Pulling Doped-YAG Single-crystal Fibers : Growth, Characterization, and Applications

ISBN-13: 9783639122299 / Angielski / Miękka / 2009 / 116 str.

Chia-Yao Lo

Opis

Pulling bulk crystal into fiber is suitable for dvice applications in optical communications because of its structural similarity to silica fiber. Among fiber growth techniques, the laser-heated pedestal growth method (LHPG) was adopted. It is crucible free and can therefore produce high-quality single crystals. However, interface loss of the fiber is one of the main causes of optical loss. In order to reduce the loss, a proper method to clad the fiber is important for high performance device. For laser application, high-efficient Nd:YAG lasers were demonstrated using gradient-index crystal fibers. For ASE and optical amplifier applications, Cr4+:YAG crystal fiber was studied due to its fluorescence just covering the low loss window of optical fiber. To reduce the fiber diameter and propagation loss, a novel cladding technique, codrawing LHPG, was developed. A double-clad fiber was successfully grown by the technique. As much as 2.36 mW of ASE with a bandwidth of 265 nm was demonstrated. Up to 16-dB of gross gain at 1470 nm was also achieved. It is the first transition metal-doped fiber amplifier in the optical communication band.

O autorze

Chia-Yao Lo received his Ph.D. in electro-optical engineering
from National Sun Yat-sen University. He is currently an
assistant professor in the Institute of Optoelectronic Sciences
at National Taiwan Ocean University.