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High repetition rate frequency combs and pulse trains are generated from continuous-wave lasers either by strong electro-optic modulation or by nonlinear wave mixing in microresonators. Applications to optical and RF arbitrary waveform generation and signal processing are discussed.
We demonstrate picosecond optical pulse generation based on a directly generated 10 GHz Gaussian-shaped optical frequency comb using only intensity and phase modulators. The quadratic comb phase allows for pulse compensation with only single-mode fibers.
We present reconfigurable microwave photonic filtering with unprecedented 40 ns tuning speed based on dual electro-optically generated combs. The combs are derived from a single laser and are directly shaped for good filter selectivity.
We demonstrate a simple scheme which uses only an intensity modulator and an OSA to achieve low-power (∼100nW, 10aJ/pulse at 10GHz), self-referenced, amplitude and phase characterization of high repetition rate optical frequency comb sources.
The performance of asynchronous coherent time-spreading OCDMA systems is evaluated semi-analytically and the results are compared with those of spectral coding OCDMA systems using ultra-short pulses. The fundamental multi-access interference limited performances are predicted to be identical.
In summary we demonstrate the application of programmable microwave photonic phase filters to compensate a broadband antenna dispersion at a receiver front which enables to increase data rate by overcoming distortion due to antenna nonlinear spectral phase. We also show that dispersion-compensation combined with matched filtering arbitrary waveforms can be used in waveform detection. Our scheme is...
We use dual-quadrature spectral interferometry to demonstrate single shot amplitude and phase retrieval of shaped waveforms generated from a 10 GHz optical frequency comb and switched at the repetition rate of the frequency comb.
We demonstrate ultra-compact spectral shaping via thermo-optically tunable multiple-channel microring resonators on a silicon chip, and combine it with frequency-time mapping to achieve photonic radio-frequency arbitrary waveform generation (RFAWG).
A self-referenced technique for measuring the phase of individual optical frequency comb lines is demonstrated. Spectral frequency shear is obtained from sum frequency generation of a signal comb with wavelength separated reference tones.
We demonstrate fast (~1.4 mus) spectral amplitude and phase characterization of optical arbitrary waveforms generated by line-by-line shaping of a 10 GHz frequency comb. Our technique enables coherent spectral phase measurement after dispersive propagation over long (~50 km) lengths of optical fiber.
We present a novel technique for electric field cross-correlation using two frequency combs. This technique is for characterization of optical arbitrary waveforms and allows independent control of phase and group delay without a mechanical stage.
Optical combs and high-resolution optical filtering are utilized for high-fidelity measurements of photodiode harmonic distortion. This new technique uses a single laser and phase modulation-alleviating requirements on laser frequency stabilization and modulator bias control.
We demonstrate that imaging through thick random media can be facilitated by intensity correlations with respect to input beam location. Example results suggest that the approach could lead to new imaging opportunities.
We demonstrate broadband antenna dispersion compensation and matched-filtering using microwave photonic filters implemented by optical pulse shaping. We compensate undesirable dispersion to overcome distortion introduced by nonlinear spectral phase and perform matched-filtering for waveform identification.
We demonstrate fast retrieval(<1.5 mus) of amplitude and phase of optical frequency combs propagating over long lengths of optical fiber(> 50 km) and of user defined pulse shapes representing higher order propagation effects using dual quadrature spectral Interferometry.
We demonstrate ultra-compact spectral shaping via thermo-optically tunable multiple-channel microring resonators on a silicon chip, and combine it with frequency-time mapping to achieve photonic radio-frequency arbitrary waveform generation (RFAWG).
We demonstrate matched filtering of ultrawideband radio frequency waveforms via programmable optical phase filters implemented in a hyperfine resolution pulse shaper. As an example we demonstrate compression of frequency modulated and pseudorandom sequence waveforms.
We demonstrate an original method to analytically retrieve complete spectral phase of ultrashort pulses by measuring two modified interferometric field autocorrelation traces using thick nonlinear crystals with different central phase-matching wavelengths.
We demonstrate line-by-line pulse shaping of enhanced number of frequency comb lines (~500, limited by the number of lines available from source) having a repetition rate of 10 GHz using a 2-D VIPA grating pulse shaper.
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