Widely Tunable Difference Frequency Generation Around 3.4
m Using Index Dispersion Property of PPLN¹

J. H. Chang^{a, b,} *, T. T. Wang^a, and Q. H. Mao^b

^a Jiangsu Technology and Engineering Center of Meteorological Sensor Network,
Nanjing University of Information Science and Technology, Nanjing, Jiangsu, 210044 China

^b Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics,
Chinese Academy of Sciences, Hefei, Anhui, 230031 China

*e-mail: jianhuachang@nuist.edu.cn

Received October 6, 2011; in final form, October 9, 2011; published online February 6, 2012

Abstract—In this paper, the wide difference frequency generation (DFG) tuning characteristics around 3.4m
are investigated by using the index dispersion property of PPLN. With a ytterbium doped fiber laser (YDFL)
and an erbium doped fiber laser (EDFL) as the fundamental light sources, our simulation results show that the
quasi-phase matching (QPM) wavelength acceptance bandwidth (BW) for the pump is much larger than that
for the signal. Although the positions of the broadened QPM pump bands vary with the poling period and the
signal wavelength, the corresponding idler tuning ranges center around 3.4 m. With a signal wavelength of
1.57 m, an idler tuning range of greater than 170 nm is experimentally obtained in the 30 uniform grating
PPLN. When the signal wavelength and the poling period are respectively changed to 1.55 and 29.50 m, wide
DFG tuning operations around 3.4 m are also achieved with the crystal temperature adjusted to adapt the
change.

10.1134/S1054660X12030036

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