1. Optical Communication et4-013 B1 Optical Communication Systems Opto-Electronic Devices Group Delft University of Technology Opto-Electronic Devices Group Delft University of Technology Meint Smit Xaveer Leijtens Siang Oei Meint Smit Xaveer Leijtens Siang Oei Course et4-013

2. Optical Communication et4-013 B2 Contents  Introduction  Fibre transmission properties  Light sources (laser, LED)  Light detectors  Optical receivers  Fibre systems  Introduction  Fibre transmission properties  Light sources (laser, LED)  Light detectors  Optical receivers  Fibre systems

3. Optical Communication et4-013 B3 Fibre performance z=0z=L Dispersion z=0z=L Attenuation

4. Optical Communication et4-013 B4 Fibre attenuation (SiO 2 ) 1.80.81.01.21.41.60.91.11.31.51.7 Wavelength (  m) Attenuation (dB/km) 0.2 0.5 1.0 1.5 0.16 dB/km Rayleigh scattering IR band edge OH - -peak UV absorption

5. Optical Communication et4-013 B5 Bandwidth and Bit rate t TT FWHM dBo 0 -1.5 -3 fofo fefe dBe 0 -3 -6 I det = R·P opt (:)  P el Rule-of-thumb:  

6. Optical Communication et4-013 B6 Types of dispersion  Intermodal dispersiononly for MMF  Material DispersionChromatic  Waveguide DispersionDispersion  Polarisation Mode Dispersion (PMD)  Intermodal dispersiononly for MMF  Material DispersionChromatic  Waveguide DispersionDispersion  Polarisation Mode Dispersion (PMD) } {

7. Optical Communication et4-013 B7 z=0 Chromatic dispersion TT z=L

8. Optical Communication et4-013 B8 Phase velocity (mode) z

9. Optical Communication et4-013 B9 Group velocity (pulse) z

10. Optical Communication et4-013 B10 Material Dispersion (1)

11. Optical Communication et4-013 B11 Material Dispersion (2)

12. Optical Communication et4-013 B12 Material Dispersion (3) Material Dispersion SiO 2 1.27

13. Optical Communication et4-013 B13 Standard Single-Mode Fibre

14. Optical Communication et4-013 B14 Fiber classification (1) Core diameter50 - 400  m Cladding125 (500)  m 2 nd coating250 - 1000  m NA0.16 - 0.5 Attenuation1 - 4 dB/km BL-product6 - 25 MHz.km ApplicationShort distance, low cost limited bandwidth Core diameter50 - 400  m Cladding125 (500)  m 2 nd coating250 - 1000  m NA0.16 - 0.5 Attenuation1 - 4 dB/km BL-product6 - 25 MHz.km ApplicationShort distance, low cost limited bandwidth MM-SI: Multi Mode - Step Index fiber

15. Optical Communication et4-013 B15 Fiber classification (2) Core diameter50  m standard Cladding125  m 2 nd coating200-1000  m NA0.2 - 0.3 Attenuation1 dB/km (1300 nm) BL-product 150 MHz.km - 2 GHz.km ApplicationMedium distance communication LED/Laser sources Core diameter50  m standard Cladding125  m 2 nd coating200-1000  m NA0.2 - 0.3 Attenuation1 dB/km (1300 nm) BL-product 150 MHz.km - 2 GHz.km ApplicationMedium distance communication LED/Laser sources MM-GI: Multi Mode - Graded Index fiber

16. Optical Communication et4-013 B16 Fiber classification (3) Core diameter3-10  m Cladding50-125  m 2 nd coating200-1000  m NA~0.1 (not used) Attenuation0.20@1550 - 0.4@1300 dB/km BL-product >> 500 MHz.km ApplicationLong distance communication Lasers, standard fiber Core diameter3-10  m Cladding50-125  m 2 nd coating200-1000  m NA~0.1 (not used) Attenuation0.20@1550 - 0.4@1300 dB/km BL-product >> 500 MHz.km ApplicationLong distance communication Lasers, standard fiber SM-SI: Single Mode - Step Index fiber

17. Optical Communication et4-013 B17 Waveguide dispersion n 1 ( ) n 2 ( )

18. Optical Communication et4-013 B18 Dispersion shifted fibre

19. Optical Communication et4-013 B19 Dispersion Mechanisms Intermodal multimode fiber! Intramodal / Chromatic material n waveguide

20. Optical Communication et4-013 B20 Optimal Pulse Width Gaussian pulse:

21. Optical Communication et4-013 B21 Soliton Transmission t    E tot =2   T FWHM=1.76T n(E)n(E) Pulse Compression

22. Optical Communication et4-013 B22 Erbium-Doped Fiber Amplifier (EDFA) PUMP LASER 0.98  m or 1.48  m Er-doped fiber MUXFILTER