The maximum capacity of an optical fiber transmission system more than doubled every year to match the fast-growing communication need. The technology break through in dry fiber fabrication opens the possibility for fiber bandwidth all the way from 1.3 £gm to 1.6 £gm. The fast increasing demand of communication capacity results in the emergence of wavelength division multiplexing (WDM) technology, which results in the need for wideband optical amplifier. Cr4+:YAG has a strong spontaneous emission that covers 1.3 £gm to 1.6 £gm. Besides, its absorption spectrum is between 0.9 £gm to 1.2 £gm, which matches with the pumping source in current erbium doped optical amplifier. Such a fiber is, therefore, eminently suitable for optical amplifier applications.
We have successfully fused the double cladding Cr4+:YAG crystal fiber with single mode fiber by fusion splicer. The crystal fibers are grown by the laser-heated pedestal growth technique. The splicing parameters are optimized to achieve an insertion loss of 3.8 dB. Througth the splicing images, we can quantitatively analyze the splicing results caused by fine tuned parameters, and aimed at the evolution of the ASE, that is dissipated into inner cladding. The simulation program is revised with better fitting. We can find the reason why net gain is under 0 dB by simulation result, and find the way to improve. Numerical simulation indicates that the gain can reach 2 dB at 1 W pump, if the core diameter of the double cladding Cr4+:YAG crystal fiber is reduced to 10 £gm.
In the future, we¡¦ll reduce the core diameter of Cr4+:YAG crystal double cladding fiber to less than 10 £gm, and enhance the Cr4+ ion concentration to lower the insertion loss after two-sided splicing, Hopefull, super-wideband optical amplifier can be realized.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0717106-154337 |
| Date | 17 July 2006 |
| Creators | Su, Weu-zhi |
| Contributors | Chao-kuei Lee, Andy Kung, Sheng-lung Huang, Tao-yuan Chang, Yen-sheng Lin |
| 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-0717106-154337 |
| Rights | restricted, Copyright information available at source archive |
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