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We identify experimentally the effects of laser linewidth and intensity noise on optical OFDM systems, and show that commercial DFB lasers are suitable transmitters even when operated at low powers.
We show that the non-reciprocity of traveling-wave electrodes can efficiently impress phase modulation onto the reflected upstream signals only. Monolithically integrated transceivers may thus remodulate downstream signals for upstream data transmission without needing optical circulators.
The distribution of ultrafast optical pulse trains across 300 meters of fiber with sub-femtosecond timing jitter and 83 femtoseconds of drift over 25 hours, as measured between the outputs from two independent links, is demonstrated.
We present theory and experiment quantifying the limitations to stable transport of optical frequencies over optical fiber. These are fundamental fiber noise, propagation delay, bidirectional propagation and system noise in the measurement interferometers.
For developing a 1-mum waveband photonic-transport system, we fabricated a harmonically mode-locked semiconductor laser (MLL) RZ-signal source. We successfully demonstrated a 10-Gbit/s error-free transmission over a 7-km single-mode hole assisted fiber (HAF) at 1035- nm.
Optimal operation for a homodyne analog link with in-phase/quadrature detection is obtained for biasing to equalize photocurrents. We show a net link gain >5 dB with <15 dB noise figure can be obtained with >12 mA photocurrent.
A novel polarization-frequency-multiplexing scheme is implemented to suppress noise in a fiber-based Gaussian-modulated coherent-state quantum key distribution system. The achievable secrete key rate is 0.30 bit/pulse with a 5 km-fiber and 0.05 bit/pulse with a 20 km-fiber.
We experimentally verified a decrease of stimulated Brillouin scattering threshold for 10 Gb/s NRZ-OOK signals with respect to theoretical predictions. We relate this reduction to Rayleigh backscattering interaction with Stokes backscattered spectrum. BER curves are shown.
We use the cost-effective APM technique to increase the non-linear tolerance of NRZ-OOK, and we demonstrate, in a recirculating loop experiment, the transmission over 2800 km SSMF of 16 NRZ-OOK 40 Gb/s channels with 100 GHz spacing.
We demonstrate 10 Gb/s VCSEL based transmission over 100 m of larger core (120 mum) graded-index perfluorinated plastic optical fiber, thus establishing that multi-transverse-mode VCSELs are compatible with highly alignment tolerant plastic optical fiber.
We propose a novel, fiber-based correlator for processing temporal optical signals. We demonstrate its operation by performing all-optical packet-header recognition at 100 Gb/s.
Stealth communication using coherent SPE-OCDMA is demonstrated. The coherent approach can provide higher spectral efficiency than incoherent optical CDMA.
We describe a novel scheme for encryption in the physical layer, that allows key establishment at rates that are compatible with the rates used in modern optical systems and thereby ultimate security can be achieved using the one-time pad protocol.
We describe a complete continuous variable quantum key distribution setup, reaching more than 2 kbit/s over 25 km. Time-multiplexing is used, and reconciliation is performed using fast and efficient LDPC error correcting codes.
We review the merits of using fiber as a nonlinear media for production of correlated and entangled photon pairs for quantum information applications and we present history, status, and fruits of efforts in this area.
We propose and demonstrate all-optical clock recovery (CR) from both NRZ and NRZ-DPSK signals at different bit-rates, through simply preprocessing with single optical filter. Clock signal can be extracted successfully by cascading a CR unit.
We have experimentally implemented a differential phase shift quantum-key distribution system with up-conversion detectors operating at a 2.5 Gbps clock rate. A Michelson interferometer with Faraday mirrors is used to increase the system stability.
We propose and experimentally demonstrate a compact 1-to-5 DPSK wavelength multicasting scheme using FWM with three unequally-spaced pumps in a 2-m-long Bi-HNLF. Power penalties are within 1.9-dB for all the converted signals.
We experimentally demonstrate uncompensated WDM transmission over a 470 km hybrid fiber link using two versions of duobinary and in-line SOA amplification. MLSE receiver technology partially mitigates the accumulated dispersion of approximately 3300 ps/nm.
Optical orthogonal frequency division multiplexing (OFDM) is a type of electronic dispersion and nonlinearity compensation that is scalable to extremely-high data rates, offering plug-and-play convenience in free-space, multimode and long-haul communication systems.
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