The assignment should be presented as follows:
Page 1: Cover Page:
Page 2 onwards:
- Answers to the questions with appropriate predictions, calculations and
- References: Any sources used to find out more I.e. textbooks, journal/ conference papers, websites, etc. must be in IEEE style format.
- Appendix: MATLAB code and other results and calculations (must be part of your main document).
The assignment will be assessed on the depth of conceptual understanding shown for each task. It’s important not only to present correct results/graphs/code but also to be able to analyse and discuss what your results are showing and how they link in with the concepts behind optical communications.
Assignment 2: Optical Communications
This assignment is going to examine how you design an optical fibre communication system capable of transmitting and receiving data at a prescribed maximum bit rate. You will be required to demonstrate that you can design the parameters required for this system (number of optical fibre segments and the required single mode laser optical output power) and answer some descriptive questions about the system.
Part A: System design
You are required to design an optical fibre communication system to transfer binary data at a rate of at least 1 Gbit/sec. The system is to operate at an optical wavelength of 1550 nm and comprise of a single-mode laser diode, an Erbium-Doped Fibre Amplifier (EDFA), multiple sections of single mode optical fibre, each 2.5 km in length, a photodetector, optical connectors and fibre splices between each 2.5 km length of fibre.
The specifications for the system are as follows:
Table 1 Optical fibre system parameters.
| Parameter: | Value: |
| Optical wavelength: | l = 1550 nm |
| Optical fibre: | single mode optical fibre |
| Fibre loss: | 0.25 dB/km |
| Fibre chromatic dispersion: | 17 ps/(nm.km) |
| Splice loss: | 0.1 dB per splice |
| Connector loss: | 0.5 dB per connector |
| Laser diode full rms spectral width: | Dl = 0.2 nm |
| Laser diode rise time: | ts = 0.1 ns |
| EDFA gain: | 25 dB |
| Photodetector rise time: | td = 0.2 ns |
| Photodetector sensitivity: | –30 dBm |
| Loss margin: | 3 dB |
- Calculate the maximum overall length of the system (L km) if the system uses NRZ binary digital coding and it is to have a minimum bit rate of 1 Gbit/s.
- How many 5 km lengths of optical fibre are required?
- How many optical fibre splices are required?
- Calculate the minimum required optical power from the laser diode in
- Calculate the laser diode optical power in
Part B: Discussion questions
- Suggest some possible changes to the system that would enable a higher bit rate to be achieved, given that you must use the same optical fibre as specified in Table 1 above and the data is still transmitted using NRZ coding. Make sure that you explain why each change will improve the system bit
- Your manager has told you that the system cost is too high, and you must replace the single mode optical fibre with a cheaper graded index multi-mode optical fibre. Explain what effects this change will have on the system performance, assuming typical performance for the graded index multi-mode fibre (state what parameters of the fibre are important and what values you are assuming for the graded index multi-mode fibre parameters).
Our Academic Assistance: service is all about doing research and being good at it. The more research one will do, the better the paper will turn out.
Expert's Answer
Chat with our Experts
Want to contact us directly? No Problem. We are always here for you
Your future, our responsibilty submit your task on time.
Order Now
Get Online
Assignment Help Services
