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A step-index multimode glass fibre, with a core diameter of 50 um and cladding refractive index of 1.45, is designed to...
A step index fibre has a numerical aperture of 0.16, a core refractive index of 1.45...
A step index fibre has a numerical aperture of 0.16, a core refractive index of 1.45 and a core diameter of 90 mm. Calculate: 1. The refractive index of the cladding. 2. The acceptance angle θm and the confinement angle θ 0 m. 3. The approximate number of modes with a wavelength λ = 0.9 µm that the fibre can carry.
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1....
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1.55 um 2, A 1.55 μm digital communications system operating at 4 GBits/s receives an average power of -24 dBm at the detector. On the assumption that 1 and 0 bits are equally likely to occur how many photons are received within each 1 bit? 3. A1.3 um digital communications system operating at 3 GBits/s receives an average power of -29 dBm at...
1. A fiber has a core with a refractive index of 1.53 and a cladding with...
1. A fiber has a core with a refractive index of 1.53 and a cladding with an index of 1.459. What is the numerical aperture? 2. A fiber has a core with refractive index of 1.5 and a cladding with an index of 1.465. Determine what the confinement angle is? 3. A laser source has 4.5 mW coupled into a fiber. Calculate the loss in dB if the power output is only 2.3 mW. 4. Schott brand BaK4 glass has...
Attenuation in dB km-1 (e 01 0.5 005 0 I 1.2 Wavelength (um) 90 9 1 The graph above shows the attenuation vs. wavele...
Attenuation in dB km-1 (e 01 0.5 005 0 I 1.2 Wavelength (um) 90 9 1 The graph above shows the attenuation vs. wavelength characteristics for a typical silica based optical fibre. (3 marks) Describe the physical processes responsible for optical attenuation at short wavelengths, long wavelengths and the peaks at wavelengths of 1.2 and 1.4 um? (2 marks) What are the implications of the graph above for silica fibre long distance communications? b) A fibre has a core refractive...
a step index fiber with large core diameter compared with the wavelength of the transmitted light...
a step index fiber with large core diameter compared with the wavelength of the transmitted light has an acceptance angle in air of 22 and a relative refractive index difference of 3%.Estimate the numerical aperture and the critical angle at the core-cladding interface for the fiber
1. An optical fiber has a core diameter of 4 micro-meters and the cladding refractive index...
1. An optical fiber has a core diameter of 4 micro-meters and the cladding refractive index n-= 1.46. In order to have a single mode propagation wavelengths at 850nm and above what is the maximum core refractive index we should use?
QUESTION 1 1.1 In any long-haul optical fibre communications channel, it is important to have a...
QUESTION 1 1.1 In any long-haul optical fibre communications channel, it is important to have a large Bandwidth-Length Product (Hz-km). Name 4 things that could be considered in order to increase the Bandwidth-Length Product of a specific length of optical fibre. (4) 1.2 An optical fibre has a core diameter of 9 um and a refractive index of 1.466. The cladding refractive index is 1.442. 1.2.1 Determine if the fibre will permit single mode transmission at a wavelength of 1320...
Graded-index plastic optical fibre (GI POF) is expected to be used for high- speed local area...
Graded-index plastic optical fibre (GI POF) is expected to be used for high- speed local area networks (LANS) because of its large core which allows for low cost and easy installation. A particular GI POF has a core diameter of 200um, a maximum core index of 1.500 and a numerical aperture of 0.30. 2.c.i 2.c.ii What is the maximum acceptance angle for this fibre? [2 marks] What is the refractive index of the cladding material for this fibre? 12 marks/...
12 = n* (1 – 21 )] 4. Consider a multimode fiber with core refractive index...
12 = n* (1 – 21 )] 4. Consider a multimode fiber with core refractive index given by na = n; Let n = 1.5, 4= 0.01, a = 50mm. Calculate: - rnaxla (a) the maximum value of the launch angle & to maintain ... <a: (b) the axial distance at which the ray again crosses the axis. Next, consider a ray crossing the fiber axis at 5 deg with respect to that axis. Find (c) the maximum radial distance...
plz ans as sonn as possible thanks DQuestion 8 10 pts An 11 km long graded-index...
plz ans as sonn as possible
thanks
DQuestion 8 10 pts An 11 km long graded-index multimode fibre has an optical bandwidth distance product of 2.1 GHz.km. What is the total fibre dispersion per kilometre for the multimode fibre? 178.6 ps/kon 893.6 ps/km 209.5 ps/rn 980.75 ps/km 8.11 ps/km 81.85 ps/km D Question 9 10 pts A fibre has a total rms pulse broadening of 3.5 ns. The laser and photodetector connected to either end of the fibre have bandwidths...
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1.55 um 2, A 1.55 μm digital communications system operating at 4 GBits/s receives an average power of -24 dBm at the detector. On the assumption that 1 and 0 bits are equally likely to occur how many photons are received within each 1 bit? 3. A1.3 um digital communications system operating at 3 GBits/s receives an average power of -29 dBm at...
Attenuation in dB km-1 (e 01 0.5 005 0 I 1.2 Wavelength (um) 90 9 1 The graph above shows the attenuation vs. wavelength characteristics for a typical silica based optical fibre. (3 marks) Describe the physical processes responsible for optical attenuation at short wavelengths, long wavelengths and the peaks at wavelengths of 1.2 and 1.4 um? (2 marks) What are the implications of the graph above for silica fibre long distance communications? b) A fibre has a core refractive...
1. An optical fiber has a core diameter of 4 micro-meters and the cladding refractive index n-= 1.46. In order to have a single mode propagation wavelengths at 850nm and above what is the maximum core refractive index we should use?
QUESTION 1 1.1 In any long-haul optical fibre communications channel, it is important to have a large Bandwidth-Length Product (Hz-km). Name 4 things that could be considered in order to increase the Bandwidth-Length Product of a specific length of optical fibre. (4) 1.2 An optical fibre has a core diameter of 9 um and a refractive index of 1.466. The cladding refractive index is 1.442. 1.2.1 Determine if the fibre will permit single mode transmission at a wavelength of 1320...
Graded-index plastic optical fibre (GI POF) is expected to be used for high- speed local area networks (LANS) because of its large core which allows for low cost and easy installation. A particular GI POF has a core diameter of 200um, a maximum core index of 1.500 and a numerical aperture of 0.30. 2.c.i 2.c.ii What is the maximum acceptance angle for this fibre? [2 marks] What is the refractive index of the cladding material for this fibre? 12 marks/...
12 = n* (1 – 21 )] 4. Consider a multimode fiber with core refractive index given by na = n; Let n = 1.5, 4= 0.01, a = 50mm. Calculate: - rnaxla (a) the maximum value of the launch angle & to maintain ... <a: (b) the axial distance at which the ray again crosses the axis. Next, consider a ray crossing the fiber axis at 5 deg with respect to that axis. Find (c) the maximum radial distance...
plz ans as sonn as possible
thanks
DQuestion 8 10 pts An 11 km long graded-index multimode fibre has an optical bandwidth distance product of 2.1 GHz.km. What is the total fibre dispersion per kilometre for the multimode fibre? 178.6 ps/kon 893.6 ps/km 209.5 ps/rn 980.75 ps/km 8.11 ps/km 81.85 ps/km D Question 9 10 pts A fibre has a total rms pulse broadening of 3.5 ns. The laser and photodetector connected to either end of the fibre have bandwidths...
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