J. M. Lin, W. J. Ho*, and Y. F. Yang
Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan, China
*e-mail: wjho@ntut.edu.tw
Received June 26, 2011; in final form, September 24, 2011; published online December 28, 2011
Abstract—In this paper, we experimentally demonstrated the 1550 nm short optical pulses generation using a
TO-packaged gain-switching distributed feedback (DFB) semiconductor laser driving by 2.5 GHz radio fre-
quency (RF) signals and combining with optical injection techniques. The characteristics of the generated opti-
cal pulse by the proposed CW-mode external-injection and pulse-mode self-injection schemes are characterized
in the side mode suppression ratio (SMSR), spectrum line-width, pulse-width and root-mean-square (RMS) jit-
ter. In the CW-mode external-injection case, the SMSR of 35.5 dB, line-width of 0.235 nm, pulse-width of
47.69 ps, and RMS jitter of 1.4 ps are obtained when the optical injection ratio of 5 dB. In the pulse-mode self-
injection, however, the SMSR of 61.2 dB, spectrum line-width of 0.189 nm, pulse-width of 58.46 ps, and RMS
jitter of 1 ps are achieved and its overall performances are better than CW-mode external-injection one.
10.1134/S1054660X12020168
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