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We demonstrate the first burst-mode digital coherent transmission necessary for OFDM-PON upstream. The results explicitly show that a burst-mode OFDM transmission can be achieved by using the proposed frame format and a burst-mode coherent receiver.
We propose an unfairness criterion that measures the efficacy of our dynamic-load-balancing(DLB) method for the photonic aggregated Л-tunable WDM/TDM-PON. Simulations show that our DLB method greatly improves fairness in the face of future traffic growth.
We demonstrate the first dynamic load-balancing operation on a symmetric 40-Gbit/s λ-tunable WDM/TDM-PON. Smooth traffic migration without data-frame loss is performed by implementing a DWBA algorithm and a bidirectional hitless λ-tuning sequence within 3 msec.
We propose a wavelength swept discovery process for λ-tunable WDM/TDM-PON systems. The characteristic of this proposed discovery method is the colorless operation which must be supported in NG-PON2. We first demonstrate the proposed discovery process on a λ-tunable WDM/TDM-PON prototype and confirmed its effect. This result realizes the attractive functions of the λ-tunable WDM/TDM-PON system with...
We propose a high-output power λ-selective transmitter utilizing a simple configuration burst-mode booster SOA with gain peak detuning that achieve pattern effect mitigation. We successfully demonstrate over 40-dB loss budget and 40-km reach WDM/TDM-PON.
We propose hitless wavelength-tuning sequence for dynamic wavelength allocation in WDM/TDM-PONs and demonstrate highly frequent wavelength-tunings in 100-ms intervals without data-frame loss using MAC boards. Pay-as-you-grow operation based on the proposed sequence is also shown.
Dynamic SNR management is a promising technique for energy efficient OFDM-PON. We show the first experimental demonstration of the proposed technique. The experiments clarify calculation precision can be reduced according to the optical received power.
This paper proposes a 40 Gbit/s class ??-tunable wavelength division multiplexing and time division multiplexing passive optical network (WDM/TDM-PON) system that uses our newly developed high-output-power ??-selective burst-mode transmitter (B-Tx) in an ONU and a 4 ?? 4 cyclic arrayed waveguide grating as a photonic router. Our developed B-Tx utilizes a booster semiconductor optical amplifier that...
We propose an automatic load-balancing DWBA algorithm for λ-tunable WDM/TDM-PONs. The algorithm is widely applicable despite the use of long-time tuning devices. We have confirmed with simulations that the proposed algorithm properly activates λ-tuning when the load-balancing is needed although the λ-tuning period is much longer than the DBA cycle.
This paper proposes a future optical-access-network concept called the elastic lambda aggregation network. This network will form a common base for providing multiple access services such as residential, business, machine-to-machine, and mobile services.
This paper describes the first demonstration of an energy efficient OFDM-PON using the dynamic SNR management. The controlling calculation precision and modulation format optimizes the DSP energy consumption while satisfying the BER requirements. We realize a 58.7% effective energy efficiency per bit in an FPGA-based receiver experimentally.
We propose a λ-selective burst-mode transceiver with 100-ns wavelength switching for the use in C and L-bands for upstream and downstream signals, respectively. The bidirectional 40-km transmission of symmetric 40-Gbit/s λ-tunable WDM/TDM-PON is demonstrated without a PON repeater.
This paper proposes a wavelength router configuration with large aggregation ratio for lambda (λ)-tunable wavelength-division-multiplexing / time-division-multiplexing passive optical network (WDM/TDM-PON). With this router, the aggregation functions of layer-2 switches (L2SWs) in the conventional access networks are moved into the PON; photonic aggregation. Therefore, L2SWs are no longer required,...
We propose a novel energy-saving technique using variable precision DSP for OFDM-PON. This technique dynamically manages the minimum SNR satisfying the required transmission conditions. We clarify the feasibility of our proposed technique.
We propose a spectrally efficient upstream configuration for WDM-PONs where multi-wavelength channels are demodulated using a single coherent receiver by periodically shifting the local light wavelength. The feasibility is confirmed based on a 2 × 1.5-Gbit/s WDM experiment.
We propose a flexible multiplexing system that assigns bit of symbol in multi-level modulation and time slot dynamically in PON. And we demonstrated successfully a simultaneous downstream scheme for the proposed ONU and GE-PON/10G-EPON ONU.
This paper proposes a 40Gbit/s-class-λ-tunable WDM/TDM-PON for flexible photonic aggregation networks that achieves the aggregation of a large number of users using the DWBA algorithm without an L2-SW. A λ-switching transmission experiment was conducted using a newly developed 40Gbit/s-class fast-switching tunable B-Tx and 4 × 4 cyclic AWG router.
We propose a cyclic N×N AWG router with which to realize a novel λ-tunable WDM/TDM-PON with bandwidth allocation flexibility for inhomogeneous user distribution. We fabricated the router with silica-based PLC technology, and demonstrate that it can cyclically multi/demultiplex both 20 nm-and 200 GHz-spaced signals at 1.3 and 1.5 µm, respectively.
Optical-fiber communication systems have been adopted to deliver video data at high bit rates for professional use. In such professional video delivery systems, each broadcast station needs to edit video data and this requires frequency clock synchronization between broadcast stations. For synchronization, a synchronous network such as ATM (Asynchronous Transfer Mode) was adopted into video delivery...
This paper proposes a 100Gbit/s-class-WDM/TDM-PON system that uses wavelength tunability and DWBA to provide a flexible load balance and enlarged total bandwidth. An experiment of the downstream transmission clarifies the feasibility of the proposed system.
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