Notice bibliographique
Résumé
In this thesis the theory of operation of single-mode erbium-doped fiber amplifiers pumped at 980 nm is described. Details of the derivation of the general rate equation for the propagation of signal, pump, and amplified spontaneous emission are provided. Based on this equation, and McCumber's theory of phonon-terminated optical masers, two closed form expressions are derived. In one of them, the fluorescence spectrum of an erbium-doped fiber is related to its spectral absorption coefficient. Based on this expression, a rigorous basis for the assessment of the applicability of McCumber's theory to the study of [sup 4]I[sub 13/2] ⇔ [sup 4]I[sub 15/2] transitions in erbium-doped fibers has been established. For the cases of five silica-based erbiumdoped fibers, experiments were performed and the results were used to validate this expression. Another important benefit of this expression is that it does not require a measurement of silica-based fiber's fluorescence spectrum, as it can be simply calculated from the spectral absorption coefficient, simplifying fiber characterization. The other closed form expression, provides a simple means for calculating absorption and emission cross-sections of erbiumdoped fibers using the easily measured spectral absorption coefficient, the gain coefficient at one particular wavelength, and the fluorescence lifetime. Also, based on this expression, an analytical method for the simple determination of the erbium ion concentration inside the fiber core is proposed. Experiments were performed to evaluate the cross-sections of an erbium-doped fiber over the wavelength range 1400-1650 nm. To check the accuracy of the calculated cross-sections,saturation powers at the wavelengths 1530 nm and 1550 nm were measured and results compared with the ones calculated from the cross-sections, obtaining agreements within 6%. Problems and difficulties associated with the conventional techniques for the measurement of the spectral fluorescence and of the fluorescence lifetime are described. Also new experimental setups were designed to simplify the measurement of these parameters. Furthermore, experimental techniques for the measurement of other fiber parameters such as, spectral absorption coefficient, gain coefficient, and signal saturation power are described. The new theoretical and experimental techniques presented in this thesis can provide a much simpler and more accurate means for characterizing erbium-doped fibers, improving the accuracy of the numerical models commonly used for modeling erbium-doped fiber amplifiers.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».