In this coursework, students are required to formulate the design of a fibre-optic communication system linking two locations of at least 500 km apart. They are also required to look for commercial products of the photonic components that can be used to implement the design. Specific details of both the design (e.g. in the form of block diagrams, list of components) and product information of the photonic components must be well documented in a design report. This coursework will carry 70% of the module mark. Design Specifications A dense wavelength division multiplexing (DWDM) fibre-optic communication system with at least 10 channels and the following characteristics: 1. distance: 500 km or longer (between your hometown and Suzhou) 2. system capacity: 100 Gbps or above (channel bit rate 10 Gbps) 3. fibre type: single-mode silica fibres with no more than 0.4 dB/km loss and 20 psm/km chromatic dispersion 4. optical transmitter power: 3 dBm 5. optical receiver sensitivity (minimum detectable power): -30 dBm 6. transmission wavelength: 1530 nm 1540 nm (Note: The C-band of optical wavelengths for telecommunication is 1530 nm - 1565 nm) As specified in point 6 above, the fibre-optic link should operate at the wavelength of about 1.5 um, the transmission window of silica fibres with the minimum attenuation. The system should consists of a minimum number of photonic components while meeting the design requirements. In building the fibre-optic communication system, commercial products of the photonic components should be chosen in such a way that the implemented system will achieve the required performance but keeping the total cost to a minimum. It is also recommended to include some power loss margin in the fibre-optic link. Questions as Design Guidelines 1. Where is your hometown? 2. How far is your hometown from the XJTLU campus at Suzhou Industrial Park (SIP)? Use this distance for the fibre-optic link. If your hometown is less than 500 km from SIP, which of the following Chinese city is closest to your hometown? Beijing (1030 km), Xi'an (1150 km), Haikou (1630 km), or Kunming (1890 km). Use the corresponding distance for the fibre-optic link then. 3. What optical sources and how many should be used for the system? 4. What optical detectors and how many should be used for the system? 5. How much is the optical fibre attenuation over a distance of your answer in Question 2? 6. At what distances will the optical signal will become much attenuated and optical amplifiers will be needed? How many and what optical amplifiers will be needed for the whole fibre-optic link? 7. At what distances will the dispersion become too serious and dispersion compensation will be needed? What photonic components and how many are needed for the dispersion compensation? (Assume the maximum spread of the binary signals is half of the time interval between each bit). 8. If there are choices of photonic components to achieve the same function in the fibre-optic link, why one is preferred over the other? What quantitative support is available for the design choice? In this coursework, students are required to formulate the design of a fibre-optic communication system linking two locations of at least 500 km apart. They are also required to look for commercial products of the photonic components that can be used to implement the design. Specific details of both the design (e.g. in the form of block diagrams, list of components) and product information of the photonic components must be well documented in a design report. This coursework will carry 70% of the module mark. Design Specifications A dense wavelength division multiplexing (DWDM) fibre-optic communication system with at least 10 channels and the following characteristics: 1. distance: 500 km or longer (between your hometown and Suzhou) 2. system capacity: 100 Gbps or above (channel bit rate 10 Gbps) 3. fibre type: single-mode silica fibres with no more than 0.4 dB/km loss and 20 psm/km chromatic dispersion 4. optical transmitter power: 3 dBm 5. optical receiver sensitivity (minimum detectable power): -30 dBm 6. transmission wavelength: 1530 nm 1540 nm (Note: The C-band of optical wavelengths for telecommunication is 1530 nm - 1565 nm) As specified in point 6 above, the fibre-optic link should operate at the wavelength of about 1.5 um, the transmission window of silica fibres with the minimum attenuation. The system should consists of a minimum number of photonic components while meeting the design requirements. In building the fibre-optic communication system, commercial products of the photonic components should be chosen in such a way that the implemented system will achieve the required performance but keeping the total cost to a minimum. It is also recommended to include some power loss margin in the fibre-optic link. Questions as Design Guidelines 1. Where is your hometown? 2. How far is your hometown from the XJTLU campus at Suzhou Industrial Park (SIP)? Use this distance for the fibre-optic link. If your hometown is less than 500 km from SIP, which of the following Chinese city is closest to your hometown? Beijing (1030 km), Xi'an (1150 km), Haikou (1630 km), or Kunming (1890 km). Use the corresponding distance for the fibre-optic link then. 3. What optical sources and how many should be used for the system? 4. What optical detectors and how many should be used for the system? 5. How much is the optical fibre attenuation over a distance of your answer in Question 2? 6. At what distances will the optical signal will become much attenuated and optical amplifiers will be needed? How many and what optical amplifiers will be needed for the whole fibre-optic link? 7. At what distances will the dispersion become too serious and dispersion compensation will be needed? What photonic components and how many are needed for the dispersion compensation? (Assume the maximum spread of the binary signals is half of the time interval between each bit). 8. If there are choices of photonic components to achieve the same function in the fibre-optic link, why one is preferred over the other? What quantitative support is available for the design choice