Mutual injection locking of a fiber-pigtailed Fabry–Perot laser diode (FPLD) and a closed-loop erbium-doped fiber-amplifier-based laser (EDFL) system are studied. A single FPLD longitudinal mode can be lasing in the EDFL–FPLD link, with a reduced linewidth of <0.017nm and an improved sidemode-suppressing ratio of 50 dB. The FPLD’s optimized current range is below threshold within 10%, and its required feedback-injecting power is 12.4µW (corresponding to 0.03% of the EDFL output power). The maximum detuning ranges of the current and temperature of the FPLD that preserve the narrow linewidth and the highest sidemode-suppressing ratio of the EDFL–FPLD link are 2.4 mA and 2.2 °C, respectively. The power dissipated by the EDFL–FPLD link is 20% more than that of the free-running EDFL.

© 2003 Optical Society of America

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