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We design and fabricate a space-efficient single-mode fiber (SMF) having a diameter of only 82 µm. The results show that this fiber satisfies the optical and mechanical specifications of the ITU-T G.654 recommendation. In comparison to the conventional SMF having a diameter of 125 µm, this fiber can be used to double the spatial efficiency in the space-sensitive system.
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 an individual channel launch power control method co-operated with nonlinear compensation in digital signal processing. Its effectiveness is evaluated in a network case study with various distances and modulation formats by numerical simulation.
We propose a spectrum defragmentation system using maximum ratio combining in wavelength diversity digital coherent transmission. We evaluate the maximum ratio combining characteristics and experimentally show hitless defragmentation of a 128-Gb/s PDM-QPSK signal.
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.
We report performance improvements by nonlinear mitigation techniques in homogeneous and heterogeneous network environments. Our results show that super channels with small sub carrier count benefit most from nonlinear mitigation.
Tidal traffic caused by the large-scale population migration between workplace during the day and residence at night are becoming a crucial problem for metro network control and management. We introduce an effective tidal traffic dispatching scheme with a novel TIDAL model based on software-defined architecture. Simulation results show that our proposed scheme can significantly reduce the network...
We propose a novel active stateful PCE-based inter-domain routing strategy for BRPC domain sequence selection, which is validated through experiments. Results show that our proposed strategy performs better in blocking probability.
We define k-content connectivity as the reachability of at least one content from any point of a data center network under concurrent k-1 failures. A flexible content placement algorithm is proposed to achieve k-content connectivity.
We investigate nonparameter nonlinearities mitigation method using a nonlinear electrical equalizer. Simulation of 25GBaud single-carrier single-polarization 16-QAM system shows a Q value improvement of up to around 1dB over 1600km fiber transmission without knowing of any link parameter.
This paper describes the work done to test the interoperability of northbound interface implemented in the controllers of a transport SDON prototype. A test framework named NBI Platform is introduced and used in this test.
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 and demonstrate Artificial Neural Network (ANN) based temperature profile extraction from local Brillouin gain spectrum in BOTDA fiber sensor system. Results show that ANN can adopt large frequency scanning step and hence reduce BOTDA measurement time significantly.
We demonstrated the fabrication of long period fiber gratings written in two-mode fiber as mode converter to realize the mode conversion between LP01 mode and LP11 mode with an efficiency of up to 99.9%.
A highly-birefringent phase-shifted fiber Bragg grating (PS-FBG) was inscribed with femtosecond laser and a uniform phase mask. The PS-FBG was fabricated from an ordinary FBG in case over exposure was applied. The spectral evolution from FBG to FS-FBG was observed in accompany with a decrease in transmission loss, a ‘blue’ shift of dip wavelength, a decrease in cladding mode loss, and an increase...
A silicon waveguide resonator filter built with two high-index-contrast Bragg gratings is proposed to selectively reflect and thus remove specific wavelengths, like a fiber Bragg grating, in standard silicon waveguides and its feasibility is experimentally demonstrated.
We present a novel nonlinear crosstalk mitigation technique based on subcarrier power pre-emphasis. We experimentally investigate performance improvement for four-subcarrier DP-QPSK superchannel in dispersion-uncompensated transmission for various transmission distances and guard bands.
Pre-dispersed spectral inversion enables ∼2.7dB, ∼2.3dB, and ∼1.6dB improvements for SSMF, LAPSCF, and TWC based uniform fiber links, respectively. Non-uniform links employing 50% mixing (worst-case) enable ∼1.3dB and ∼0.5dB improvements for SSMF/LAPSCF and SSMF/TWC fiber-mixes.
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...
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