Generation of Optical Waveforms in 1.3-m
SOA-Based Fiber Lasers¹

J.-Y. Wang^a, K.-H. Lin^a, *, and H.-R. Chen^b

^a Department of Science, Taipei Municipal University of Education, 1, Ai-Kuo West Road, Taipei 100, Taiwan

^b Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University,
1001, Ta-Hsueh Road, Hsinchu 300, Taiwan

*e-mail: khlin@tmue.edu.tw

Received June 19, 2011; in final form, June 29, 2011; published online October 24, 2011

Abstract—Passive optical waveform generation is obtained in fiber lasers using a 1.3-m semiconductor opti-
cal amplifier (SOA) as the gain medium. Various waveforms, including square wave, staircase wave, triangular
wave, pulse, and dark pulse are generated in SOA-based fiber lasers by adjusting intracavity polarization con-
trollers. The passive waveform generation might be attributed to the SOA gain dynamics and the enhanced non-
linear interaction at the 1.3-m zero dispersion wavelength of traditional single-mode fiber (SMF), as well as
the interference effect between the two sub-cavities of fiber laser. With figure-8 cavity configuration, 1250th-
order harmonic pulses have been successfully demonstrated. We have also obtained a free-running SOA-based
fiber laser with 3-dB spectral width of 16 nm, and the center wavelength can be tuned over 45 nm range.

10.1134/S1054660X11230198

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