Abstract
The increased bandwidth demand has motivated the exploration of fiber-wireless integration (FWI) for future broadband 5G+ cellular communication networks. FWI offers ultra-wideband (UWB) wireless delivery with low interference, which will be prospective for 5G/5G+ mobile communication wireless access, military application, disaster emergency communication, broadband communication at home, and so on. As an effective carrier, millimeter-wave (mm-wave) frequencies between 30 GHz and 300 GHz are a new frontier for FWI that offers the promise of orders of magnitude greater bandwidths. In this paper, we summarize all kinds of enabling technologies for FWI, including the photonic vector mm-wave generation scheme, the integration of various multi-dimensional multiplexing techniques, radio-frequency-transparent (RF-transparent) photonic demodulation technology for fiber-wireless-fiber network, and low-complexity high-efficiency digital signal processing (DSP). Based on DSP for UWB high-spectrum-efficiency signal coherent detection, we have made great progress in the field of the mm-wave-band (from Q- to D-band) broadband signal generation and long-distance transmission. These experimental results show that FWI with large-capacity, long-distance, and high-spectrum-efficiency has important scientific and practical significance for the development of the future 5G+ wireless communication.
Highlights
The fiber-wireless integration access system effectively integrates the advantages of optical fiber communication in terms of communication bandwidth and transmission distance as well as the advantages of wireless communication in terms of mobility and seamless coverage.[57,58,59,60,61,62,63,64,65,66,67,68,69] It is a significant development trend of future broadband access networks
Advanced digital signal processing (DSP) technology can be further applied to the fiber-wireless integration access system to effectively compensate for various kinds of linear and nonlinear impairments caused by fiber-wireless integration transmission links and to achieve high-spectrum-efficiency high-receiver-sensitivity fiber-wireless integration transmission.[79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101]
Fiber-wireless integration can possess the advantages of both fiber and wireless transmission, in particular, the large bandwidth of fiber and ultra-wide bandwidth in the mm-wave
Summary
Photonics-aided millimeter-wave (mm-wave) technology came into being and has been intensively investigated.[42,43,44,45,46,47,48,49,50,51,52,53,54,55,56]. 111101-4 Yu, Li, and Zhou high-definition video and data signal transmission.[9] In the same year, Wang et al put forward a high-speed indoor fiber-wireless integration access communication system based on wavelength division multiplexing (WDM), which can provide flexible bandwidth allocation according to different application requirements.[10] In 2012, Lim et al put forward a fiber-wireless integration access network combined with Fiber to the Home (FTTH) and promoted a new idea of the future LongTerm-Evolution (LTE) fiber-wireless integration access In this new architecture, the new regional assignment plays an important role in the promotion of future access capacity.[11] Kellerer et al put forward a dynamic allocation structure for the fiber-wireless-integration signal, adopting a reconfigurable SOA array for RF channel routing, and their experiment verified the feasibility of the architecture.[12] In the same year, Ho et al proposed a 60-GHz fiber-wireless integration access system based on orthogonal frequency division multiplexing (OFDM) and multiple-input multipleoutput (MIMO) and achieved a corresponding experimental demonstration with 50-Gb/s data rate and 8-bit s−1 Hz−1 spectrum efficiency.[14] Shao et al proposed a 60-GHz fiber-wireless integration access structure integrated with the WDM passive-optical-network (WDM-PON) using a single Mach-Zehnder modulator (MZM) to implement parallel phase modulation and the system can be compatible with the ECMA387 standard mm-wave and 2.5-Gb/s baseband signal. The Military Strategy and Tactical Relay (Milstar) satellite system and Advanced Extremely High Frequency (AEHF) satellite system of the United States are the typical representatives of the Q/V-band satellite communication systems; the digital audio-video interactive distribution-data collection experiment (DAVID-DCE) and the W-band analysis and evaluation (WAVE) carried out by the Italian Space Agency (ASI) are the typical representatives of the W-band satellite communication systems.[104,105,106] In addition, the Quasi-Zenith Satellite System (QZSS) project of the Japan Aerospace Exploration Agency (JAXA) recommended to use 84 GHz and 74 GHz as the carrier frequencies of the uplink and downlink, respectively, and it can provide good transmission performance for urban mobile telecommunications services.[107]
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