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By employing 25-GHz-mode-spacing electro-optics-modulator-based optical frequency comb at telecommunications wavelengths, we have successfully demonstrated that phase noise in a commercially available signal generator at 25 GHz can be dramatically reduced to less than ever before.
We present techniques for measuring the damage performance of a variety of optical components with ps laser pulses, introduce a novel beam diagnostic technique, and explore the sensitivity of damage resistance to laser spot size for the case of high-reflectivity, multilayer dielectric (MLD) mirrors.
Reported here is a method for trimming the resonant frequency of microring resonators by permanent thermal modification of a waveguide cladding. This method would use in-situ heaters, avoiding the need for highly specialized equipment.
A high-flux, soft x-ray light source, based on high harmonic generation, using 1.5-mJ, 10.1-fs IR pulses with CEP stabilization, has been constructed and used to resolve the 1s-π∗ and -σ∗ transitions in absorption spectra at the carbon K edge.
We present a novel software-defined radio transceiver, which takes advantages of RF photonic techniques to realize the state-of-the-art performance in the aspect of the frequency range to cover from C band to Ka band.
We demonstrate 6dB improvement in phase noise of a mode-locked semiconductor laser using coherent photon seeding, achieving a record linewidth of 29kHz. The complete photonic-circuit including the feedback cavity is integrated on a single chip.
Efficient in-phase coupling of hundreds of lasers by means of combined Talbot cavity and intra-cavity spatial Fourier filtering is developed. Simulated and experimental results for square, triangular and honeycomb laser arrays are presented.
A Standoff detection scheme for buried landmines and concealed explosive charges based on genetically engineered bacterial biosensors is presented. Concentrations of 4 mg/L of 2,4-DNT on soil were detected from a distance of 50 meters.
Dynamic and static optical pulse shaping with line-by-line control is shown, using a 12-channel injection-locked VCSEL linear array. With channel modulation frequencies up to 3.125 GHz, pulse shape changes within 1 ns are conclusively demonstrated.
We demonstrate an on-chip optical spectrum analyzer (OSA) using two cascade optical ring resonators. The OSA's span is wider than 50nm and resolution is ∼0.1nm. A germanium photodetector and a p-i-n modulator are integrated on the chip and used for detection.
A symbol rate identification method is proposed for optical signals with commonly used modulation formats. Numerical simulation and experimental results show it is accurate and robust to different link impairments.
An electro-optically spectrum tailorable intracavity optical parametric oscillator (IOPO) was built based on a novel integrated aperiodically poled lithium niobate. Spectral narrowing and manipulation of the IOPO signal was demonstrated simply by electro-optic control.
A new network scheme employing stable seed lightwave distribution is investigated for reducing QAM demodulation complexity. We perform 150 km seed distribution before 100 km WDM-PDM-64QAM transmission and achieve simple demodulation without phase estimation.
Ultra-compact wavelength tunable laser diode with wide tunability was successfully developed with combining quantum dot optical amplifier and silicon micro-ring filters. The single mode laser oscillation was demonstrated with 25 nm wavelength tuning range.
We demonstrate a spectrally efficient parametric comb source for WDM applications using a Si3N4 dual-coupled microring resonator. This geometry allows for operating wavelength flexibility and avoidance of mode crossings for stable comb generation.
A new fabrication technique for ultra-thin, flexible and optically tunable terahertz metamaterials with embedded silicon is presented. The implemented bandpass filter had a subwavelength thickness of 25 μm and provided a quasi-etalon free maximal amplitude transmission of 80 %. By optical tuning with a 500 mW strong modulation laser an amplitude modulation depth of 94 % was achieved at 0.65 THz.
We study extraordinary optical transmission by placing a metal screen with a 1-D array of holes inside a parallel-plate waveguide at terahertz frequencies. We find excitation with TE1 or TEM mode strongly affects output transmission characteristics.
We propose a novel approach to quantum cryptography using the latest demultiplexing technology to distribute photonic entanglement over a fully fibred network. We achieve unprecedented bit-rates, beyond the state of the art for similar approaches.
We present a first experimental demonstration of classical CW laser condensation in the frequency (mode) domain. It also sheds light on the general question of photon-BEC (Bose-Einstein condensation) in laser cavities.
We demonstrate space variant polarization and phase converters imprinted by femtosecond laser nanostructuring in hydrogenated amorphous silicon thin film. Giant birefringence of imprinted structures allows fabrication of microoptic element arrays.
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