEVI.PGuided by CERD

Dr.N.Vijayakumar

1


2/25

Scheme: CERD

Date of joining: 25-08-2011

Date of Doctoral Committee: 18-08-2012

Registration Date:2-12-2012

Details of Course work Paper1: Research Methodology

Paper2: Optical Wireless Communication

Paper3: Advanced Optical Communication

Passed course work in the month of July2013

2


3/25

OVER VIEW

Review of last presentation

Activities as planned in last presentation

Current status

Publications

3


4/25

OVER VIEW OF LAST PRESENTATION

Designed and simulated all-optical OFDM for a 4-channel system using

Optical couplers

Optical frequency shifter

Explored the influence of optical amplifiers on all-optical OFDM.

4


5/25

PLANNED ACTIVITIES FOR THIS YEAR( AS PER LASTPRESENTATION)

5

Generation of OFDM using AWG and interferometer.

Bi-directional all-optical OFDM.

Hardware implementation.


6/25

WORK DONE FROM FEBRUARY-JUNE 14

Designed and simulated all-optical OFDM using 3dB couplers(extendedversion of previous work).

Designed 4-channel system for different data rates 40Gbps and100Gbps.

The signal power of the source, extinction ratio of optical modulator,dispersion parameter and responsivity of the detector were optimisedto achieve a min SNR of 20dB and min BER of 10-9.

Extended the same system for 8-channel all-optical OFDM usingfourier, hartley and cosine transforms.

Generated all-optical OFDM using AWG.

Designed and simulated unidirectional and bi-directional 8-channelsystem .

6


7/25

BLOCK DIAGRAM OF OPTIMISED 4-CHANNEL ALL-OPTICAL OFDM

7


8/25

PERFORMANCE GRAPH OF OPTIMISED 4-CHANNEL SYSTEM

8


9/25

COMPLEX ALL-OPTICAL OFDM(8-CHANNEL)

9


10/25

REAL ALL-OPTICAL OFDM (HARTLEY)

10


11/25

REAL ALL-OPTICAL OFDM(COSINE TRANSFORM)

11


12/25

DETECTED SPECTRUMS

12


13/25

COMPARISON OF THE 8-CHANNEL OPTIMISED SYSTEM

The complex all-optical OFDM achieved a minimum BER of 10 -12 to 10 -7

from 10 to 100km.

The real all-optical OFDM using Hartley Transform achieved a minimumBER of 10-10to 10-7for the same distance

The real all-optical OFDM using Cosine Transform achieved a minimum

BER of 10-9

to 10-7

for the same distance.

13


14/25

OFDM USING ARRAY WAVEGUIDE GRATING

14


15/25

8-CHANNEL AWG OFDM

15


16/25

CONTD..

16


17/25

TRANSMITTED SPECTRUM

17


18/25

DETECTED SPECTRUM OF TWO CHANNELS

18


19/25

CONTD..

The system achieved a min BER of 10-9for 20km.

19


20/25

PLANNED ACTIVITIES

100Gbps bi-directional all-optical OFDM using AWG ,interferometersand couplers.

Comparison of all-optical OFDM generation techniques with itselectronic counterpart.

20


21/25

CONFERENCE

Influence of Optical Amplifier Parameters on a photonic OFDM basedRadio-over-Fiber system, accepted for international conference oncommunication and signal processing,2014

21


22/25

JOURNAL(SUBMITTED FOR REVIEW)

Novel Method for generation of all-optical OFDM for RoF

Applications-Submitted to IEEE photonics Technology Letters

22


23/25

REFERENCES

[1]. H.C.Bao and W.Shieh, Transmission of wavelength-division-multiplexed channels with coherent optical OFDM,IEEE

Photon.Tech.Letter.19,922-924(2007).

[2]. B.J.Schmidt,A.J,Lowery and J.Armstrong, Experimentaldemonstrations of 20Gbps/direct detection optical OFDM and 12Gbps with

a colorless transmitter,NFOEC2007.[3]. A.J.Lowrey, L.B.Du and J.Armstrong, Performance of optical OFDM inultralong-haul WDM light wave systems, J.Lightwave Tech.25,131-138(2007).

[4]. A.J.Lowrey, Fiber nonlinearity pre and post compensation for long hauloptical links using OFDM, Opt.Exp.15,12966-12970(2006).

[5]. A.J.Lowrey, Fiber nonlinearity in optical links that use OFDM fordispersion compensation,IEEE Photon.Tech.Lett.19,1556-1558(2007).

23


24/25

[6]. W.Sheih, R.S.Tucker,W.Chen,X.Yi and G.Pendock, Optical

performance monitoring in coherent optical OFDM,Opt.Exp.15,350-356(2007).

[7]. W.Sheih,W.Chen and R.S.Tucker, Polarization mode dispersion

mitigation in coherent optical orthogonal frequency division multiplexedsystems,Electron.Lette.42,996-997(2006).[8]. I.B.Djordjevic, PMD compensation in fiber-optic communicationsystems with direct detection, Opt.Exp.15.3692-3701(2007).

[9]. Kyusang Lee,Chan T.D Thai and June-Koo Kevin Rhee All opticaldiscrete Fourier transform processor for 100Gbps OFDM transmission,

Optics Express,Vol.16,No.6,pp.4023-4028,2008.

24


25/25

Thank you

25

Documents

Performance Enhancement of Ofdm Based Radio-over-fiber System-june