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In recent years, NV centers in diamond has attracted significant attention as a candidate for quantum information devices. The negatively charged NV center, in particular, has been intensely investigated [1-3]. NV− centers host both an electron spin qubit and a nitrogen nuclear spin, in our case a nuclear spin-1/2 of 15N is imbedded. The ground state of the electron spin qubit has a long coherence...
We experimentally demonstrate coherent spectral phase encoded optical code-division multiple access that fully suppresses multiple access interference and speckle noise for the first time without the need for fast nonlinear time gating.
We present results from an optical communications testbed demonstrating polar coded pulse position modulation transmitted to a direct detection receiver. Using weak coherent states we achieve a photon information efficiency of 4.8 bits per received photon.
We review recent advances in the pursuit of photon-efficient modulation and detection for optical communications. Hybrid modulation superimposing coherent modulation on pulse-position-modulation and 4-dimensional modulation are presented. Applications of these high photon-efficiency formats are discussed.
We present, theoretically and experimentally, non-broadening optical beams having arbitrarily small superoscillatory features. Our design facilitates control over the symmetry, width, and rotational orientation of the superoscillating beams.
We demonstrate detection and ranging of various targets, including aerosols, gas spectral signatures and translucent sample thickness using dual comb interferometry. Highresolution hyperspectral traces are obtained from targets at a distance of 175 m.
We demonstrate real-time drift correction of a quantum cascade laser based direct absorption trace-gas sensor using a rotating in-line reference cell. High accuracy and performance sufficient for long-term environmental monitoring has been demonstrated.
We describe an intracavity doubled continuous wave singly resonant OPO (CW-SHG-SRO), exhibiting tunable operation between 585 and 678 nm. Its frequency is locked to better than 1 kHz over 1 s relatively to a cavity.
Using modulator-generated optical frequency combs we measure the distance to scattering technical surfaces. We achieve measurement errors below 10 μm, a dynamic range of over 37 dB and an acquisition time of 8.3 μs.
Record transmissions with the direct modulation of a 1550nm-hybrid III/V-on-Silicon laser of 21.5Gbps in optical back-to-back (B2B) and 12.4Gbps over 50km of Single-Mode Fiber (SMF) are achieved. Neither optical amplification, nor optical dispersion-compensation is used.
By integrating compact and high-speed silicon modulators and germanium photodiodes with light sources, we demonstrated a silicon optical interposer for inter-chip interconnects with a bandwidth density of 6.6 Tbps/cm2.
Error-free detection at 1 Gb/s is demonstrated with a Si ion-implanted waveguide photodiode operating at 1.9 μm. The measured 0.14-A/W responsivity corresponds to a 5 dB decrease in photocurrent compared to operation at 1.55 μm.
A rate-adaptive, software-defined, coded-modulation scheme based on irregular quasi-cyclic LDPC codes designed using the concept of pairwise balanced designs is proposed. The proposed scheme outperforms the corresponding scheme based on regular LDPC codes, and eliminates the error floor phenomenon of regular LDPC codes.
We experimentally demonstrate the working principle of an all-optical transistor in semiconductor planar microcavities, based on the non-linear interactions between two polariton fluids. The operation as AND/OR gate is shown, validating the connectivity of the system.
We combine a near-field scanning optical microscope (NSOM) with crossed beam spectral interferometry, to enable a full local optical characterization of photonic structures.
Monolithic meter-size diffraction gratings are required to improve kilojoule, petawatt laser-system performance. A deformable-grating-based pulse compressor with optimized actuator positions is presented to correct the spatial and temporal aberrations induced by grating wavefront errors.
Optical dual-pulse sampling for detection of vector signal is proposed to alleviate the bandwidth requirement on optoelectronic devices. An experiment on receiving 4-Gbaud QPSK 16-GHz radio over fiber has been demonstrated experimentally.
We propose to utilize a diverging time lens for LiNbO3 modulator based OTDM demultiplexing. Error-free detection is successfully demonstrated with 2.4-dB power penalty for all channels, 1.1 dB for the best channel.
A 25-GHz 3-ps optical Gaussian pulse generator using phase modulators is experimentally demonstrated with wavelength tunability over C-band. Error-free 100-km transmission of 100-Gb/s OTDM signal is achieved with it.
A metasurface layer of λ/50 thickness is developed to produce the optical rotation effect of chiral media through the use of a plasmonic nano-antenna array that generates a phase-shift between helical components of incident light.
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