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A one-dimensional photonic bandgap lattice consisting of 72 periodically-cascaded microrings was fabricated in benzocyclobutene. A wide bandgap of 1.6 nm and extinction > 20dB were achieved. The device exhibited low transmission loss even after 72 microrings.
We propose a tunable spectral bandpass filter using short- and long-wavelength bend-loss edges of both MSF and HOF. Various spectral functionalities of filter are obtained by carefully choosing optimal bend radii for serially concatenated fibers.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
In this paper we propose a new technique that enables optical single sideband generation for optical subcarrier multiplexing. A high sideband suppression ratio is achieved across the full RF spectral band.
We demonstrate for the first time the low penalty cascaded performance of a 1.3mum QD SOA. Eleven passes are feasible for 10Gb/s data while maintaining a Q-factor exceeding 6 for filter-free operation.
We demonstrate a new wavelength-division scanning method for two-photon excitation fluorescence imaging. Two-photon imaging results using lateral wavelength division scanning are presented. Feasibility of axial wavelength division scanning is discussed.
We demonstrate line-by-line pulse shaping control for optical arbitrary waveform generation (O-AWG). Independent manipulation of individual spectral lines from a mode-locked frequency comb leads to synthesis of user-specified ultrafast optical waveforms with unprecedented frequency resolution.
We demonstrate the longest unrepeatered and uncompensated SOA-based transmission of 16times10 Gbit/s channels over 140 km single mode (G.652) fiber. We exploit the DPSK modulation format, two commercial SOA devices and a frequency-periodic narrow optical filter.
Terahertz transmission filters have been manufactured by perforating metal films with various geometric shapes which all support over 99% transmission at specific frequencies determined by geometric shape, symmetry, polarization, and lattice constant.
Recent leading-edge status of waveguide-loss and cavity-Q for photonic crystals and all-optical switching action in resonator-waveguide-coupled systems are described. All-optical digital processing chips and novel ways of dynamic controlling light will be also discussed.
We demonstrate control of excited state wave packets in LD690 by spectral and phase shaping of the pump pulses. Blue detuned, positively chirped pulses maximize the excited state coherences and slow down the vibrational dephasing.
EIT-based atomic clocks built as active oscillating loops can be compact and low-power, if the loop is closed by current modulation of VCSEL. The clock performance is shown to critically depend on the VCSEL properties.
We present measurements of the transmission amplitude and phase properties of Coupled-Resonator Optical Waveguides in the form of a large number ( >10) of weakly coupled microring resonators fabricated in optical polymers.
We discuss transformation and measurement of arbitrary four-level optical quantum systems, based on biphotons. A simple scheme preparation of twelve basis states serving for quantum key distribution protocol is suggested as well.
A triple-sensor multiplexed fiber-optic displacement sensor is reported, which is based on optical frequency-modulated continuous-wave (FMCW) interference and frequency-division multiplexing. The advantages include high accuracy (0.08 mum) and long dynamic range (1000 mum).
A confocal coherent anti-Stokes Raman spectrometer was successfully applied to sensitive detection of THz-frequency modes in biomolecules (0.9-51 THz). Furthermore, it was found to be applicable even for powder samples by detecting backward signal.
Hyperspectral Shack-Hartmann wavefront sensing based on a grating with integrated microaxicons is proposed. The capability to detect the spatio-spectral phase of ultrashort pulses is discussed. The generation of arrayed spectra is demonstrated for 10-fs pulses.
90% efficient large aperture tunable optical filters having very narrow spectral width and realized by the incoherent association of a volume Bragg grating and a Fabry-Perot etalon are described and demonstrated.
Noise suppression of 3 dB per pass is demonstrated using a top-implanted passive InGaAsP/InGaAsP multiple quantum well ridge waveguide saturable absorber. The contrast ratio and recovery time are 3 dB and ~16 ps respectively.
A novel multi-line filter using two-dimensional guided mode resonant (2D-GMR) filter is proposed. The locations of resonances are specifically controlled by modifying only the periodicity of the grating and other physical dimensions of the structure.
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