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We have studied transmission degradation for sub-wavelength diameter Tapered Optical Fibers in Rubidium vapor. A heating strategy is shown to reduce degradation, thereby enhancing the ability to perform ultra-low-power nonlinear optics experiments.
An optical fiber taper placed in the near field of a “split-beam” photonic crystal nanobeam cavity with a physical gap at the cavity center breaks the system's vertical dielectric symmetry, enabling selective optomechanical coupling to multiple cantilever resonances using a single optical nanocavity mode.
We report the first demonstration of CW-pumped correlated photon-pair generation in an AlGaAs waveguide with a coincidence-to-accidental ratio > 100. This is about two orders of magnitude greater than previously reported in AlGaAs waveguides.
The effect of third-order dispersion in a Hong-Ou-Mandel interferometer is investigated using a ZnSe crystal as a dispersive medium. A value for the TOD coefficient of ZnSe is extracted which is consistent with literature values.
Down-conversion from a THz beat generated by a two-frequency solid-state laser to a RF intermediate frequency is performed with a zero dispersion-slope fiber. The two interleaved four-wave mixing spectra contain more than 75 harmonics.
An experiment of two channels WDM with 5 Gb/s has been performed. Chaotic characteristics of the propagated signals with different GVD and nonlinear impairments in this optical-fiber link have been analyzed through these experimental data.
We report a broad range of swept source performances based on a highly-flexible external cavity laser architecture embodied within a compact butterfly package. Multiple spectral regions from 830nm to 1630nm and sweep frequencies from 1kHz to 200kHz are demonstrated.
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.
Coherently injection-locked and directly modulated WRC-FPLD for optical 16-QAM/122-subcarrier OFDM transmission at 1.5625GHz central carrier over 25km is demonstrated to achieve 12.5Gbit/s bit-rate with receiving sensitivity of −7dBm at BER of 1 × 10−7.
We investigate coherent matched detection with paired fiber configuration, which improves phase matching between received time-frequency domain multiplexed signals and multicarrier local oscillator, giving a tolerance to residual dispersion.
Bit-by-bit wavelength switching for 10 Gbps signal based on a cross phase modulation in a fiber was successfully demonstrated by using 10-ps-wide saw-tooth control pulse generated from an optical pulse synthesizer.
A modified differential double pulse Brillouin sensing technique is demonstrated where both the wide and somewhat narrower pulses are launched simultaneously, rather than sequentially, using different frequency carriers.
We report the spectral pump equalization of on-chip microresonator frequency combs in the drop-port geometry. A smoother comb spectrum is obtained and a saturation behavior of the optical pump in the microresonator is observed.
We propose a novel low-cost photonic radiofrequency (RF) beamforming network which eliminates the dispersion induced RF power degradation. A RF bandwidth of 40 GHz and a tunable delay range of 750 ps were demonstrated.
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 measurements of Raman scattering emission in high Q factor As2S3 microspheres. Emission is observed for input powers down to 120 μW and for resonances with Q factor below 107.
A fiber-coupled, 10-kHz, UV-PLIF and PIV combined detection system employing a common 6-m-long optical fiber is developed for simultaneous 2D fields of OH radical concentration and velocity measurements in practical combustion facilities.
A multilayer dielectric coating deposited on the endface of a single-mode fiber is used as an optical sensor for high pressures. The reflectance of the coating decreases by 10% for a pressure of 710 MPa.
We demonstrate an extended depth of focus (DOF) for optical coherence tomography (OCT) using a Bessel-like higher order fiber mode. The DOF is enhanced by 7× and the lateral resolution is about 10 μm.
Micro-drilled hollow fibres as gas sensors are developed and calibrated using wavelength modulation spectroscopy technique. This method has shown acceptable accuracy and sensitivity to be used in underground coal mine methane gas detection.
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