Flattop Broadband Wavelength Converters Based on Cascaded Sum+Difference Frequency Generation

doi:10.13190/j.jbupt.2018-311

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2019, Vol. 42 ›› Issue (5): 127-132.doi: 10.13190/j.jbupt.2018-311

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Flattop Broadband Wavelength Converters Based on Cascaded Sum+Difference Frequency Generation

LIU Tao, SUN Chun-yang, ZHU Cong, WANG Ping-ping, FANG Xin-xin

Department of Electronic and Communication Engineering, North China Electric Power University, Hebei Baoding 071003, China

Received:2018-12-18 Online:2019-10-28 Published:2019-11-25

Abstract

Abstract: In order to improve the conversion characteristics of wavelength converters,the effect of the segmented quasi-phase matched grating structure in the periodically poled lithium niobate crystal on the characteristics of wavelength converters based on cascaded sum + difference frequency generation is studied. For both of single-pass and double-pass configurations, high conversion efficiency, large conversion bandwidth, and good flatness can be achieved simultaneously by increasing the number of segments and optimizing the poling period of each segment. Under the same conditions, the conversion efficiency and flatness of the double-pass configuration are better, but the conversion bandwidth is slightly worse than that of the single-pass configuration. Compared with the method of shifting the wavelength of one of the pump light, the use of segmented quasi-phase matched grating structure in wavelength converter can obtain almost the same flatness but better conversion efficiency and conversion bandwidth. Moreover, the effect of crystal length on the characteristics of a wavelength converter based on the segmented quasi-phase matched grating structure is also investigated.

Key words: bandwidth, conversion efficiency, cascaded sum + difference frequency generation, segmented quasi-phase matched grating structure, flatness

CLC Number:

TN913.7

LIU Tao, SUN Chun-yang, ZHU Cong, WANG Ping-ping, FANG Xin-xin. Flattop Broadband Wavelength Converters Based on Cascaded Sum+Difference Frequency Generation[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2019, 42(5): 127-132.

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Flattop Broadband Wavelength Converters Based on Cascaded Sum+Difference Frequency Generation

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