Design and analysis of multi-wavelength fiber laser based on brillouin and hybrid gain medium
Başlık çevirisi mevcut değil.
- Tez No: 540071
- Danışmanlar: Prof. Dr. MD ZAINI JAMALUDIN
- Tez Türü: Doktora
- Konular: Mühendislik Bilimleri, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2014
- Dil: İngilizce
- Üniversite: Universiti Tenaga Nasional-UNITEN
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 166
Özet
Özet yok.
Özet (Çeviri)
Multiwavelength Brilllouin fiber laser (MBFL) and multiwavelength Brillouin Erbium fiber laser (MBEFL) are a potential optical sources in DWDM communication system. It has been proposed to increase the optical fiber bandwidth by increasing the total capacity. These two fiber laser sources depends on the Stimulated Brillioun scattering(SBS) inside the fiber. However, in BFL cavity, no real reason behind the SBS theshold reduction was investigated and no threshold reduction ratio was presented. For a theoretical studies, no closed form expression was derived to estimate the generated Stokes power. In terms of BEFL cavity, many experimental techniques has been conducted in order to enhance the laser cavity tunability. however, the proposed techniques either adds more complexity and cost to the laser cavity or it limits the number of the generated Stokes lines. In this thesis, the design, analysis, and development of a multiwavelength fiber laser based on Brillouin and hybrid gain mediums is presented. Different laser designs have been successfully demonstrated using Brillouin gain in optical fiber and a combination of Brillouin gain and Erbiumdoped fiber (EDF) amplification. The theoretical and experimental performance parameters obtained from these laser structures utilizing Brillouin gain medium are threshold power and the Stokes signals power. The results are taken from the studies which have been carried out to analyze the effects of Brillouin pump (BP) power, cavity optical reflectivity and the single mode fiber (SMF) length. The effects of unidirectional and bi-directional cavity structure on SBS threshold power as well as on the Stokes power are experimentally investigated. The comparison indicates that the reduction in SBS threshold is due to the Brillouin amplification effect. The induced Brillouin gains improved the Stokes threshold power and the SBS threshold was reduced up to 50% and 75% in linear cavity BFL compared to its values in recycling technique in which single feedback is used and conventional technique in which no feedback is used. An accurate theoretical model of multi-wavelength MBFL is developed by analytically solving cascade-stimulated Brillouin scattering equations in a linear cavity. Furthermore, an analytical approach that can be used to predict the generated Stokes signals power is derived. Due to the limitation in the number of Stokes generation in BFL cavity, a hybrid gain mediums of Brillouin and EDF gains are used to perform MBEFL. The influence due to the inclusion of the passive EDF booster section toward the performance of BEFL laser cavity in terms of number of generated Stokes, tuning range, and lasing cavity threshold are investigated. Finally, a new and simple tunable L-band MBEFL using passive EDF as an absorber section is experimentally demonstrated. The impact of the passive EDF absorber section toward the tunability of the BEFL laser cavity is presented. Laser cavity tunability is effectively enhanced using such new technique and an increment of 47% is taken as compared to the conventional linear cavity BEFL.
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