Ryo Miyabe

Amplification characteristics of a multi-core erbium-doped fiber amplifier

A multi-core erbium-doped fiber amplifier with three cores was demonstrated. By utilizing MC-EDF with low cross-talk of -30dB, two 10-Gbit/s signals were simultaneously amplified with gain of 15dB and power penalty of less than 1dB.

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.

Hole-Assisted Fibers With

Microstructured optical fibers (MOFs) with air holes within the structure, such as hole-assisted fibers (HAFs) and holey fibers (HFs), having unique dispersion properties in short-wavelength bands, have captured considerable attention recently thanks to their wide range of practical applications. In particular, supercontinuum (SC) source, which is generated by interplay between many different nonlinear processes occurred in the MOFs, have gathered huge interests both in telecom and nontelecom applications. In this paper, designs and fabrications of HAFs and HFs, having unique dispersion properties in near infrared and visible regime, will be discussed. In particular, we focus on: 1) the dispersion control of HAFs in the 1.0- mum band, which has become of great interest stimulated by maturing ytterbium-doped fiber amplifier (YDFA) technologies, and 2) dispersion shift towards visible wavelengths (500 nm) using HFs. Finally, we will briefly discuss future developments of the MOFs for short-wavelength applications.

\lambda _{0}

We develop a hole-assisted fiber with large anomalous dispersion and low macro-bending loss to realize compact module of CPF pulse compressor. Using the fabricated module, we demonstrate C-band wavelength-tunable pulse compression for 40 GHz pulse train

Around 1000 nm and Holey Fibers With

We designed and fabricated the single-mode HAFs having zero dispersion in the 1.0 mum band. By optimizing the profile of the HAFs, we successfully widen a usable wavelength range towards a 1.0 mum band.

\lambda _{0}

We designed and fabricated simple-structure HAFs having lambda0 in a 1.0 mum band as well as low confinement loss and single mode operation over wide range of wavelengths. The developed HAFs showed high non-linearity and good connectivity.