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We demonstrated a 2µm switchable, tunable and power-controllable dual-wavelength fiber laser by adjusting the center wavelengths of FBGs and the cavity losses, respectively. The topology is based on the parallel connection of FBGs using 3×3coupler.
Optical switching technologies have been attracting much attention because of the potential to save the cost and energy consumption. However, optical switching technologies have not been extensively used in the networks so far, while optical transmission technologies have been deployed widely. This paper figures out that the energy consumption of communication networks is going to rapidly increase...
We propose a dual-polarization signal-carrier interleaved direct detection (DP-SCI-DD) scheme to achieve 100% spectrum efficiency with reference to single polarization coherent detection. The channel is modeled as a discrete time Gaussian channel with conjugate inter-symbol interference.
We demonstrate a 40Gb/s pure photonic packet switch testbed for a datacenter network. It uses a photonic wrap/un-wrap to handle all packet sizes, separate control and data paths, and a synchronization scheme to align packets of all nodes at the photonic switch despite different network fiber lengths.
The multi-granular optical-path architecture is a viable approach to creating large-scale optical metro and core networks. We conduct transmission and distributed signaling experiments that emulate the proposed architecture and confirm its technical feasibility.
We demonstrate a polarization diversity scheme using fiber polarization splitters for 4×4 Si-wire optical switch. Path-independent on-chip loss of 4.8±0.5 dB and crosstalk of less than −30 dB are achieved with PDL below 1 dB.
This article aims at controlling Optical Networks in software method based on OpenFlow Extension. We abstract OTN equipment on Layer Class and combine it with OpenFlow to achieve unified management of data and optical plane.
A fast wavelength switching method for ordinary distributed feedback (DFB) lasers utilizing a thermal compensation region outside the laser is proposed. A switching time of 88 ms is obtained. We also demonstrate successive multi-wavelength switching.
This paper shows our optical packet and circuit integrated network providing dynamic optical path setup, high-density optical packet multiplexing and flexible wavelength resource allocation with a centralized control mechanism, which is useful for network virtualization.
We propose a novel cost efficient node architecture for a wavelength division multiplexed packet-switched network based on reflective integrated device. We demonstrate a 16-channel, silicon-on-insulator, reflective monolithic integrated slot-blocker that integrates one arrayed waveguide grating, 16 variable optical attenuators, 16 Bragg grating mirrors and one vertical fiber coupler. Small-form factor...
We propose a multiple input and multiple output wavelength selective switch (MxN WSS) with an optical configuration that uses a single diffractive optics deflector. In the proposed WSS, broadcast-and-select functionality is achieved by multi-angle diffraction and control of diffraction angle using the phase modulation patterns on a spatial light modulator such as liquid crystal on silicon (LCOS)....
We experimentally demonstrate ultra-long-haul multi-core fiber transmission using a cladding pumped 7-core erbium-doped fiber amplifier. We confirm 76 × 128-Gbit/s Nyquist-pulse-shaped DP-QPSK signals are successfully transmitted over 4,200-km 7-core fiber.
We present the method of the high-speed wavelength switching of the tunable distributed amplification (TDA-) DFB laser by feedforward control. We designed and simulated the feedforward controller to accelerate the wavelength switching. A switching time of less than 100 ns with a frequency deviation of less than 1 GHz was achieved at switching toward 400-GHz spaced channels. The results indicate the...
Broadband 1×4 thermo-optic switch is demonstrated based on four W2 photonic crystal waveguides with footprint of 17.6 µm×8 µm. Extinction ratio larger than 15dB is obtained over the bandwidth of 15±1 nm in each channel.
A long-haul transmission of 1.28Tb/s quad-subcarrier PM-16QAM based superchannel (5.0bit/s/Hz) employing EDFA only/ EDFA-Raman amplification schemes is reported. Maximum recorded reach is 3,000km/ 2,050km and 3,350km/2,250km without and with DBP for LAPSCF/ SSMF, respectively.
Tbit/s transmission capacities are demonstrated in a 1,000 km field trial, provided by Deutsche Telekom, between high performance computing centers of the Universities Dresden and Stuttgart. Brocade and Intel Security Technologies are used to perform Tbit/s generation and processing including software defined networking and network virtualization functionalities. Increased 3 bit/s/Hz spectral efficiency...
This paper presents design and evaluation of software defined data center network architecture with hybrid optical wavelength routing and electrical packet switching (HWRE), which largely improves network performance such as packet delay and network throughput.
We demonstrated a novel metro-embedded datacenter architecture with intra-datacenter optical burst switching ring and inter-datacenter optical burst switching over wavelength switched optical network interconnections, and virtual datacenter provisioning under the coordination of SDN control plane.
It's three of ultra-high guarantied bandwidth, ultra-low energy, and ultra-low latency, enabling the first real-time remote music session using uncompressed 8K-video transmission between Tokyo and Tsukuba over a field-deployed large-scale dynamic optical path network.
The dynamic optical packet switching network based on advanced SDN/Openflow control is introduced in this paper. Promoted resource allocation and prompt network adjustment is achieved under dynamic network environment with real-time optical packet monitoring.
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