Variable wavelength conversion based on fan-out grating in QPM-LN

Yiju Wang; Yuanqing Huang; Zihua Weng; Huangping Yan; Ruifang Ye; Jiangong Zhu

doi:10.1117/12.743522

19 November 2007 Variable wavelength conversion based on fan-out grating in QPM-LN

Yiju Wang, Yuanqing Huang, Zihua Weng, Huangping Yan, Ruifang Ye, Jiangong Zhu

Proceedings Volume 6782, Optoelectronic Materials and Devices II; 67820F (2007) https://doi.org/10.1117/12.743522
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

In this paper, we demonstrated for the first time variable 1.5μm wavelength conversion through cascaded second order nonlinear processes "SHG+DFG" by fan-out grating in lithium niobate waveguide. We fabricated the waveguide by annealed proton exchange in periodically poled LiNbO₃ (PPLN). The device used in this experiment is 4 cm long, has a QPM period from 14.8μm to 15.2μm, waveguide width of 12μm, proton exchange depth of 0.7μm, and was annealed for 32h at 350°C. After proton exchange in pure benzoic acid using a SiO₂ mask, the substrate was annealed in an oxygen atmosphere. The wavelength of signal light was set at 1551.3 nm. The wavelengths of tunable pump lights we used in experiment were 1543.2 and 1556.2 nm, and the corresponding grating periods were 14.87 μm and 15.03 μm, respectively. The temperature was set at 100.5°C to avoid photo refractive damage and to match the QPM peaks to the pump wavelengths. The conversion efficiency was about 10dB to be expected with the pump power 175mW in a similar device with a slightly different QPM period and operated at 125°C.

Citation Download Citation

Yiju Wang, Yuanqing Huang, Zihua Weng, Huangping Yan, Ruifang Ye, and Jiangong Zhu "Variable wavelength conversion based on fan-out grating in QPM-LN", Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67820F (19 November 2007); https://doi.org/10.1117/12.743522

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