Dual-Reflected-Structure Erbium-Doped Fiber Laser
in Single-Longitudinal-Mode for Wavelength-Tuning¹

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

^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, depew@itri.org.tw

Received December 5, 2011; in final form, December 6, 2011; published online April 3, 2012

Abstract—In this work, we propose and demonstrate a dual-reflected-structure erbium-doped fiber (EDF) laser
with a linear cavity using a passive saturable-absorbor-based (SAB) filter to achieve single-longitudinal-mode
(SLM) lasing. Here, we can observe the wavelength tuning range between 1530.0 and 1562.0 nm with the out-
put powers of –13.7 to –7.6 dBm and optical signal to noise ratios (OSNRs) of 35.4 and 47.9dB/0.05nm,
respectively. Moreover, when the lasing wavelength is tuned to the longer wavelength gradually, the obtained
output power and SNR increase. This is because the Er⁺ gain can be suppressed and moves to the longer wave-
length via the proposed fiber laser structure. In addition, the output stability of the proposed laser has also been
analyzed and studied.

DOI: 10.1134/S1054660X12050337

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