Optical OFDM Passive Optical Networks for Future Fibre-to-the-Home Networks

1) Describe the need for higher-speed optical access networks.

2) What access speeds do we get now?

3) What are speed requirements in the future?

4)What is driving the demand for higher speeds?

5) What other features do future PONs need? (Low cost and power…)

Operating Principle and Limitations of Existing TDM-PONs

1) Describe how TDM-PONs operate using a diagram.

2) Describe the limitation on bit rate caused by chromatic dispersion in the optical fibers, thus show

3) Why is it becoming highly challenging to use TDM-PONs at high bit rates?

4) How is a pulse impacted by chromatic dispersion and why does this limit the bit rate?

 

Operating Principle and Advantages of OFDMA PONs

1) Operation of OFDM transceiver using block diagram

2) Describe the basic structure of an OFDM transceiver to help explain its operation using block diagram.

3) What are the advantages?

(Why this technology overcomes the limitation of fiber chromatic dispersion). Discuss the improvement in spectral efficiency and why this is an advantage and why OFDM is more tolerant to the chromatic dispersion effect (symbol length is increased)