With the rapid growth of optical telecommunication, the low-loss windows from 1.3 to 1.6 £gm are available by using the technology of dry fiber fabrication. The operation range such as commercial Er-doped fiber amplifiers (EDFAs) is only 70 nm, so it is interesting to develop the broadband fiber amplifiers. The Cr ions classified into transition metals are doped in specific host materials to be a gain medium. The spectra near infrared range have shown 300 nm.
In this study, we measure and develop the material and optical properties of Cr-doped fibers (CDFs) fabricated by drawing-tower technology. In the fabrication of CDFs using rod-in-tube (RIT), the smallest loss at 1550 nm is 0.08 dB/cm. The composition of core is 84% SiO2 and the structure is almost amorphous, but there is a little £^-Al2O3 nano-crystalline structure. In the fabrication of CDFs using modified RIT (MRIT), the smallest loss is 0.03 dB/cm. Both of CDFs fabricated by RIT and MRIT, the fluorescence intensity is weak. In the fabrication of CDFs using powder-in-tube (PIT), the smallest loss is 0.33 dB/cm. The 3dB emission spectrum is from 0.8 to 1 £gm and power density is 6 nW/10nm. The profile of spectra is difference because of Cr ions in distorted structure which allowed a wide distribution of sites.
In the future, measure absorption spectra and analyze the core¡¦s composition dependence of the emission of CDFs to provide fabrication optimization. Promoting the spontaneous emission intensity makes CDFs for novel fiber lasers and broadband fiber amplifiers.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0723110-113005 |
| Date | 23 July 2010 |
| Creators | Wang, Bo-Cyuan |
| Contributors | Sheng-Lung Huang, Sin-Wei Guo, Yi-Chung Huang, Jau-Sheng Wang, Wood-Hi Cheng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723110-113005 |
| Rights | not_available, Copyright information available at source archive |
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