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Koji YAMADA Tai TSUCHIZAWA Toshifumi WATANABE Jun-ichi TAKAHASHI Emi TAMECHIKA Mitsutoshi TAKAHASHI Shingo UCHIYAMA Hiroshi FUKUDA Tetsufumi SHOJI Sei-ichi ITABASHI Hirofumi MORITA
A silicon (Si) wire waveguiding system fabricated on silicon-on-insulator (SOI) substrates is one of the most promising platforms for highly-integrated, ultra-small optical circuits, or microphotonics devices. The cross-section of the waveguide's core is about 300-nm-square, and the minimum bending radius are a few micrometers. Recently, crucial problems involving propagation losses and in coupling with external circuits have been resolved. Functional devices using silicon wire waveguides are now being tested. In this paper, we describe our recent progress and future prospects on the microphotonics devices based on the silicon-wire waveguiding system.
Rai KOU Sungbong PARK Tai TSUCHIZAWA Hiroshi FUKUDA Hidetaka NISHI Hiroyuki SHINOJIMA Koji YAMADA
We demonstrate phase demodulation of 10-Gbps DPSK signals using a silicon micro-ring resonator with a radius of 10 µm and with various coupling gaps for light of ∼1550 nm in wavelength. Influence of the Q factors and transmissions of the resonators on the response speed and power balance of the two output ports is discussed. Furthermore, temperature sensitivity on resonance peak was measured and we discuss its effect on practical demodulation application.
Mizuki IWANAMI Hiroshi FUKUDA Manabu KUSUMOTO Takashi HARADA
This paper shows experimental results of packet error rates (PERs) in wireless-LAN mounted printed circuit boards and gives a discussion on a mechanism of electromagnetic noise coupling that affects the PER. We utilized the amplitude probability distribution to investigate the noise coupling channel. We measured the magnetic near-field distribution to obtain information about noise sources. Based on measurement results, we also performed parallel plate resonance analysis to find out electromagnetic interference antennas. We confirmed that noise radiates from a power supply system of a digital circuit and its coupling to a receiving antenna causes an increase of the PER.