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Gamma-ray irradiation effects on dynamic gain of erbium-doped fiber amplifiers

Jou J. J., Liu C. K., Lai F. S.

Optica Applicata

2010

Vol. 40, nr 4

921--926

Experiments were made of the gamma-ray irradiation effect on the dynamic performance of erbium-doped fiber amplifiers (EDFAs). The frequency responses of EDFAs before and after irradiation are dependent on radiation dose and modulation frequency. The ac gain of EDFA with irradiation effect was also simulated, and our simulations are in agreement with the experimental results.

A multiwavelength erbium-doped fiber MOPA laser with partial overlapping linear cavities

Tseng C. L., Jou J. J., Liu C. K., Jian J. H.

Optica Applicata

2009

Vol. 39, nr 3

579-585

In this paper, we propose a multiwavelength erbium-doped fiber laser (MW-EDFL). The configuration of the MW-EDFL consists of several linear Fabry-Perot (FP) cavities and a master-oscillation-power-amplifier (MOPA). These linear FP cavities are partially overlapped and include several sections of EDFs, fiber Bragg gratings (FBGs), and a fiber loop mirror (FLM). In our design, a low cost broadband FLM and six narrowband FBGs were used to obtain a stable six-wavelength fiber laser at room temperature. Using a section of EDF as an MOPA near the output end, the output power of the MW-EDFL is promoted. The characteristics of the MW-EDFL were also simulated by the OptiAmplifier software tool. The results of simulations and experiments match each other very well. The optimizing EDF length of the MOPA is about 1.5 m and the MOPA gains are about 4 dB to 7.5 dB. The linewidth, wavelength drift, and power fluctuation of the MW-EDFL are about 450 kHz, 0.05 nm, and 0.4 dB, respectively.