Abstract:A full-duplex fiber-to-the-X (FTTX)/radio-over-fiber (ROF) transport system based on a broadband amplified spontaneous emission (ASE) light source is proposed and demonstrated for rural wide-spread villages. Combining the concepts of long-transmission transmission and ring topology, a long-haul single-mode fiber (SMF) trunk is sharing with multiple rural villages. Externally modulated baseband (BB) (1.25 Gbps) and radio-frequency (RF) (622 Mbps/10 GHz) signals are successfully transmitted simultaneously. Good … Show more
“…Given that the 24.5 GHz is located at the resonance peak, the drop in the middle frequencies will not affect the transmission performances. Since the transmission rate is times the bandwidth 29,30 , yet a 128 Gb/s fibre-FSO integration [24.5 ×× 2 (VSB-PAM4 modulation) × 2 (PDM operation) > 128] can be satisfactorily implemented.Figure 1( a ) P–I curve of the 1.55-μm VCSEL with a threshold current of 2.3 mA and a slope of around 26 mW/mA. ( b ) The modulation responses of the free-running VCSEL under different driving currents and the modulation response of the VCSEL with an injection locking scheme.…”
A polarization-division-multiplexing (PDM)-based bi-directional fibre-free-space optical (FSO) integration with two reflective semiconductor optical amplifiers (RSOAs) scheme to efficiently wipe off the modulated data for upstream modulation is proposed and successfully demonstrated. For downstream modulation, a high-speed 128 Gb/s vestigial sideband (VSB)-four-level pulse amplitude modulation (PAM4) fibre-FSO integration is feasibly established. The transmission capacity is increased up to four times through PDM operation and VSB-PAM4 modulation. For uplink transmission, a 10 Gb/s non-return-to-zero fibre-FSO integration with two RSOAs scheme to effectually erase the downstream modulated data is practically constructed. The upstream performance exhibits noticeable enhancement by using of two RSOAs scheme to wipe off the modulated data clearly. Such illustrated PDM-based bi-directional 128 Gb/s (downstream)/10 Gb/s (upstream) fibre-FSO integration is shown to be prominent not only due to its enhancement in the convergence of fibre backhaul and optical wireless reach extender but also because of its benefit in bi-directional transmission for affording high transmission capacity with long-reach optical wireless link and improved upstream performance.
“…Given that the 24.5 GHz is located at the resonance peak, the drop in the middle frequencies will not affect the transmission performances. Since the transmission rate is times the bandwidth 29,30 , yet a 128 Gb/s fibre-FSO integration [24.5 ×× 2 (VSB-PAM4 modulation) × 2 (PDM operation) > 128] can be satisfactorily implemented.Figure 1( a ) P–I curve of the 1.55-μm VCSEL with a threshold current of 2.3 mA and a slope of around 26 mW/mA. ( b ) The modulation responses of the free-running VCSEL under different driving currents and the modulation response of the VCSEL with an injection locking scheme.…”
A polarization-division-multiplexing (PDM)-based bi-directional fibre-free-space optical (FSO) integration with two reflective semiconductor optical amplifiers (RSOAs) scheme to efficiently wipe off the modulated data for upstream modulation is proposed and successfully demonstrated. For downstream modulation, a high-speed 128 Gb/s vestigial sideband (VSB)-four-level pulse amplitude modulation (PAM4) fibre-FSO integration is feasibly established. The transmission capacity is increased up to four times through PDM operation and VSB-PAM4 modulation. For uplink transmission, a 10 Gb/s non-return-to-zero fibre-FSO integration with two RSOAs scheme to effectually erase the downstream modulated data is practically constructed. The upstream performance exhibits noticeable enhancement by using of two RSOAs scheme to wipe off the modulated data clearly. Such illustrated PDM-based bi-directional 128 Gb/s (downstream)/10 Gb/s (upstream) fibre-FSO integration is shown to be prominent not only due to its enhancement in the convergence of fibre backhaul and optical wireless reach extender but also because of its benefit in bi-directional transmission for affording high transmission capacity with long-reach optical wireless link and improved upstream performance.
“…Spectrum slicing is a feasible technique by which narrow wavelengths are filtered from a BLS and externally modulated to deliver optical signals. It is attractive because it avoids the need of multiple distributed feedback (DFB) laser diodes (LDs) with selected wavelengths [11]. Fig.…”
This paper proposes and presents the experimental demonstration of 320-Gb/s free-space optical (FSO) communication based on dense-wavelength-division-multiplexing (DWDM) technology and afocal scheme. To the best of our knowledge, this is the first one that adopts DWDM technology and afocal scheme to successfully demonstrate 50-m/320-Gb/s FSO communication. Results show that the free-space transmission distance is greatly increased by the afocal scheme and that the free-space transmission rate is significantly enhanced by the DWDM technology. DWDM FSO communication over a 50-m free-space link with a total transmission rate of 320 Gb/s ð40 Gb/s= Â 8 ¼ 320 Gb/sÞ is achieved. With the aid of a low-noise amplifier and clock/data recovery at the receiving site, good bit-error-rate (BER) performance and clear eye diagram are obtained at a 50-m/320-Gb/s operation. Such 50-m/320-Gb/s DWDM FSO communication provides the advantages of optical wireless communications for long transmission distance and high transmission rate, which is thoroughly useful for long-haul and high-speed light-based WiFi (LiFi) applications.
“…[1][2][3][4][5] Radio over fiber (RoF) system plays an important role in providing stable wire services and maneuverable wireless connections. [6][7][8][9] At present, millimeter-wave RoF link can directly cover the current optical and wireless networks for the access network fusing 5G. 10,11 Therefore, the integration of RoF system and PON has become an appealing candidate for realizing highspeed and high-capacity communication networks.…”
Section: Introductionmentioning
confidence: 99%
“…Combining wireless with optical fiber to achieve a novel system has been regarded as a viable approach for mobile communication 1‐5 . Radio over fiber (RoF) system plays an important role in providing stable wire services and maneuverable wireless connections 6‐9 . At present, millimeter‐wave RoF link can directly cover the current optical and wireless networks for the access network fusing 5G 10,11 .…”
We propose a hybrid full duplex passive optical network with fusion of wavelength‐division‐multiplexing and orthogonal frequency‐division multiplexing (WDM‐OFDM) for a radio‐over‐fiber (RoF) system application. The key of the system is a tunable optical frequency comb (OFC) embedded cascading modulators and a parameter mixer. Moreover, 23 frequency components with 0.6 dB flatness generated by the OFC are used as light sources for each WDM channel. We utilize a 7.5 GHz OFDM wired signal and a 12.5 GHz OFDM wireless signal for downstream transmission and 10 Gb/s OOK (on–off keyed) signals for upstream traffic. Using polarization multiplexing technique, we extract a central optical carrier to bear the upstream signal so that no excess optical source is introduced into the ONU. Thus, the intricacy and costs of system are diminished. Moreover, successful transmission has been demonstrated since the bit error rates of the downstream and upstream signals are always under the adopted forward error correction limit. Furthermore, the proposed system can enhance power budget and reduce cost, which has a promising prospect for future wireless communication.
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