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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.
We developed a transmission system that applies an FEC coding scheme to an uncompressed 72-Gb/s 8K UHDTV optical signal. Stable optical transmission of the 8K image is successfully demonstrated in a 173-km field fiber experiment.
We propose a channel-reuse, long-reach WDM-PON scheme and an optical beat noise-based automatic wavelength management method. A 40 km reach, channel-reuse, 40 Gb/s/λ downstream and 10 Gb/s/λ upstream signal transmission on a 100 GHz WDM grid is demonstrated.
An all-optical demultiplexing of 40-Gb/s hybrid OTDM channels by using Raman-amplifier-soliton-compressor-flexible control-window is demonstrated. Error-free operations with less than 1.3-dB power penalties were obtained and this scheme is expected to be scalable toward higher bit-rates.
We experimentally verified the effectiveness of a novel digital pre-emphasis technique to compensate limited DAC bandwidth for next generation flexible systems. A gain larger than 1dB/0.1nm OSNR at the 7%-FEC limit has been experimentally verified for 8, 16 and 32QAM.
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 report the experimental demonstrations of direct detection 12.5/25 Gb/s single sideband Nyquist pulse-shaped QPSK/16-QAM subcarrier modulation, generated using a dual-drive Mach-Zehnder modulator. Utilizing electronic pre-distortion, transmission over 1614/484km of standard SMF was achieved.
A novel variable optical attenuator (VOA) based on two coupled rings in silicon-on-insulator (SOI) waveguides has been proposed and experimentally demonstrated, from which an attenuation varying from 0 dB to 35 dB can be obtained.
A TCM-based WDM-PON using a single RSOA is proposed to improve the cost-effectiveness in highly asymmetric traffic conditions and its feasibility is experimentally demonstrated. It reduces component count and increases sensitivity for downstream signals, yet meets the bandwidth requirement.
We investigated the gain compression between two optical signals with different channel spacing in a conventional semiconductor optical amplifier (SOA) and quantum-dot SOA (QD-SOA). In the QD-SOA, the inhomogeneous gain broadening effect was clearly observed.
We propose optical 8D time-polarization modulation using square-QAM-constellation and a simple decoding algorithm. Experiments show that the proposed modulation format can achieve significant gain and the decoding algorithm has the same performance as conventional maximum-likelihood-detection.
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