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This paper explores different functionalities that can be implemented directly over the optical layer, paving the way for the future for converged wireless and wired services optical networks. Wireless technologies operating over optical networks mainly employ radio-over-fiber (RoF) technologies, which effectively help to manipulate microwave and(More)
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(More)
Multi-input multi-output (MIMO) transmission of two millimeter-wave radio signals seamlessly converted from polarization-division-multiplexed quadrature-phase-shift-keying optical signals is successfully demonstrated, where a radio access unit basically consisting of only optical-to-electrical converters and a radio receiver performs total signal(More)
— We demonstrate a full-duplex WDM millimeter-wave-band radio-on-fiber (RoF) system using a supercontinuum (SC) light source. For downlink transmission, the periodic nature of arrayed waveguide grating, where the period is free spectral range, is used for utilizing the full bandwidth of the SC light source. Half of the SC output modes are used for uplink(More)
We propose a demultiplexing scheme for a DWDM mm-wave fiber-radio system by optical frequency interleaving. The scheme consists of a Fabry-Perot etalon, an optical circulator and a 2 x N arrayed-waveguide grating, which is designed to steer the input signals with the frequency difference equals to the millimeter-wave carrier frequency into the same output(More)
In this article, we propose a concept of an "adaptable access system" as future access system architecture. First, current issues and trends in communications networks are shown from various points of view, to discuss essential items for a future access system. Next, to set the basic direction of research and development for physical network infrastructure,(More)
SUMMARY We propose a coherent optical and radio seamless network concept that allows broadband access without deployment of additional optical fibers within an optical fiber dead zone while enhancing network resilience to disasters. Recently developed radio-over-fiber (RoF) and digital coherent detection technologies can seamlessly convert between optical(More)