Question 5 (Total Marks: 15 marks) a. You have been newly recruited by an optical fibre company that specialises in opti

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Question 5 Total Marks 15 Marks A You Have Been Newly Recruited By An Optical Fibre Company That Specialises In Opti 1 (229.81 KiB) Viewed 51 times

Question 5 (Total Marks: 15 marks) a. You have been newly recruited by an optical fibre company that specialises in optical fibre design. Your first assignment is to characterise a batch of newly fabricated multimode fibre that would be deployed in an in-building network. Based on the specifications of the fibre, you know that the multi-mode fibre has a core with a refractive index of 1.45 and a profile height of 1.5%. (2 marks) ii. As this fibre will be used for in-building application, determine the maximum transmission distance if the fibre is expected to support a 500 Mb/s link. (2 marks) i. What is the bit-rate-distance product of this fibre? iii. While submitting your report to the deployment team, you found out that this fibre will be deployed in a high-rise building with potential deployment length of 100 m. With this limitation placed on the fibre distance, what is the maximum bit-rate that the link can handle in this deployment? (2 marks) iv. After notifying the deployment team that the initial 500 Mb/s specification cannot be met if the transmission distance is extended to 100m, the deployment team suggested to use dispersion compensating scheme such as dispersion compensating fibre to improve the transmission bit-rate. Explain whether this can be done and why. (2 marks) b. You have been given the task to design a step-index single-mode fibre that has a numerical aperature of NA, core radius of a and able to support wavelength 2. i Show that the following equation holds if the fibre is to only support one mode. (1 marks) iii 2.405 < λ 2π (NA) a ii If you were to design a single-mode fibre that supports a wavelength at 1650 nm, what would be your fibre core radius? Assuming core and cladding refractive indices are given as 1.505 and 1.49 respectively. (2 marks) Can your designed fibre support light at 2000 nm in a single mode format? (2 marks) iv If your designed fibre is spliced with a standard single mode fibre with a core size of 10 μm in diameter, briefly explain what would happen to the light at 1650 nm when it is coupled from your designed fibre into the standard single mode? (2 marks)