Abstract
We demonstrate an efficient ring-cavity E-band bismuth-doped fiber laser with a low threshold power. The laser output power and efficiency are optimized for two operating wavelengths near the luminescence peak, 1430 nm and 1437.6 nm, by experimentally changing the laser output coupling ratio. Using a single co-propagating 1320 nm laser diode pump and a 100 m long bismuth-doped fiber, we achieve an output power of 114 mW with a slope efficiency of 24.5 % and an OSNR of 64 dB for an optimal coupling ratio of 70 % for a pump threshold below 64 mW. With added spectral tunability, this fiber laser will find application forthe characterization of E-band devices and components, such as optical amplifiers, and experimentation in transmission systems.
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