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We characterize the mode profiles, delays and mode-dependent gains of an erbium-doped step-index multimode fiber using C2 imaging based on a swept-wavelength interferometer. Space-to-time mapping is used to reduce measurement time.
We describe a multimode fiber bandwidth metric significantly more strongly correlated to link inter-symbol interference (ISI) penalties than conventional metrics. The improvement is demonstrated in plots of ISI vs. bandwidth for various link lengths.
The properties of rectangular core fiber are investigated for mode division multiplexing. Polarization degenerate mode groups, favorable mode profiles for device coupling, modal area uniformity, and good splice performance suggest it's a good candidate.
We analyze the capacity of SDM networks under limited DSP complexities. Results show that DSP complexity limitations can severely restrict the network capacity enhancement brought by adding spatial channels, especially for large-scale networks.
Two burst-mode CPFSK transmitters using directly-modulated DFB-LDs are proposed and high receiver sensitivities of −44.0 dBm and −45.0 dBm are measured in experiments, both of which are record values for 10-Gb/s CPFSK signals.
We experimentally demonstrate 3×10 Gb/s mode group-multiplexed transmission with direction detection in a step-index few-mode fiber over a record reach of 20 km, enabled by low crosstalk photonic lanterns as mode group (de)multiplexers.
We experimentally demonstrate a flexible coherent UDWDM system with support to optical-wireless links and adaptive DP-QPSK/DP-16QAM modulation, enabled by Stokes-based polarization-demultiplexing. The system is shown to be resilient to dynamic power ranges of >12 dB.
We present a fiber-to-chip coupler using asymmetric double slot waveguide and direct strip-slot mode coupling to shorten a transition while maintaining high coupling efficiency. Experimental result shows 1.8 dB insertion loss with a broad bandwidth.
We develop an energy-saving scheme for the shared backup path protected (SBPP) IP over WDM network through sleeping protection router cards. Results show that the scheme is efficient and reduces energy consumption significantly compared to other conventional schemes.
A heterogeneous single-mode 37-core fiber with a cladding diameter of 248 μm is designed and fabricated. The fiber provides the highest core count and low total-crosstalk less than −20 dB/1000 km in C+L band.
We demonstrate integrated, mode-evolution-based, 1×2 port high-pass/low-pass filters in a silicon photonics platform that can simultaneously achieve broadband operation, single cutoff wavelength, and a record high filter roll-off of 2.5 dB/nm for the first time.
We demonstrate the first cascaded operation of integrated 4×4 hybrid MZI-SOA optical switches. Experimental studies emulate a 16×16 hybrid switch with 15dB IPDR for 1dB penalty and 43% reduced power consumption than equivalent SOA-based switches.
We demonstrate how to harness mode-selective excitation of nonlinear optical effects to perform simultaneous multi-channel RF spectrum analysis for both 640 GHz and 160 GHz waveforms using a single integrated silicon photonic device.
A high-bandwidth micro intradyne coherent receiver for 64 GBaud data rate using InP-based 90° hybrid integrated with photodiodes is demonstrated. The package is compliant with OIF Micro-ICR implementation agreement. A 3 dB bandwidth of 40 GHz with differential transimpedance of 4500 ohm and high average responsivity more than 70 mA/W within the C-band are achieved.
A new Si/Ge/Si heterojunction based waveguide photodetector has been demonstrated in order to reduce the fabrication cost, increase the responsivity, and improve process robustness. State of the art characteristics in terms of dark current, responsivity and bandwidth have been obtained. Furthermore, such photodetectors were characterized in avalanche mode in order to improve the sensitivity and reduce...
We propose a novel network architecture that enables intra- and inter-datacenter converged flow management. By adopting our proposed single large-scale optical circuit switch, intra- and inter-datacenter traffic can be transported without any blocking.
Multi-vendors G.654.E fibres field trials for 400G terrestrial transport systems were demonstrated. The evaluation works carried out by China Unicom for high bitrate terrestrial transport application are introduced. Test results in factories and fields are analyzed detailed.
We describe a low-loss fiber-bundle-type fan-in/fan-out device for 6-mode 19-core fiber, which achieves physical-contact connection. We suppress the mode-dependent loss of the device by accurately arranging fibers and utilizing a precise rotational alignment mechanism.
We demonstrate a 4×28 Gb/s PAM4 Long-reach-PON over 80 km fiber with more than 33 dB power budget. A low complexity nonlinearity compensation using sparse Volterra filtering is applied with excessive optical dispersion compensation.
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