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University: University of Vigo

Professor: Francisco J. Fraile-Pelaez

Associate Lecturer: Francisco J. Diaz-Otero

Department: Signal Theory and Communications

Research: Optoelectronic devices, Optical communications, nonlinear optics, quantum cryptography, quantum optics, terahertz technologies.

Title: Network design with OPNET WDM

This work (in progress) is focused on designing a core optical transport network (OTN) in Spain. The project illustrates:

- Network layering

- Resilience

- Optical transparancy limititations ( w.r.t Optical Switching and Transmission)

- Network Planning

Taking into account the general overview of the scenario: an existing topology (connectivity parameters at OTS/OMS/OCH layer ), description of existing equipment, functionality, cost (OADMs, WP-OXCs with Integrated Terminal, Multiplexers that are wavelength independent, interfaces, etc...) and client traffic demands, the project design the OTS link to overcome transmission impairments and calculate the cost of the network. The project also dimensions the network according to traffic matrices without and with (1+1) protection taking into account the cost involved. Finally, there are some suggestions about redefining the network to create a ring topology (1+1 and OTS link disjoint protection).

Title: Simulation of 802.16e WiMAX Network combined with 802.11 hotspots

802.11 Wireless LAN creates small hot spots allowing to access the Internet wirelessly, avoiding the use of cable or ADSL in remote areas. WiMax is a wireless MAN technology that offers a good alternative for the backhaul to the WLAN (fixed or mobile) hot spots. We plan to investigate several issues in such an environment, such as:

- Number of users per WiMax channel, or how many WiMax channels/ bandwidth do we need to allocate a provided number of users.

- Does the WiMax backhaul work efficiently?

-Can we provide QoS support for the WLAN users?

-Can we provide real-time video transmission with QoS for the WLAN users?

Teaching: Optical communications (5th year - Telecommunications Engineer)

We want to use OPNET software to gain an understanding of optical networks and to start an introductory course in optical network planning, connected with point 5.2 (Optical Networks and Future Trends) in the class syllabus. The student should aquire skills in the Network Planning tool WDM Guru to understand how such tools can aid a network designer.


The projects designed in the class should illustrate issues such as:

- Network layering

- Resilience

- Optical Switching and Transmission

- Network Planning

Class syllabus and topics:

1. Overview of optical fiber Principles and Technology

1.1 Introduction to Optical Communications

1.2 Propagation, dispersion and atenuation

1.3 Bending Loss, optical Fiber Stress and Reliability

1.3 Optical Fiber Types, Specs and Cables

1.4 Jointing Principles for optical Fiber, Connectors and Splicing Technology

1.5 Couplers and Switches

1.6 Manufacture

2 Principles of Lasers and Photodiodes

2.1 Optical Sources, Introduction and Review

2.2 Light Emitting Diodes

2.3 Laser fundamentals

2.4 Semiconductor Laser diode structures and characteristics

2.5 Photodiodes and Noise in PDs

3 Optical Transmitters and Receivers

3.1 Optical TX and RX Introduction

3.2 Optical Transmitters and Laser control

3.3 Receiver Front Ends

3.4 Other Optical Receiver Functions

4 Optical Systems and planning

4.1 Overview of Optical System Design and Power Budgeting

4.2 Statistical Optical Power Budgeting

4.3 Power Budgeting for SDH Systems

5 Optical Multiplexing and networking

5.1 DWDM and Optical Amplification

5.2 Optical Networks and Future Trends

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