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An accurate, continuously tunable, terahertz synthesizer was proposed by photomixing of two continuous-wave lasers phase-locked to dual optical combs. This synthesizer enables us to perform the precise THz spectroscopy secured by microwave frequency standard.
We report a 1-chip MUX/DEMUX LSI that can handle mixed rate signals at over 10 Gb/s; it is the key technology for future optical access networks that offer highly efficient use of wavelengths in multi-wavelengths systems.
We propose an in-line monitoring technique with visible light by using 1.3 mum-band QPM-LN. We measured 650 nm SH power and Q factor of received data (1.25 Gb/s) to verify the effectiveness of proposed technique.
We present two gigabit/s spectral-amplitude-coding O-CDMA techniques that use coherent multi-frequency light. The techniques achieve high beat-noise tolerance by either employing multi-frequency self-homodyne detection or using spectral M-ary ASK based on electrical-domain spatial-code spreading.
We experimentally demonstrate a 10-Gbit/s coherent QPSK-PON with a reduced bandwidth. Using a linear feed-forward equalizer with an adaptive algorithm, the bandwidth requirement is reduced down to 2.5 GHz with an approximate 0.5-dB power penalty.
We propose a beat-noise-free OCDM technique that enables asynchronous transmission using a simple configuration by applying spectral M-ary ASK based on electrical-domain spatial code spreading. The feasibility is confirmed through a 1.5-Gbit/s transmission experiment.
This paper proposes a novel lambda/bit conversion technique that improves the efficiency of wavelength utilization; it allows multiple optical wavelengths to transfer both optical power and signal information of wavelength combinations, and simultaneous multi optical wavelength reception by a single pin-PD. The proposal can increase the optical received power with highly efficient wavelength utilization;...
We propose a service rate matching optical receiver module for PS-based WDM PON systems that offer maximum bit rates of over 40 Gb/s. Proposed module provides line rate flexibility with low power consumption.
A DWDM-PON is proposed that realizes a spectral efficiency of 1 bit/s/Hz by using homodyne detection based on digital signal processing. The feasibility is confirmed with a transmission experiment, and the application area is discussed.
We propose a flexible optical receiver module for an optical access system that offers not only user/service-multiplexing but also rate-extendibility. Proposed module compensates delays of over 9.6 nsec, caused by GVD, and provides physical rate flexibility.
A 7cc, 8-channel, full-duplex simulaneous operation, multi-rate optical module is proposed for flexible optical access network systems. The proposed module has high-sensitivity berause it offers automatic transimpedance gain and band-pass-filtering.
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