Advanced optical access technologies for next-generation (5G) mobile networks [Invited]

Zou, Jim; Sasu, Silviu Adrian; Lawin, Mirko; Dochhan, Annika; Elbers, Jörg-Peter; Eiselt, Michael

doi:10.1364/jocn.391033

Cited by 66 publications

(28 citation statements)

References 14 publications

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“…− → m Q (t) = 2A(t) cos(ω RF t + ϕ(t)) sin(ω LO t + θ) = A(t) sin(ϕ(t) − θ) (13) where ω LO is the frequency of the LO. Here we assume that the receiver is homodyne, ω LO = ω RF .…”

Section: Requirement Of Phase Noisementioning

confidence: 99%

Optoelectronic oscillator for 5G wireless networks and beyond

Zou

Yang

et al. 2021

J. Phys. D: Appl. Phys.

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With the development of 5G wireless network and beyond, the wireless carrier frequency will definitely reach millimeter-wave (mm-wave) and even terahertz (THz). As one of the key elements in wireless networks, the local oscillator (LO) needs to operate at mm-wave and THz band with lower phase noise, which becomes a major challenge for commercial LOs. In this article, we investigate the recent developments of the electronic integrated circuit (EIC) oscillator and the optoelectronic oscillator (OEO), and especially investigate the prospect of OEO serving as a qualified LO in the 5G wireless network and beyond. Both the EIC oscillators and OEOs are investigated, including their basic theories of operation, representative techniques and some milestones in applications. Then, we compare the performances between the EIC oscillators and the OEOs in terms of frequency accuracy, phase noise, power consumption and cost. After describing the specific requirements of LO based on the standard of 5G and 6G wireless communication systems, we introduce an injection-locked OEO architecture which can be implemented to distribute and synchronize LOs. The OEO has better phase noise performance at high frequency, which is greatly desired for LO in 5G wireless network and beyond. Besides, the OEO provides an easy and low-loss method to distribute and synchronize mm-wave and THz LOs. Thanks to photonic integrated circuit development, the power consumption and cost

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Section: Requirement Of Phase Noisementioning

confidence: 99%

Optoelectronic oscillator for 5G wireless networks and beyond

Zou

Yang

et al. 2021

J. Phys. D: Appl. Phys.

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“…Compared with the traditional distributed radio access network (D-RAN), the distributed units (DUs) are placed at one central office and the corresponding distance from active antenna unit (AAU) to DU is extended to 10 km for the main scenario of 5G C-RAN front-haul network. In this centralized scenario, wavelength division multiplexing (WDM) technology would be introduced between AAU and DU to save optical fibers [8]. Thus, with the extended transmission distance and WDM equipments, operation, administration and maintenance (OAM) functions are crucial for front-haul transport network to process the optical link failures and satisfy the reliability requirements of 5G services [9].…”

Section: Introductionmentioning

confidence: 99%

Semi-Active Wavelength Division Multiplexing System Based on Pilot-Tone Relay Detection for 5G Centralized Front-Haul Network

Wang

Zhang

et al. 2021

IEEE Access

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A semi-active wavelength division multiplexing (WDM) system based on pilot-tone relay detection is proposed and experimentally demonstrated for 5G centralized front-haul network, which is composed of a passive WDM multiplexer at active antenna unit (AAU) side, an active WDM equipment at distributed unit (DU) side, and several WDM optical modules in AAU and DU, respectively. In this semiactive WDM scheme, WDM technology is applied as an optical transport layer to save fibers and the semiactive architecture based on pilot-tone modulation is capable of flexible deployment with lite operation, administration and maintenance (OAM) functions. The experimental results show that the sensitivity penalty is lower than 0.3 dB and the extinction ratio is still higher than 4.2 dB by using 4 % amplitude depth of pilot-tone modulation. The bit rate of the OAM signal is 1024 bps to reuse the existing microcontroller unit in the optical modules for generating and detecting OAM signals. The robustness of the pilot-tone signals is further demonstrated as the sensitivities of the 25-Gbps eCPRI signals and the 1024-bps OAM signals are -16 dBm and -23 dBm, respectively. Compared with the OAM demodulation both in upstream and downstream direction for the active WDM equipment, the number of OAM demodulation unit can be reduced by 50% and the sensitivity requirement of OAM demodulation can be improved by 11.5 dB by using only downstream OAM demodulation unit. Error-free 24-hour transmission of real-time 12-channel 25-Gbps eCPRI signals combined with 1024-bps pilot-tone OAM signals over 10-km single mode fiber is obtained.

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“…Furthermore, additional DSPs may also be essential for further improving achieving flexible numerology, excellent channel bandwidth elasticity, channel count-independent performance, excellent adaptability to transmission system impairments and transparency to flexible RAN low layer splits. Given the fact that intensity modulation and direct detection (IMDD) passive optical networks (PONs) are promising for cost-effectively providing broadband connectivity for MFHs [16], [17], to solve the aforementioned technical challenges, hybrid single sideband (SSB) OFDM-digital filter multiple access (DFMA) PONs based on IMDD [18] have been reported, where . Ffor upstream communications, multiple gapless SSB OFDM signals produced without performing the Hilbert transform operations are passively combined in the remote node, and simultaneously separated and demodulated by a single FFT operation in the OLT without performing the matching filtering operation.…”

Section: Introductionmentioning

confidence: 99%

Concurrent Inter-ONU Communications for Next Generation Mobile Fronthauls based on IMDD Hybrid SSB OFDM-DFMA PONs

Zhong¹,

Jin²,

Jiang³

et al. 2021

J. Lightwave Technol.

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In PON-based mobile fronthauls, direct inter-ONU communications without passing end-user traffic to the OLT offer a promising solution for fulfilling thethe stringent latency and bandwidth requirements of of 5G and beyond networks. In this paper, with slight modifications to at the PON remote node, a concurrent inter-ONU and upstream communication technique is proposed and experimentally demonstrated in 101.6Gbit/s multipoint-to-point hybrid SSB OFDM -digital filter multiple access (DFMA) IMDD PONs over at a distance of 25km SSMFs. Multiple gapless inter-ONU and upstream SSB signals are aggregated by digital orthogonal filtering in each ONU transmitter. A single FFT operation is applied for demultiplex and demodulation in the OLT/ONU receivers. The results show that for both the inter-ONU and upstream transmissions, the optimum length of optimal digital filters is is 32, based on which the power penalties due to the fiber transmission and ONU channel interference are <1dB and <2dB, respectively. For the inter-ONU communications, adaptive RF spectral assignments can effectively mitigate the Rayleigh and Brillouin backscattering effects and the upstream channel fading effect, thus giving rise to >30% improvements in aggregated signal transmission capacity. In addition, detailed experimental investigations are also undertaken of the trade-off between differential ONU optical launch power dynamic range and aggregated signal transmission capacity. An approximately 1dB increase in ONU launch power dynamic range is achievable by reducing the aggregated signal transmission capacity by 5Gbit/s.

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Advanced optical access technologies for next-generation (5G) mobile networks [Invited]

Cited by 66 publications

References 14 publications

Optoelectronic oscillator for 5G wireless networks and beyond

Optoelectronic oscillator for 5G wireless networks and beyond

Semi-Active Wavelength Division Multiplexing System Based on Pilot-Tone Relay Detection for 5G Centralized Front-Haul Network

Concurrent Inter-ONU Communications for Next Generation Mobile Fronthauls based on IMDD Hybrid SSB OFDM-DFMA PONs

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