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We demonstrate 32-core dense space-division multiplexed (DSDM) unidirectional transmission of PDM-16QAM 20-WDM signals over 1644.8 km employing a low-crosstalk single-mode heterogeneous 32-core fiber in a partial recirculating-loop system.
We demonstrate 246 μm cladding 6-mode 19-core fiber and realize twice the spatial density of other multi-core fiber with more than 100 channels, while achieving the lowest loss and differential mode delay of 0.33 ns/km.
We propose a technique for measuring properties of cores in a multi-core fibre (MCF) simultaneously by using OTDR and fan-in/out devices. Mode field diameter and relative-index difference of cores in the MCF are successfully estimated by present method.
Fan-in/fan-out device for splicing to 12 core multi-core fiber is fabricated. Maximum loss of 4.7 dB at C-band and the worst crosstalk of −45 dB are confirmed in fan-in and fan-out with 20 m-long MCF.
Multicore EDF for a remotely pumped amplification system over an MCF have been designed and fabricated. The amplification characteristics of the fabricated MC-EDF were confirmed by assembling the MC-EDF as an EDFA.
We report the first low threshold, ultra-small buried heterostructure photonic crystal laser. A very low threshold optical power of 1.5 muW in a butt-jointed InP waveguide and a maximum fiber output of 0.44 muW are achieved.
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