Kazunori Mukasa

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.

Investigation on multi-core fibers with large Aeff and low micro bending loss

For large Aeff Multi-Core Fibers (MCFs), advantages of using holey fibers as well as effective ways with solid fibers were confirmed. The solid MCFs with Aeff >100 μm2 and suppressed micro bending loss were actually fabricated.

Effective space division multiplexing by Multi-Core Fibers

The minimum fiber diameter of Multi-Core SMF was investigated taking the cladding diameter, core pitch and attenuation loss into account. A way to suppress the failure rate in case of high core density was also discussed.

Multi-core holey fibers for ultra large capacity wide-band transmission

Multi-core holey fibers for the ultra large capacity transmission were investigated numerically and experimentally. Each core can realize the ultra wide band transmission over 550-1700 nm.

Hole assisted fibers (HAFs) and holey fibers (HFs) for short-wavelength applications

HAFs and HFs (MOFs) having unique dispersion properties in near infrared and visible regime will be discussed. In particular, we focus on the dispersion control in a 1.0μm band which have gathered rapidly increasing interests for the aspects of both telecom and non-telecom applications. Furthermore, dispersion shift towards visible wavelengths using a holey fiber technology has tried and the results will be explained. Finally, we will briefly discuss about the potential usage of the MOFs for short wavelength transmission.

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.

Multi-core fibers for large capacity SDM

Developments of multi-core fibers, both solid type and holey type, are introduced. The Space Division Multiplexing will be realized by the multi-core fibers.

Dispersion compensating fiber used as a transmission fiber: inverse/reverse dispersion fiber

This paper gives an overview of IDF/RDF fiber design and development for submarine system. It starts with the concept of dispersion management line and its difference from the conventional DCF used in a module. Then it reviews the fiber design details and optical properties of various types of fibers used as parts of dispersion management lines. Fiber splicing issues using MFD expanding method and a brief summary of transmission experiments using the dispersion management lines are also included. Finally, we discussed a medial dispersion alternative comprising a positive and negative medial dispersion fiber and future optical properties improvements possibilities.

7-core 2-mode fibers with large Aeff to simultaneously realize “3M”

7-core 2-mode fibers with large Aeff of 170μm² (LP01 mode), and 250μm² (LP11 mode) were successfully designed and fabricated. We measured optical properties, and confirmed large Aeff and low cross-talks.

Novel NZ-DSF with ultra-low dispersion slope lower than 0.020 ps/nm/sup 2//km

A novel NZ-DSF with dispersion slope lower than 0.020 ps/nm/sup 2//km and /spl lambda//sub 0/ shorter than 1400 nm has designed and fabricated. The adaptability of a Raman amplifier and dispersion compensator was improved. A BER lower than 10/sup -9/ both in the C- and L-bands was obtained without dispersion compensation.