| Summary: | 碩士 === 國立臺北科技大學 === 光電技術研究所 === 91 === In this thesis, we study the performances of an Erbium-Doped Fiber Amplifier (EDFA) injection-locked based fibre laser system by using continuous-wave and gain-switch Fabry-Perot laser diode (FPLD). In first experiment, a single mode and highly side-mode suppressed 1.55 m FPLD is achieved by feedback-injecting it with a regenerative EDFA. The linewidth at 3-dB and 10-dB decay and SMSR of 0.016 nm, 0.05 nm and > 49 dB are obtained, respectively. Linear wavelength tuning of up to 6 nm by adjusting FPLD temperature from 10 ℃ to 40 ℃ at just below threshold is reported. In second experiment, a 40-GHz repetitive frequency multiplied optical pulse-train generated from EDFL is demonstrated by seeding a 1-GHz gain-switched modulated FPLD. The pulsewidth and peak power are 10 ps and 5 mW at repetition rate of 40 GHz. The timing jitter of EDFL pulses from 0.6 ps to 10 ps or larger from 1 to 40 GHz repetition rate has been observed. On the same time, the frequency detuning dynamics of a regeneratively amplified EDFL pulse is also achieved. The locking range extends from -13 kHz to +27 kHz. The pulsewidth, peak output power, and phase noise with of the 223th harmonic (996.8635971 MHz) orders of the EDFL fundamental cavity mode are broadening from 34.3 ps to 130 ps, decreasing from 1.8 W to 500 mW, and increasing from — 101.5 dBc/Hz to — 86 dBc/Hz within the locking range. The timing jitter can remain almost unchanged (<0.5 ps) within the positive (<25 kHz) and negatively (<5 kHz) detuning frequency regime. At last, a 42-GHz repetitive rational harmonic mode-locked optical pulse-train generated from EDFL is demonstrated by using a 1-GHz loss-modulated FPLD as an optical mode-locker. The peak power and pulseswidth of rational harmonic mode-locked EDFL pulse are decreased from 35 mW to 14 mW and from 93 ps to 10 ps, respectively.
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