Noriki Miki

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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.
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.
In order to relax the limitation of the number of multiplexed signal lights caused by beat noise between signal lights, we investigate the applicability of a heterodyne detection technique to a spectral amplitude coding optical code division multiple access scheme. In this investigation, for the first time, we found analytically that the optical frequency(More)
This paper reports a novel cost-effective multiwavelength optical source for OCDM. This source has a simple configuration and emits well-flattened light with a precisely controlled wavelength spacing by using a directly sinusoidally modulated laser diode technique. The flattened multiwavelength light generation is analytically evaluated by using a small(More)
We propose a maximum likelihood detection (MLD) technique that incorporates beat noise estimation (BNE). MLD can minimize a bit error rate theoretically because a bit pattern with the maximum posteriori probability is selected as the detected signals. Also, BNE can extract a specific beat noise from mixed multiple signals using a correlation. By combining(More)
We propose frequency-domain OCDM employing BPSK in addition to multi-level ASK based on electrical-domain spatial code spreading. With BPSK, scalability is enhanced while maintaining a practical configuration owing to self-homodyne detection. Feasibility is confirmed experimentally at 3 user × 1.5 Gbit/s.
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.