Hirohito Hokazono

First Demonstration of gas sensing using silica high-mesa waveguide

We demonstrate gas sensing using silica high-mesa waveguide for the first time. A 4.5cm length waveguide show CO2 sensing at a wavelength of λ=1572nm with rapid sensing speed of below 15μs successfully.

Gas Sensing Demonstration by Using Silica High-Mesa Waveguide with Amplified Cavity Ring Down Spectroscopy Technique

For realizing compact breath sensing device, we have proposed a silica high-mesa waveguide for the gas-cell (breath detection part) because of its low propagation loss. It is, however, still difficult to make breath-sensing due to its total insertion loss because the required length of the waveguide reaches very long of approximately several 10 cm–1m for the small portion of gas, and thus gas-sensing has not been achieved so far. To compensate the insertion loss, we utilize “amplified” CRDS (cavity ring down spectroscopy) technique to realize gas-sensing in this paper. As a result, we could successfully confirm the gas-sensing of CO2 with using the waveguide gas-cell for the first time.

Advanced OAM Mode Scheme for Transmission Channel Enhancement of Over N on N-core MCF Toward 100 ch

We propose “advanced OAM” mode on N-core MCF. The estimated results show the possibility of approximately 2 times enhancement of the transmission channel on N-core MCF.

Proposal of multiple slot silica high-mesa waveguide for infrared absorption

We propose multiple slot silica high-mesa waveguide for infrared absorption, due to its possibility of realizing high portion of optical field out of the waveguide. It shows high portion of optical field out of the waveguide of 20.3%for fourfold structure at the wavelength of 1550nm.