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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

WDM over POF τεχνολογία στο δίκτυο μετάδοσης κινητής τηλεφωνίας

Μπανιάς, Κωνσταντίνος 13 November 2008 (has links)
Στην συγκεκριμένη εργασία παρουσιάζεται ένα μοντέλο προσομοίωσης των Πολυμερών Οπτικών Ινών και συγκεκριμένα των GI-POF ικανό να υπολογίζει την κρουστική απόκριση και τη διασπορά των συγκεκριμένων ινών. Επίσης ακολουθούν προσομοιώσεις 2 απλών συστημάτων μετάδοσης μέσω POF με λέιζερ και φωτοδιόδους χιονοστοιβάδας και ένα πλήρες προσομοιωμένο σύστημα μετάδοσης 2 καναλιών με πολυπλεξία μήκους κύματος μέσω των POF. Σχολιάζονται τα αποτελέσματα και η δυνατότητα χρήσης των ινών στη δομή του δίκτυου Μετάδοσης Κινητής Τηλεφωνίας. Επίσης αναλύονται όλα τα πιθανά πρωτόκολλα για τοπικά οπτικά δίκτυα και όλες οι πληροφορίες για τις POF, τους κατάλληλους πομπούς και δέκτες που μπορούν να χρησιμοποιηθούν σε μελλοντικές εφαρμογές. / In the specific project it is presented a simulation model of Polymer Optical Fibers and especially of GI-POF capable of calculating the impulse response and the dispersion of the specific fibers. Also next, simulations were realised of 2 simple transmission systems via POF with laser and avalange photodiodes, and a complete simulated transmission system with 2 channels with Wavelegth Division Multiplexing via POF. Results are being discussed as also the possibility of POF use in structure of Transmission Network of Cellular Telephony. In addition, all available protocols for local optical networks are described and all necessary information about POF, suitable transmitters and receivers that can be used in future applications.
2

Coupling Efficiency of Graded-Index Polymer Optical Fiber

Liu, Chia-i 25 July 2009 (has links)
The effects of geometry parameters of graded-index polymer optical fiber (GI-POF) components on the coupling efficiency and signal mixed proportion are studied in this thesis. Simulation and experimental approaches are used to investigate the effects of light sources on the coupling efficiency of misalighment, Y-couplers and V-groove couplers. Two different light sources are employed in this study: Laser diode (LD) and vertical-cavity surface-emitting laser (VCSEL). The optimum coupling angle and refractive index of filler in the Y-coupler are studied with a light-emitting diode (LED) light source. A good agreement between the simulation and the experiment results is shown in this work. Furthermore, two V-groove array arrangements, i.e. the parallel V-groove array and the skew V-groove array, are proposed in this study to mix multi-light-sources. The optimum parameters of V-groove are designed to achieve the highest coupling efficiency. The performances of different V-groove array arrangements have also been demonstrated for multi-signal mixing.

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