ASSIGNMENT– OPTICAL COMMUNICATION SYSTEM (KD7064)2020/2021 ModuleInformation ModuleTitle:Optical Communication System Module Code: KD7064 ModuleTutor: Hoa Le Minh Assessmentset by: Hoa Le Minh & Prof Fary Ghassemlooy AcademicYear: 2020-2021 DatesandMechanismsforAssessmentSubmissionandFeedback Dateofhandouttostudents:01/03/2021 Mechanismtobeusedtodisseminatetostudents:eLP DateandTimeofSubmissionbyStudent:25/04/2021MechanismforSubmissionofWorkbyStudent: eLP DatebywhichWork, FeedbackandMarkswillbereturnedtoStudents:07/06/2021Mechanism(s)forreturnofassignmentwork,feedbackandmarkstostudents:eLP AssignmentBrief Clearstatementoftheworkthatstudentsareexpectedtoundertake:Please see the instruction below FurtherInformation LearningOutcomesassessedinthisassessment:AssessmentCriteria/MarkScheme:See the guidance below. ReferencingStyle:References are included in IEEE style. Expectedsizeofthesubmission:The report should not be over 25 pages including all figures. · Report Structure: Title, Names, Abstract, Introductions, Tasks (including analysis, simulations, and results with discussions), Conclusions, and References. · Font size: 11. · References: Up to 10 – with 50% from IEEE, IET, OSA and IoP journals and books Assignmentweighting: This assignment is worth 30% of the module marks. AcademicIntegrityStatement:You must adhere to the university regulations on academic conduct. Formal inquiry proceedings will be instigated if there is any suspicion of plagiarism or any other form of misconduct in your work. Refer to the University’s Assessment Regulations for Northumbria Awards if you are unclear as to the meaning of these terms. The latest copy is available on the University website. Failuretosubmit:This coursework is compulsory. The University requires all students to submit assessed coursework by the deadline stated in the assessment brief. Where coursework is submitted without approval after the published hand-in deadline, penalties will be applied as defined in the University Policy on the Late Submission of Work. https://www.northumbria.ac.uk/static/5007/arpdf/lateappr. AnonymousMarking:University policy requires that work be marked anonymously. In order to facilitate this we request that only your student number is included on work submitted for summative assessment. (statementcanbeexcludedifworkisexemptfromanonymousmarking). Assignment task(100 marks) In this assignment you will investigate a hybrid optical fibre and visible light communications system for use in indoor environment by means of numerical simulation. As part of the last few meter access network, optical fibres are brought to homes and office from the hub to deliver high-speed internet services. The optical fibre link span from the hub to the office is 1 km, and the fibre used is a multimode step-index. At the office the optical signal from the fibre is converted back into the electrical signal using the optical receiver (Rx) which is then applied to the router and control unit. The output of the control unit is connected to the LEDs via an Ethernet cable, which delivers both power for illumination and data communications. An office will have multiple working spaces, each working space is 2 m x 2 m (L x W) and it is illuminated by a single LED-based light position at the on ceiling pointing downwards to the centre of the working space, see Fig. 1. The height of the office is 4 m. Fig. 1 System block diagram The full system specifications are: ParameterValueOptical Fibre – Multi-mode · Length · Size Core and cladding · Refractive indices for core and cladding · Bandwidth · Loss1 km 50 and 125 micro metre 1.5 and 1.46 50 MHz 0.8 dB @ 1300 nmOptical Rx – PIN photodetector · Sensitivity · Responsivity · Bandwidth · Noise power spectral density-28 dBm 0.6 A/W 80 MHz 2.8 x 10-20 WHzConnector loss – SMA0.14 dB per connectorOffice· Working space (length, width, height)2m, 2m, 4m· LED beam profileLambertian You need to develop a simulation in MATLAB to design the system based on the following tasks: Task1:Designtheopticalfibresection(40 marks) i. Determine the delay spread within the fibre considering the shortest and longest path lengths. ii. Carry out full link power budget analysis considering all the key system parameters, and therefore determine the required optical transmit power. The link margin should be 4 dB. iii. Obtain the full bandwidth budget analysis for the link from the backbone to output of the optical Rx. iv. Discuss what light source would be best for this link and explain why. Task2:DesignasingleLED–basedVLCsystem(40marks) The lighting engineer wants to optimise the LED usage by fitting a lens for each LED to ensure that the coverage of the beam is just covering every corner of a working space (to avoid the light spreading to the adjacent working space), i.e. the power received at one of the working space corners is 6 dB less than the power at the centre. In addition, this strategy will help to minimise the transmit power for each LED. Task3:Designamultiple–LED–basedVLCsystem(20marks) The engineer uses 4 LEDs now in each cell to enhance the brightness of the cell as well as flatten the illumination level in each cell. Determine the optimum position of 4 LEDs on the ceiling to achieve the most “flatten” received power (or illumination) profile on the working space floor. In each case, you need to show the calculation, the used equation/formulas with explanation, the codes (with comments in detail), and the plotted results (if applicable). Assessmentmarking guidance The assignment will be marked in accordance with the following marking scheme. In each task, you need to show the calculation, the used equation/formulas with explanation, the codes (with comments in detail), and the plotted results (if applicable). Task1(40 marks) i. 10 marks ii. 10 marks iii. 10 marks iv. 10 marks Task2(40 marks) Theory, equation, calculation, and simulation setup – 15 marks i. 10 marks ii. 10 marks Code comments – 5 marks Task3(20 marks) Theory, equation, optimization process/calculation, and simulation setup – 10 marks MATLAB code (with comments) and results – 10 marks.
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