Tomoya Shimizu

Single-mode hole-assisted fiber with low bending loss characteristics

We review the design and transmission characteristics of hole-assisted fiber (HAF) as a candidate for bending loss insensitive fiber (BIF). We also investigate the applicability of single-mode and hole-assisted type BIF to future access networks.

Visible to Infrared WDM Transmission over PCF

We achieved the first I Gbit/s visible transmission over a 1 km PCF. We succeeded in ultra-wide WDM transmission using 6 wavelengths from 658 to 1556 nm, which corresponds to a bandwidth of 263 THz.

Relationship between optical wiring conditions and MPI degradation

Optical wiring conditions are investigated numerically and experimentally with a viewpoint of MPI induced transmission performance degradation. We reveal the impact of the interval of the bending portion on MPI degradation for the first time.

MPI characteristics of HAF based optical cord with MFD unmatched launching and impact of sweep fusion splicing

Single-mode hole-assisted-fibre (HAF) based optical cord reveals no multipath interference (MPI) degradation independent of the existence of a mode-field diameter mismatch. Moreover, sweep fusion splicing effectively reduces MPI even if the HAF has extremely strong confinement.

Multi-Band Mode Filter for Shorter Wavelength Region Transmission over Conventional SMF

A coupler type mode filter (MF) is proposed that provides higher order mode reduction at both 780 and 850 nm. A 10 Gbit/s, 870 m long transmission is demonstrated over a SMF by using the MF.

Holey fibers for low bend loss

Abstract Bending-loss insensitive fiber (BIF) has proved an essential medium for constructing the current fiber to the home (FTTH) network. By contrast, the progress that has been made on holey fiber (HF) technologies provides us with novel possibilities including non-telecom applications. In this paper, we review recent progress on hole-assisted type BIF. A simple design consideration is overviewed. We then describe some of the properties of HAF including its mechanical reliability. Finally, we introduce some applications of HAF including to high power transmission. We show that HAF with a low bending loss has the potential for use in various future optical technologies as well as in the optical communication network.