Behin the trace of the dispersive impairments in optical transmission systems
- Autores: Óscar Mario Díaz Betancourt
- Directores de la Tesis: Josep Joan Prat Gomá (dir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2007
- Idioma: inglés
- Tribunal Calificador de la Tesis: Victor Polo Querol (presid.), Jaume Comellas Colome (secret.), Huug de Waardt (voc.), Idelfonso Tafur Monroy (voc.), Antonio Teixeira (voc.)
- Materias:
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- Resumen
In the last years, we have been witness of an extraordinary growth in the demand of information and telecommunications services based specially on the Internet. This increase of transmission capacity has driven to the creation of enormous optical fiber infrastructures. These infrastructures are often complex and require a supervision procedure to verify the performance of the optical systems. Any failure in the service of an optical transport network (OTN) represents significant loss for the service providers. Therefore, fault surveillance and performance monitoring are important issues to ensure the correct transfer of information to the users.
From the invention of the optical fiber the demand for capacity of these systems is increasing so fast. However, this capacity has seen limited for main hurdles such as attenuation, chromatic dispersion, crosstalk and polarization mode dispersion (PMD) between others. After to surpass the obstacle of attenuation by means of the invention of the Erbium-doped fiber amplifier (EDFA), chromatic dispersion became the main limiting factor in optical transmission system. Nevertheless, this problem was relatively easy to compensate for, due to its deterministic nature, by means of the dispersion-shifted fibers (DSF). On the other hand, several degradations occur on the optical transmission systems due to imperfections of the link components, nodes, etc. One of these impairments occurs when a channel interferes at the optical cross connect (OXC) or optical add drop multiplexer (OADM) output with crosstalk components at the same wavelength producing broadening of the pulses and consequently inter-symbol interference (ISI). Similar effects over the optical signal appear because of the PMD which is nowadays one of the most important limitation for the next-generation high bit rate transmission systems. It can severely impair the signal quality in optical communication systems with bit rates of 40 Gb/s and beyond.
