Due to the fast growing communication need, the required capacity of the optical fiber network has been more than doubled every year. The technology breakthrough in dry fiber fabrication opens the possibility for fiber bandwidth 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, enabling tens or even hundreds of channels with different wavelengths transmitted simultaneously on an optical fiber, which results in the need for ultra-broadband optical amplifier. Cr4+:YAG has a strong spontaneous emission spectrum covers from 1.3 £gm to 1.6 £gm. In addition, its absorption spectrum is between 0.9 £gm to 1.2 £gm, which matches the pumping wavelength of current erbium doped optical amplifier. Such fiber is, therefore, eminently suitable for optical amplifier applications.
In this thesis, we introduce the development of ultra-broadband optical amplifier using the Cr4+:YAG double-clad crystal fiber, which is grown by the laser-heated pedestal growth (LHPG) technique. Try to use passive tence theoretical models and numerical simulations to know we can get more than 2 dB gross gain when signal propagations two times in Cr4+:YAG double-clad crystal fiber. With the butt-coupling method, a net gain of 0.0 dB is demonstrated at 1.3W bi-directional pump power and signal double pass in Cr4+:YAG double-clad crystal fiber at present.
In the future, in order to reduce pump excited-state-absorption. We attempt to use clad-pump or side-pump scheme instead of core-pump scheme, to choose pumping wavelength at 925 nm instead of 1064 nm and to use side deposition of Yb2O3 and CuO . At the same time, we will continue to fabricate small-core-diameter Cr4+:YAG DCF to achieve a single-mode fiber and to extend its length to improve gain performance.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0728110-160211 |
| Date | 28 July 2010 |
| Creators | Li, Yu-Shaung |
| Contributors | Jau-Sheng Wang, Sheng-Lung Huang, Wood-Hi Chang |
| 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-0728110-160211 |
| Rights | not_available, Copyright information available at source archive |
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