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Proceedings Paper

Experimental demonstration of PPLN-based double ring fiber laser and its application to 40 Gb/s wavelength conversion
Author(s): Jian Wang; Junqiang Sun; Qizhen Sun
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Paper Abstract

We report a novel double ring fiber laser incorporating a periodically poled LiNbO3 (PPLN) waveguide. The double ring fiber laser is formed by placing two parallel-arranged tunable filters (TFs) followed by two variable optical attenuators (VOAs) inside the PPLN-based fiber ring cavity. Two continuous-wave (CW) lasing lights can be obtained from the double ring fiber laser with their wavelengths determined by two tunable filters. Using cascaded second-harmonic generation and difference-frequency generation (SHG+DFG), as one of the lasing waves is tuned at the quasi-phase matching (QPM) wavelength of PPLN, the third idler wave is generated. It is easy to perform tunable operation simply by changing the other lasing wavelength. Based on cascaded sum- and difference-frequency generation (SFG+DFG), it is also possible to realize tunable wavelength conversion. Both input signal and converted idler can be tuned by appropriately adjusting two lasing waves. With PPLN-based double ring fiber laser, we first demonstrate stable dual-wavelength generation with minimum wavelength spacing of 0.32 nm. Then we observe SHG+DFG-based tunable triple-wavelength generation. Finally, tunable wavelength conversion at 40 Gb/s based on SFG+DFG is successfully demonstrated in the experiment. No external CW optical waves are needed, which effectively reduces the complexity and cost of the wavelength converter.

Paper Details

Date Published: 19 November 2007
PDF: 9 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67821S (19 November 2007); doi: 10.1117/12.745610
Show Author Affiliations
Jian Wang, Huazhong Univ. of Science and Technology (China)
Junqiang Sun, Huazhong Univ. of Science and Technology (China)
Qizhen Sun, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)

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