f the SMF is 70 km long and DCF 10 km, calculate the required total dispersion f the DCF f the cut-off wavelength of the DCF is 900 nm and has a step index refractive ndex profile and laser diode has a spectral width of 1 nm, calculate the core efractive index and core radius of the DCF. Bear in mind that the material ispersion of the fiber at 1550 nm is still 17 ps/nm-km. The cladding refractive ndex is 1.457 The SMF has a spot size of 4 µm at 1300 nm and cut-off wavelength 1200 nm. Calculate the joint loss between the two fibers in dB at 1550 nm

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A conventional 1300 nm optical fiber communication system is to be upgraded to operate at
1500 nm. However, the conventional single mode fiber (SMF) has large total dispersion of 17
ps/nm-km at 1550 nm. To eliminate this large dispersion, it is proposed to employ the
dispersion-compensation technique by connecting a length of dispersion compensating fiber
(DCF) with appropriate dispersion.
(i)
(ii)
(iii)
If the SMF is 70 km long and DCF 10 km, calculate the required total dispersion
of the DCF
If the cut-off wavelength of the DCF is 900 nm and has a step index refractive
index profile and laser diode has a spectral width of 1 nm, calculate the core
refractive index and core radius of the DCF. Bear in mind that the material
dispersion of the fiber at 1550 nm is still 17 ps/nm-km. The cladding refractive
index is 1.457
The SMF has a spot size of 4 um at 1300 nm and cut-off wavelength 1200 nm.
Calculate the joint loss between the two fibers in dB at 1550 nm
Transcribed Image Text:A conventional 1300 nm optical fiber communication system is to be upgraded to operate at 1500 nm. However, the conventional single mode fiber (SMF) has large total dispersion of 17 ps/nm-km at 1550 nm. To eliminate this large dispersion, it is proposed to employ the dispersion-compensation technique by connecting a length of dispersion compensating fiber (DCF) with appropriate dispersion. (i) (ii) (iii) If the SMF is 70 km long and DCF 10 km, calculate the required total dispersion of the DCF If the cut-off wavelength of the DCF is 900 nm and has a step index refractive index profile and laser diode has a spectral width of 1 nm, calculate the core refractive index and core radius of the DCF. Bear in mind that the material dispersion of the fiber at 1550 nm is still 17 ps/nm-km. The cladding refractive index is 1.457 The SMF has a spot size of 4 um at 1300 nm and cut-off wavelength 1200 nm. Calculate the joint loss between the two fibers in dB at 1550 nm
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