Using Saganc Loop of Optical-Injected Semiconductor Laser
Scheme for Stable and Continuous CW Wavelength-Tuning¹

C. H. Yeh^a, *, C. W. Chow^b, S. S. Lu^b, and Y. F. Wu^a

^a Information and Communications Research Laboratories, Industrial Technology Research Institute (ITRI),
Hsinchu 31040, Taiwan

^b Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University,
Hsinchu 30010, Taiwan

*e-mail: yeh1974@gmail.com

Received August 17, 2011; in final form, August 19, 2011; published online November 28, 2011

Abstract—We propose and experimentally investigate a stable and continuous wavelength-tuning laser struc-
ture by using self-injected Fabry–Perot laser diode (FP-LD) with Saganc loop scheme. In this proposed laser
scheme, the lasing wavelength can be tuned in the range of 1526.20 to 1549.75 nm with tuning-step of 1.30nm
in single-longitudinal-mode (SLM) output. Here, the maximum and minimum output powers are –7.4 and –17.0
dBm, and their corresponding side-mode suppression ratios are 52.0 and 52.8 dB/0.05 nm, respectively. More-
over, to achieve the continuous wavelength tuning, we can also adjust the temperature of FP-LD for wavelength
shifting.

DOI: 10.1134/S1054660X12010288

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