Abstract
An amplified and narrow-linewidth distributed feedback fiber laser in a master oscillator power amplifier (MOPA) configuration is presented. It consists of a distributed feedback fiber laser as the seed laser and an MOPA structure in an all-single-mode fiber system. The optimized narrow-linewidth fiber laser has an over 15% efficient slope. The packaged laser module shows excellent performance including a narrow linewidth of 2 kHz, low relative intensity noise below 100 dB/Hz at the relaxation oscillation frequency, and low phase noise, which make it very suitable for interference and distributed sensing applications.
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