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ECE4043: Optical Communications Design
project: system specifications (This is worth 15% of the total assessment for this unit) Network Distribution: Optical Fibre Backbone Network Transmission link distance: 800 km (approx. Melbourne to Sydney) Routing: Over land, planning a route between Melbourne and Sydney. Route map needed for report, and description of difference between test scenario and real- world route. Transmission techniques: Dense Wavelength Division Multiplexing, using commercially available transmitters/receivers/transponders/transceivers. Transceivers to use pol-mux. QPSK (or higher order QAM) as a signal format. Data sheet(s) needed for report. BER: As specified by data sheets. Data sheet needed for report. Software: MATLAB (interfacing partially through some Python scripts). DSP for pol. mux QPSK provided with comments. Example DSP for higher order QAM also provided (minimally commented). Network configuration: Point-to-point link. Several spans of fibre linked by EDFAs (test system: 10x 80km spans). Transceivers only at end points of link (i.e. no O-E-O conversion in the link). Total capacity: Design for 1 Tb/s. Wavelength provisioned, with justification for allocated data budgets. Testing with a single wavelength channel. Wavelength regions: C-band 1530 – 1565 nm. Total continuous bandwidth available: 1 THz. Channel grid to be defined by the project, as made possible by commercially available components. Transmission medium: SMF-28 (G.652 ITU Standard). Optical Amplifiers: Erbium doped fibre amplifiers. Data sheet(s) needed for report. Photonic components: DWDM mulitplexers/Demultiplexers, couplers etc. Data sheet(s) needed for report. Transmitters and receivers: Refer to commercial products at websites of manufacturers’. Data sheet(s) needed for report. Design groups: Groups of 3 engineers Report requirements: Must show calculations of predicted performance assuming linear system (ASE, chromatic dispersion, PMD etc.). Remember that this is a design exercise. You are allowed to make any approximations as long as they do not lead to incorrect results or conclusions. Must work in simulation with a nonlinear fibre model. Must give detailed simulation parameters and datasheets justifying them. SUBMISSION DATE: 22 October 2020, Friday, Week 12, Semester 2. Calculations (requirements) • 0SNR: use 58 equation across whole link; this is approximate only, to give an indication of link performance and required power. Compare this with simulated required OSNR, and relate this to the provided data sheet(s). • CD: this needs to be for each node (ie. show the residual CD at each node); find the maximum tolerance to CD off a data sheet. • PMD: Find a PMD tolerance of your system off the transponder datasheet and calculate the total PMD of your link using the parameters from the fibre datasheet and device datasheet(s). Is route PMD less that tolerance of your system? Tips for project structure 1. Plan out the system. What is in the point-to-point link? What channel rates are needed? How many channels are needed? What channel spacing is to be used? How many spans, with how many EDFAs? How close a match to the text system (10x 80km spans) can you get? 2. Find data sheets for the devices used in the link.Transceivers (e.g. 100 Gb/s dual pol. QPSK), EDFAs, fibres, WDM mux/demux, etc. Do the data sheets you have found contain the information you need? Can you calculate out design requirements from these? What are the specs in terms of system impairments? 3. Set up link calculations.What’s the launch power vs. OSNR like? What is the accumulated CD? What is the accumulated PMD? What can you tell from these calculations, in terms of compatibility with your transceivers? 4. Start simulating your link. What’s the tolerance of your system to different impairments? What sort of linewidth can your system tolerate? What OSNR gets you to your pre-FEC BER threshold? What sort of tolerance do you have to residual chromatic dispersion? How do the DSP parameters (window size in phase noise compensation, # taps and error step for equalizer) effect these? Can you find an optimum setting for the DSP parameters, given the likely impairments? 5. Prepare experiments in the test link. What sort of set powers do you want to sweep with the EDFAs? Are you accounting for optical nonlinearity in the fibres? What sort of DSP parameters do you want to sweep or tune over? 6. Run initial experiments. Did the results turn out as expected? Can you see the effect of fibre nonlinearity in your test sweeps? Can you explain your results in terms of the simulations you have run? Can you plan out further tests to get the data you need? 7. Iterate testing and get final data. After analysing your initial data, plan for further tests to get the results you want to present in your report. Can you explain your results? Can you explain differences between experiment and simulation? Can you explain the differences between the test system and expected real- world performance? Marking The marking for this project is split into three components: calculations showing the system works for linear fibre; the simulations showing the system in nonlinear fibre; and the reporting, which includes justification for your design and datasheets of the components you used in your calculations and simulations, and a comparison between the real world and the testing you have worked through. Your pretend audience is a potential customer, like purchasing manager at a large telecommunications company, whom you are trying to sell your product too. You want to convince me that your product is good and to give me confidence that you can deliver the goods (not just an emulation/simulation of unrealistic components/system). Additionally, you are to keep it in a form that is quick and easy to read (so not too long). Any result included should be explained.