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New Ground-to-Train High-Speed Free-Space Optical Communication System with Fast Handover Mechanism
Free-space optical communication Scanners
2015/5/26
We developed a new ground-to-train free-space optical communication system that performs stable high-speed communication even when a train is running at high speed and does fast handover between laser...
Unaltered Optical Fiber as an Absolute Wavelength Reference for OFDR Systems
Interferometry Phase measurement
2015/5/25
We present a novel method of obtaining an absolute wavelength reference for OFDR measurements using Rayleigh backscatter from standard optical fiber. We report 1 GHz (8pm)accuracy.
Characterization of a MEMS Based Optical System for Free-Space Board-to-Board Optical Interconnects
Free-space optical communication Alignment
2015/6/9
We demonstrate alignment of an array of VCSELs to detectors, using a MEMS-based lens system for free-space board-to-board optical interconnects. Our optical system is capable of aligning up to 5 degre...
The Transition to Chip-level Optical Interconnects
Optical Interconnects Photonic Integrated Circuits
2015/6/8
The increasing bandwidth demands of computing chips have spawned significant research into chip-scale photonic interconnects. We review the DARPA-sponsored efforts at the inter- and intra-chip interco...
Optical Biasing in Direct Detection Optical-OFDM for Improving Receiver Sensitivity
Fiber optics communications Modulation
2015/6/4
We show that replacing of electrical by an optical biasing minimizes the nonlinearity effect of an optical modulator. This allows the amplitude of the driving signal to be increased which increases th...
Sensitivity of Balanced Receivers for Polarization Shift Keying in Free-Space Optical Communications
Sensitivity Balanced Receivers Polarization Shift Free-Space Optical Communications
2015/7/20
Polarization modulation is a robust and efficient format for optical free-space communications. We study the sensitivity of real-world balanced receivers, including possible atmospheric effects on the...