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A new back-illuminated uni-traveling-carrier photodiode (UTC-PD) is designed for long-wavelength applications in this paper. This device design incorporates dual absorption regions with conventional UTC-PDs, simultaneously by adopting a cliff layer in the collection layer to obtain high efficiency and high speed. Theoretical and simulation study indicate that the responsivity of the 14 µm2 active...
Proposed in paper is a clustered LR-PON with hierarchical architecture and multi-dimension DBA, applying MPCP and PPPoE to tree topology and star topology. The DBA scheme is based on dimensions of wavelength, frequency and time.
We review bandwidth constraining and digital signal processing techniques for achieving high spectral efficiency optical fiber transmissions. We discuss advantages and disadvantages of three different combinations of adaptive equalization and sequence detection schemes, and show experimental demonstrations.
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.
We demonstrate transmissions of 25Gb/s signals from 1310nm silicon photonics transceiver over OM4 MMF through modal dispersion compensation. With the compensation fiber, ∼1dB link power penalty was achieved over 70 and 100m OM4 fiber links.
A 20Gb/s Transimpedance Amplifier (TIA) is implemented in 65nm CMOS process using input-serial-peaking technique. Measurement results show that the hybrid integrated TIA with PD achieves up to 20Gb/s clean optical-diagram, with 4.3ps RMS-jitter, consuming 7.2mW.
Polystyrene was used to fabricate gradient index structure for terahertz antireflection via a hot-embossing process. Compared with a single non-structured antireflective layer, the gradient index structure increases transmittance by 20% and has broader enhanced bandwidth.
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 realize a stable single source infinite impulse response microwave photonic filter with GHz level free spectral range based on a coherence managed multi-longitudinal-mode erbium doped fiber laser by controlling the filter bandwidth and cavity length.
We investigate the modulation bandwidth and frequency chirp of transverse-coupled-cavity VCSELs. The simulation shows the 3dB-modulation bandwidth can be doubled and the chirp can also be reduced by a factor of more than two simultaneously.
An intra-cavity loss modulation laser diode (ICLM-LD) was proposed and its characteristics were evaluated numerically and experimentally to realize an ultra wideband direct modulation external cavity laser. It was confirmed that the intra-cavity loss modulation can suppress the modulation sensitivity degradation over the relaxation oscillation frequency, which will be effective to widen the modulation...
We have demonstrated phase noise measurements of ytterbium doped fiber amplifier on transient pumping process based on active phase locking using optical heterodyne detection from all-fiber Mach-Zehnder interferometer. The intrinsic and extrinsic factors during amplifying process worsen coherence and lead to randomly fluctuated phase error. Root mean square, power spectral density, and phase drift...
We describe our recent progress on a linear optical sampling technique. Thanks to broad bandwidth and direct complex amplitude accessibility, the technique enables WDM signal demultiplexing by digital signal processing and laser phase noise characterization.
Depletion region of uni-traveling-carrier photodiodes (UTC-PDs) is optimized. Wide bandwidth of 28.5 GHz and high saturation photocurrent of 38 mA at 20 GHz are achieved for a 14-µm diameter device.
High-efficiency wavelength conversion based on the quasi-phase-matching technique is proposed and simulated in a slot waveguide. Benefit from the tight light confinement and the high nonlinear material (silicon nanocrystal) filled in the slot region, a large nonlinear coefficient is achieved. With the linear phase-mismatch alternately changing between two values of the opposite signs, periodical attenuation...
We review new options for long wavelength multimode fibers for high speed transmission at 25Gbps and present recent results for different transceivers using these new multimode fibers or operating using modal dispersion compensating multimode fibers.
We propose a load balancing algorithm to manage data transmission over multiple wavelengths in TWDM-PON. Each wavelength is controlled to be in the balanced load state or lightly-loaded state. Analysis and test demonstrate salient results.
We review recent single-carrier 400G schemes based on high baud rate signals with different spectrum efficiency (SE) based on QPSK and 16QAM. The long-haul performances under different transmission conditions and modulation formats are studied. The digital signal processing for 400G signal recovery is also discussed.
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.
Femtosecond pulse lasers offer breakthroughs in precision metrology particularly in the fields of time, distance and spectroscopy. This advance attracts much attention to extend today's space missions by improving the precision of remote sensing and control capabilities. In this presentation, we introduce how femtosecond lasers are being investigated for space explorations in the near future.
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