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We report RF-spectrum analysis of optical signals based on cross-phase-modulation in a silicon-rich nitride waveguide. Measurements show a bandwidth of at least 560 GHz for our RF-spectrum analyzer. RF-spectra measurements for pulse trains at rates from ∼ 10 GHz to ∼ 160 GHz are demonstrated.
We combine dual-comb interferometry with coherent nonlinear spectral broadening. We show high-speed (sub-millisecond) mode-resolved electric-field complex measurements of 25 GHz electrooptic frequency combs spanning the whole C band (1530–1565 nm).
We present a high power, broadly tunable, optoelectronic frequency comb generator. The device produces between 60-75 lines within 10dB bandwidth over its tuning range, from 6-18 GHz, and can handle 1W of optical input power.
Optical frequency comb generators, when combined with line-by-line pulse shaping, allow for the synthesis of programmable microwave photonic phase filters. The filter's achievable time-bandwidth product is related to the number of comb lines that can be individually manipulated. In this contribution, we present a flat ultra-broad optical frequency comb generator based on external non-linear broadening...
In this contribution we show that the high degree of spectral coherence in high-repetition-rate optical frequency combs enables simultaneous downconversion of broadband microwave signals and programmable multi-tap complex-coefficient filtering in the intermediate frequency (IF) band. Our results demonstrate programmable filtering and tuning within 5 GHz IF bandwidth using a 20-tap 10 GHz opto-electronic...
We perform photonic downconversion of microwave signals using an optical frequency comb in a dispersive-delay-line geometry. Programmable analog filtering in the 0–5GHz IF band is achieved through optical arbitrary waveform generation.
We demonstrate programmable control of a pulse shaper that achieves both fine resolution and broad bandwidth operation by dispersing light into two dimensions. We show line-by-line pulse shaping at 5 GHz in a closed-loop configuration.
We demonstrate switching at the clock rate among four different optoelectronic frequency combs. After processing them with a 2D pulse shaper, this scheme enables temporal multiplexing of arbitrary radio-frequency signals.
We discuss research at Purdue University in which ultrafast optical signal processing approaches are adapted for generation, processing, and compression of ultrabroadband RF electrical signals.
We report on a 4-channel radio-frequency arbitrary waveform generator, capable to switch within a clock period among synthesized radio-frequency arbitrary waveforms. The system works by combining an original switching scheme of time-multiplexed multi-wavelength optical frequency combs with a two-dimensional line-by-line pulse shaper featuring broad bandwidth operation over large temporal windows....
We demonstrate holographic reconstruction of the wave field scattered by the sample through second-order intensity correlation of interference patterns and phase-shifting algorithms. The system offers the possibility to record holograms with a single-pixel sensor when the spckle is generated with a spatial light modulator.
Ghost imaging (GI) is a novel technique where the optical information of an object is encoded in the correlation of the intensity fluctuations of a light source. Computational GI (CGI) is a variant of the standard procedure that uses a single bucket detector. Recently, we proposed to use CGI to encrypt and transmit the object information to a remote party [1]. The optical encryption scheme shows compressibility...
We use OptiSystem to demonstrate a technique to make Real-Time Radio Frequency Spectrum measurements through the combination of cross phase modulation, and the time domain analog to Fraunhofer Diffraction.
The capabilities for RF-AWG in terms of waveform fidelity for three different incoherent photonic methods are revised and discussed: incoherent frequency-to-time mapping, incoherent MWP filtering with N discrete taps, and multi-wavelength pulse compression.
We propose an arbitrary radio-frequency waveform generator with high-speed switching capabilities. As a proof-of-principle demonstration, we design a two-tap filter with Gb/s transitions between triangle and square waveforms with ~12 GHz bandwidth content.
In this work, we consider nonlocal dispersion cancellation with classical light in a setup. We demonstrate that the dispersion cancellation phenomenon of temporally entangled two-photon states of light in continuous-wave (CW) pumped SPDC can be similarly obtained in intensity interferometry with classical, stationary radiation that obeys Gaussian statistics. Specifically, we show that the correlation...
An RF waveform generator operating with incoherent broadband light is successfully implemented. Complex RF ~10 GHz bandwidth waveforms are generated by means of incoherent wavelength-to-time mapping. Our technique can be scaled to the mm-wave range.
An RF waveform generator operating with incoherent broadband light is successfully implemented. Complex RF ~10 GHz bandwidth waveforms are generated by means of incoherent wavelength-to-time mapping. Our technique can be scaled to the mm-wave range.
Recently, an nil-optical technique to generate arbitrary RF waveforms through Altering of the spectral density function of a broadband spectrally incoherent optical source has been introduced. The spectrum is tailored so that the output averaged intensity after large temporal modulation and subsequent distortion in a group-delay-dispersion circuit becomes the user-defined waveform. In general, there...
A numerical simulation for the generation of a sine square smoothed with a Gaussian waveform is performed. The broadband spectrally incoherent source is the incoherent radiation emerging from an erbium-doped fiber amplifier.
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