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Next-generation radio-access networks will experience excessive handover due to shrinking cell sizes (to support more users) and increasing user mobility. We form Virtual Passive Optical Network (VPON) using mobility-prediction information to reduce handovers in CRAN.
We study an SDN-enabled EPON architecture that utilizes application information from clients to achieve superior upstream resource allocation. This leads to better quality of experience of video-conferencing clients which are high consumers of upstream bandwidth.
In recent years, the increasing traffic demand in radio access networks (RAN) has led to considerable growth of the number of base stations (BS), posing a serious scalability issue with respect to the energy consumption of BSs. Optical-access-enabled Cloud RAN (CRAN) has been recently proposed as a next-generation access network, where the digital unit (DU) of a conventional cell site is separated...
As bandwidth requirements of access networks continue to increase rapidly, especially due to the growth of streaming traffic, the need for resolving bandwidth contention among competing users and applications becomes more compelling. The proposed Software-Defined Ethernet Passive Optical Network (EPON) architecture utilizes an application-level feedback from the client side (for video users) to the...
Radio-over-fiber technique utilized by multiple IF carrier transmission scheme is expected to be a cost-effective solution for next generation mobile fronthaul architecture. We have experimentally investigated and compared multi-IF carrier generation methods based on analog IQ modulation and digital IQ modulation by back-to-back EVM measurement using five 64-QAM-LTE carriers having 20 MHz bandwidth.
We analyze power depletions of DWDM signals caused by a high power OTDR signal in a mobile fronthaul including four optical add/drop nodes in 20 km SMF. We suggest a 1625-nm wavelength or a 1665-nm wavelength as an OTDR signal wavelength to mitigate the stimulated Raman scattering (SRS) induced power depletion of C-band WDM signals.
We analyze the performance of existing E-PON system that support a 64-way split and transmission distance of 50km using a reach extender. We experimentally demonstrated that it can provide a 950 Mbps and 860 Mbps throughputs at a down-/upstream direction.
The 8×10 Gb/s TOSA based on a VCSEL array was successfully developed for NG-PON2 application. For the cost effectiveness, direct optical coupling without lens array was used to package the TOSA. We have found that an optical and electrical crosstalk was small enough not to effect on a transmission performance.
We investigate ONU power leveling methods for mitigating Inter-channel crosstalk of upstream signals in TWDM-PON. 6-dB power dynamic range was archived with maximum 1.4-dB power penalty by adjusting operation current of Tx. The proposed method is thought to be a simple, low-cost solution in comparison with that with a VOA or SOA. Further study is needed for trade-off between crosstalk and eye distortion...
We study real-time energy saving in NG-PON2 systems, i.e., TWDM-PON, and analyze impacts on quality of service and reconfiguration overhead. Our proposed methods are compatible with existing EPON/GPON protocols.
The time-periodic property of the LCD VCOM noise is utilized to reduce the effect of the VCOM noise on the mutual-capacitance measuring touch sensor placed on a LCD panel. The amplitude of the touch sensor driving signal (VSTM) can be reduced reliably down to 0.4 V with the reporting rate of 189 Hz, by using the following two methods. (1) The frequency of VSTM is set to (n+0.5)·fN, by synchronizing...
Real-time energy management in NG-PON2 is studied with impacts on quality of service and reconfiguration overhead quantified. The proposed methods are compatible with existing EPON/GPON protocols.
Generally, electric forklifts are equipped with a controller which works as an inverter that runs on battery power. The controller rotates induction motors for driving and lifting of a forklift. It also manages faults of a forklift: when a truck is under abnormal conditions, the controller is designed to stop the truck by reason of safety. Although most of the faults can be under control, the controller...
This paper presents the 16-channel frame-level gigabit capable PON (GPON) reach extender that can provide a low-cost design, low-power consumption, and high link budget of a legacy GPON with a backward compatibility according to ITU-T G.984.3 standard. The proposed frame-level reach extender performs the signal retiming, wavelength conversion, and upstream burst mode to continuous mode (BM-to-CM)...
A process monitor based on slew-rate measurement has been applied to a body bias control system to detect the process corners and adjust the body bias voltage necessary to meet the power and performance requirements for CMOS circuits. The process monitor consists of N- and P- type slew generators, pulse generator, pulse extender, counter and control circuits. A new analog pulse extender has been developed...
This paper presents the design of a 3.125Gbps CMOS transimpedance amplifier (TIA) with a novel regulated cascode (RGC) preamplifier. The proposed RGC circuit isolates the large input parasitic capacitance and then improves the bandwidth limitation. This TIA was fabricated in 1P6M 0.18um CMOS process and consumes 11.43mA from 1.8V supply voltage. The TIA achieves a gain of 72dBΩ and 2.4GHz bandwidth...
This paper has investigated the enhanced fault-identification method based on the difference of intrinsic properties within an optical fiber. We have verified a fault-identification method using the wavelength dependency of non-reflective events through the experiment.
Significant energy saving is achievable by adapting the number of operating wavelengths to the varying traffic in a reconfigurable WDM-PON deploying passive splitter at the remote node. When dynamic wavelength sharing by ONUs is intelligently planned, the traffic disruption incurred by reconfiguration can be kept at a minimum. Moreover, ONUs need only limited wavelength tunability, in contrast to...
Inter-channel crosstalk impairment of time and wavelength division multiplexing passive optical network is investigated. A method to overcome the crosstalk impairment by controlling ONU transmit signal power is also proposed.
A tunable VCSEL array which has tunability of 50-GHz spaced 16 channels without mode hopping is successfully emonstrated. The tunable laser shows low power consumption for wavelength tuning of 0.01 Wand error-free transmission with 20-km SMF and 64-way splitter.
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