Showing papers by "Yuki Yoshida published in 2011"
TL;DR: 40-Gb/s W-band 16-QAM radio-over-fiber signal is optically synthesized using dual-polarization QPSK modulator and its wireless transmission within FEC limit is demonstrated with optical self-heterodyne detection and digital signal processing.
Abstract: The generation of a 40-Gb/s 16-QAM radio-over-fiber (RoF) signal and its demodulation of the wireless signal transmitted over free space of 30 mm in W-band (75-110 GHz) is demonstrated. The 16-QAM signal is generated by a coherent polarization synthesis method using a dual-polarization QPSK modulator. A combination of the simple RoF generation and the versatile digital receiver technique is suitable for the proposed coherent optical/wireless seamless network.
208 citations
18 Sep 2011
TL;DR: In this article, a 40-Gb/s W-band 16-QAM radio-over-fiber signal is optically synthesized using dual-polarization QPSK modulator.
Abstract: 40-Gb/s W-band 16-QAM radio-over-fiber signal is optically synthesized using dual-polarization QPSK modulator. Its wireless transmission within FEC limit is demonstrated with optical self-heterodyne detection and digital signal processing.
106 citations
TL;DR: Twenty-Gb/s W-band wireless transmission in free space with a distance of 30mm using optical signal generation using Optically synthesized QPSK signal and direct optical upconversion technique for dual purpose of wireline and wireless transmission link is demonstrated.
Abstract: We demonstrate 20-Gb/s W-band wireless transmission in free space with a distance of 30mm using optical signal generation. Optically synthesized QPSK signal and direct optical upconversion technique ease generation of W-band RoF signals for dual purpose of wireline and wireless transmission link. A W-band radio receiver with W-band frequency downconversion and digital signal processing will be applicable for any W-band radio detection.
50 citations
06 Mar 2011
TL;DR: In this paper, a novel all-optical modulation format conversion scheme from on-off-keying to 16 quadrature amplitude modulation using nonlinear optical loop mirror based on parametric amplification and cross-phase modulation in optical fibers was proposed.
Abstract: We propose a novel all-optical modulation format conversion scheme from on-off-keying to 16 quadrature amplitude modulation using nonlinear optical loop mirror based on parametric amplification and cross-phase modulation in optical fibers.
14 citations
03 Nov 2011
TL;DR: In this paper, the PAPR distribution along fiber in optical OFDM systems is studied and the authors reveal that the nonlinearity of the fiber can cause problems in the BER performance and the required dynamic range of the receiver.
Abstract: This paper studies the PAPR distribution along fiber in optical OFDM systems and reveals the PAPR enhancement phenomenon due to the fiber nonlinearity, which causes problems in the BER performance and the required dynamic range of the receiver.
6 citations
TL;DR: A tripodal complex was used to synthesize coordination polymers as mentioned in this paper, which can be used as bidentate, tridentate or tetradentate bridging units.
Abstract: A tripodal complex [CuCl(tpmtm)] (tpmtm: tris(2-pyrimidylthio)methanide) is used to synthesize coordination polymers. The tripodal complex unit worked as bidentate, tridentate, or tetradentate brid...
5 citations
Proceedings Article•
04 Jul 2011TL;DR: In this paper, the authors present new IFDMA-based PON systems employing a low power SRAM-based DSP circuits for over 10 Gb/s-capable PON.
Abstract: We present new IFDMA-based PON systems employing a low power SRAM-based DSP circuits for over 10 Gb/s-capable PON. Its power reduction effect of more than 93 % compared to FFT/IFFT-based OFDMA-PON systems was demonstrated in real circuits on FPGA.
4 citations
Proceedings Article•
04 Jul 2011TL;DR: This paper presents and evaluates the architecture of subcarrier multiple access PON systems applying remote inter-carrier synchronization scheme over the ONUs to realize efficient batch processed subcarriers demodulation at the OLT on PON uplinks.
Abstract: This paper presents and evaluates the architecture of subcarrier multiple access PON systems applying remote inter-carrier synchronization scheme over the ONUs to realize efficient batch processed subcarrier demodulation at the OLT on PON uplinks.
3 citations
01 Dec 2011
TL;DR: In this paper, a 10-Gb/s/ch frequency division multiplexing (FDM) radio-over-fiber (RoF) signal generation and free-space transmission in W-band (75-110 GHz) was successfully demonstrated.
Abstract: 10-Gb/s/ch frequency-division-multiplexing (FDM) radio-over-fiber (RoF) signal generation and free-space transmission in W-band (75–110 GHz) are successfully demonstrated. The FDM quadrature-phaseshift-keying (QPSK) signals with 3 channels are optically generated and transmitted over 30-cm radio link. Digital signal processing with W-band mixer realizes successful demodulation of its FDM radio signal.
1 citations