KEYWORDS: Pulse signals, Terahertz radiation, Extremely high frequency, Dispersion, Signal processing, Orthogonal frequency division multiplexing, Free space, Time division multiplexing, Signal generators, Power consumption
We have proposed a new approach for photonic-assisted arbitrary waveform generation in beyond 5G taking advantage of low frequency technology. The generated signals in low frequency technology can be temporally compressed by a chromatic dispersion toward millimeter wave and terahertz band high frequency region. To the best of our knowledge, our recent proposed approach for beyond GHz-class AWG using the MHz-class low-frequency technology with photonic assistance based on chirped pulse compression is first proposed to remodel it to obtain competitive performances in signal frequency, as well as analog resolution, cost, and power consumption. Various use cases in beyond 5G, a large number of signal from massive edge subsystem should be bundled. This requires a signal processing for aggregation of multi-data from vast multi-user information as well as data compression. The data signal is digitally processed for segmentation and tuning so as to accommodate it in the stretched carrier pulse according to the length of signal. Since signals become sparse in beyond-GHz region after signal compression, the produced temporal free space in a frame could be used for accommodation. Such a produced temporal free space can be used for accommodation of overflowing data and users. This requires an additional signal processing for aggregation of multi-data from vast massive user information as well as data compression. In this work, we propose the photonic data aggregation technique for millimeter wave and terahertz band high frequency migration technology for beyond 5G.
For high capacity free space optical (FSO) communication systems, expected be used to support extended coverage for the sixth generation mobile service, the digital coherent technology and wavelength division multiplexing used in optical fiber communications are promising technologies. These technologies can generate optical signals supporting Tb/s level capacity. However, to achieve the link budget required for Tb/s optical links, transmit power in the order of 100 W is required, and achieving 100 W power output with an optical fiber amplifier is challenging. In this work we propose parallel optical amplification of channel groups split out from the WDM signal, instead of amplification of the undivided WDM signal, and the transmission of the amplified signals as separate beams passed through multi-aperture optics. This configuration can reduce the required output power from the individual optical fiber amplifiers. We designed the FSO terminals for the proposed configuration with 3 transmitter apertures, such that the apertures fell within the directivity of the FSO receiver terminal. We evaluated the configuration in an outdoor experiment with a 500 m FSO link and wavelength division multiplexed real-time 100 Gb/s digital coherent QPSK signals. The experimental results show that the proposed configuration can increase the total capacity by 3 times, from 200 Gb/s to 600 Gb/s, without needing to increase the output power from the individual optical fiber amplifiers.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.