Harumi Inaba

19-core fiber transmission of 19×100×172-Gb/s SDM-WDM-PDM-QPSK signals at 305Tb/s

A novel free-space coupling system combined with a multi-core fiber enables up-scaling to a record space-division-multiplexed (SDM) channel number of 19. We achieve 305-Tb/s transmission over 10.1 km using 19-SDM, 100-WDM PDM-QPSK signals.

305 Tb/s Space Division Multiplexed Transmission Using Homogeneous 19-Core Fiber

We report record capacity data transmission at 305 Tb/s over 10.1 km, using space division multiplexing (SDM) with 19 channels. To realize such a large SDM channel number, we fabricated a trench-assisted homogeneous 19-core fiber with average intercore crosstalk of about -32 dB at 1550 nm. We also fabricated a 19-channel SDM multiplexer/demultiplexer using free-space optics with low insertion losses and low additional crosstalk. The data signal transmitted through each SDM channel was 100 wavelength division multiplexing (100 GHz spacing) 2 × 86 Gb/s polarization-division-multiplexed quadrature phase shift keying signals and the spectral efficiency was 30.5 b/s/Hz.

19-core multi core fiber to realize high density space division multiplexing transmission

19-core multi core fiber which has 10 times higher core density than 250μm coated SMF was realized. Each core was located on the three layered hexagonal grid in the 200μm cladding keeping low crosstalk properties.

Weakly coupled multi core fibers with optimum design to realize selectively excitation of individual super-modes

A design of the weakly coupled 7 core fibers was optimized for the mode division multiplexing transmission. By localizing super-modes, high spatial density would be successfully realized with simple setup utilizing the multi core connectors.

Bend insensitive small diameter fibers for optical interconnection systems

Bending loss insensitive small diameter fibers for optical interconnection systems using 1100 nm high-speed VCSELs are designed and fabricated. 90°-bending with 1 mm radius is achieved by fabricated 80 μm cladding fibers using stress-free bending technique.

Benefits and applications of smaller diameter fibers

Recently, smaller diameter fibers have been investigated for flexible wiring and compact packaging. This paper summarizes the attributes of smaller diameter fibers. Applications of these fibers are also introduced in this report.