Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6888428 | Optical Fiber Technology | 2014 | 11 Pages |
Abstract
Semiconductor DFB (Distributed feedback) laser diodes with an operating wavelength of 1064Â nm, which is suitable for pulse-on-demand fiber laser, have been developed. The stable performance of CW and nanosecond/picosecond pulsed operation is reviewed. By applying gain-switching operation with a simple direct modulation technique, 50-ps pulse generation with a stable spectral single-mode property was obtained. For the efficient amplification of the obtained 50-ps pulse, a monolithic semiconductor optical amplifier (SOA) was integrated into the DFB lasers. An improved peak power of 300Â mW at 50-ps pulse was observed with limited optical noise injection when the synchronous modulation technique of the DFB and the SOA was employed. Short cavity lasers showed a high-frequency response compared to the original DFB lasers and achieved a short pulse width of 13Â ps by standard gain-switched operation.
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Authors
Yoshitaka Yokoyama, Kan Takada, Takeo Kageyama, Shin Tanaka, Hayato Kondo, Satoshi Kanbe, Yasunari Maeda, Reio Mochida, Kenichi Nishi, Tsuyoshi Yamamoto, Keizo Takemasa, Mitsuru Sugawara, Yasuhiko Arakawa,