1. E-Infrastructure for e-Science, CERIST-Algiers 15th 07 2010
Dynamics of Stimulated Brillouin Scattering in single mode optical fibers
Derradji BAHLOUL
Université Hadj Lakhdar de Batna
Laboratoire de Recherche Physique des Rayonnements et de leurs Interactions avec la Matière LRPRIM
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th
Université Hadj Lakhdar de Batna- Laboratoire LRPRIMA

2. Applications in industry
Metrology: Extreme coherence of Brillouin laser beam : Coherence of about  1Hz
Sensing: Using brillouin gain spectrum we get information onTemperature, stress.
Telecommunication : Prevent the optical signal coupled into the fiber to be backscattered, we need to avoid SBS.
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

3. Optical fibers as weveguides3
Optical wave guide having a cylindrical symmetry
Core   10 m
Cladding   125 m
Coatting   250 m 2 1
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

4. Confinement of the light wave
Internal total reflections
Cladding of fiber
Core of fiber
Laser beam
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

5. Refractive index modulation
Compression depression leading to spatio-temporal modulation of the density and of the refractive index of the of the medium
Sound velocity
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

6. Spontaneous Brillouin scattering
Spontaneous BS through Thermal acoustic waves.
Pump beam
Acoustic wave
Sound velocity
Brillouin scattered beam (Stokes wave)
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

7. Resonance condition
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

8. Brillouin Spectral Shift
Doppler-Fizeau shift because of the velocity of acoustic wave.
Pump spectrum
a.u
Brillouin Stokes
spectrum
Frequency
Frequency
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

9. Brillouin spectrum Lorentzian gain
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

10. Stimulated Brillouin Scattering
Pump Wave
Acoustic wave
Stokes Brillouin wave
Electrostriction
Interference
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

11. Brillouin lasers Gain/Active medium : fiber Resonator /Cavity: mirrors
Pumping: the pump beam
Brillouin scatted beam (Stokes wave)
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

12. Experimental Set up
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

13. Mathematical Model
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

14. Different dynamical regimes
Time
Beam
Power
Steady state Mirror regime.
Pulsed regime
Space
Beam
Power
Time
Beam
Power
Space
Beam
Power
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

15. Numerical simulation Steady state : Mirror regime
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

16. Numerical simulation Steady state : Mirror regime
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

17. Algorithm Put the initial condition
Solve the equations using a numerical method
Plot the results periodically
Store the data in a data file
Repeat the procedure in a for loop
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

18. Initial condition Pump: Brilouin wave: Acoustic wave:
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

19. Changing the referential frame
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

20. Time discretization
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

21. Standard 4th order Rauge Kutta
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

22. Summary of algorthim Initialize Ap, As, Q For n=1 to N
Solve Ap, As and Q with RK4
Save Ap, As and Q in a data file
Plot Ap, As and Q and save in a gif file
Repeat in a loop
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

23. Application porting on EUMED grid
Write a script file that encloses all the commands we need to execute on a computing element and the storage in a storage elements.
Write a JDL file that specifies the files to be sent and the files to be collected after executing the job.
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

24. Sending the job and getting the result
Submit the job with command:
Glite-proxy-submit <MyJDL_file>.jdl and get the reference link of thjob <RefrenceLink>
Check the stautus of the job using :
glite-proxy-submit <RefrenceLink>
When the job is terminated, get the output:
glite-proxy-ouput <RefrenceLink>
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

25. The Job to be submitted
#!/bin/sh # On the worker node you may have not # execution rights echo "setting right permissions" chmod 755 executable echo " runing right permissions “
executable >exe.out
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

26. The JDL file to submit the job
Type = "Job " ; JobType = "Normal " ; Executable = "script.sh" ; Arguments = “executable " ; StdOutput = "script.out " ; StdError = "script.err"; InputSandbox = {"script.sh"," executable }; OutputSandbox = {"script.out","script.err","exe.out","output.dat " }; ShallowRetryCount = 1;  
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

27. SBS Brillouin pulse
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

28. Pulsed Regime
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

29. Adding Metadata Adding Metadata 1)-Go to Eumed AMGA Catalogue Mdclient
2-Create AMGA directory in the file catalogue
>createdir /grid/eumed/Mydir
3- Add the metatadata about th directory
Addattr /grid/eumed/Mydir <name> <type>
4-Save the file in the storage element with a logical file name
lcg-cr --vo eumed -l lfn:/eumed/Mydir/Mydata.dat -d storm-01.roma3.infn.it file:///$PWD/outout.data
5- specify the metadata for each stored file
Addentry /eumed/Mydir/Mydata.dat <name> <type>
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

30. P Perspectives Parallel programming with MPI Parametric jobs
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th

31. Thanks
Université de Batna - Laboratoire LRPRIMA- EPIKH Workshop CERIST- Algiers 15th