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The differential modal gain (DMG) in a few-mode erbium-doped fibre amplifier (FM-EDFA) is successfully improved by employing a ring-core FM erbium-doped fibre (RC-EDF). The DMGs between LP01 and LP11 mode signals in the FM-EDFA with the RC-EDF are 1.8 and 1.6 dB for LP01 and LP11 mode pumping, respectively, whereas those in a FM-EDFA with a conventional step-index FM EDF are 9.2 and 6.1 dB, indicating...
We demonstrate 120.7-Tb/s SDM/WDM unrepeatered transmission over a 204-km 7-core fiber with aggregate spectral efficiency of 53.6 b/s/Hz using a remotely pumped 7-core EDFA and Raman amplification. 17.2-Tb/s (180 × 95.8 Gb/s) PDM-32QAM signals have been transmitted at each core.
We have demonstrated ultrasmall buried heterostructure photonic crystal lasers. Very low threshold optical power in butt-jointed InP waveguide of 1.5 μW and maximum fiber output of 0.44 μW are achieved. High-speed direct modulation (3-dB modulation bandwidth of 5.5 GHz) is also demonstrated at room temperature by optical pumping.
An ultracompact buried heterostructure photonic crystal nanocavity laser exhibits a small energy cost of 8.76 fJ/bit with 20-Gbit/s modulation by optical pumping. The maximum output power in waveguide and the external differential quantum efficiency are -10.3 dBm and 53%, respectively.
We experimentally observed optomechanical response of photonic crystal slabs separated by a thin air gap. Reflectance measurement reveals photonic crystal slabs are mechanically displaced by optical pumping.
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