6,101 research outputs found
Amplitude and timing jitter analysis of periodic phase filters for optical pulse rate multiplication
No full textReconfigurable single-shot incoherent optical signal processing system for chirped microwave signal compression
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Reconfigurable and Single-Shot Chirped Microwave Pulse Compression Using a Time-Spectrum Convolution System
No full textProgrammable all-fibre optical pulse shaper based on time-domain binary phase-only linear filtering
No full textA 0-40 GHz RF tunable receiver based on photonic direct conversion and digital feed-forward lasers noise cancellation
No full textThis paper presents the architecture of a compact, robust, and broadly tunable RF receiver based on photonic direct conversion and digital feed-forward lasers noise cancellation. In the proposed solution, the incoming RF signal is filtered and down converted to baseband by means of an optical direct conversion (i.e., I/Q) receiving scheme (named here as signal receiver) fed by two free-running semiconductor lasers. At the same time, the beat noise of the free-running lasers is acquired by a second down-converter (reference sensor) fed by the same lasers. Then, the noise information is used by the digital feed-forward noise cancelling algorithm to enhance the frequency resolution provided by the signal receiver. The proposed strategy avoids complex lasers feedback-locking mechanisms, such as electrical/optical phased-locked loop or optical injection locking, as well as bulky RF components such as filters banks and synthesizers. An experimental validation shows an RF input range of 0-40 GHz, instantaneous bandwidth of 2 GHz, carrier noise of ∼-120 dBc/Hz (@ 4 kHz), out-of-band rejection >80 dB, and tuning response <10 μs. Implementing the scheme through integrated photonics technologies should enable increased environmental stability and a chip-scale form factor
Real-time group-delay monitoring of ultra-broadband dispersive devices by incoherent light interferometry
No full textMHz update-rate reflectometry by direct mapping of the full axial-line profile in a single-shot oscilloscope trace
No full textFINANCING COMMUNITY FACILITIES: A CASE STUDY OF THE PARKS AND RECREATIONAL GENERAL OBLIGATION BOND MEASURE OF SAN JOSE, CALIFORNIA
No full textThis study of the City of San Jose’s Parks and Recreation General Obligation (GO) Bond Measure seeks to identify the politics-, management-, and planning-related lessons learned by the City as it developed its community facilities using the GO bonds proceeds. The study finds that these lessons include: be conservative in what you promise the residents; be prepared for changes in economic environment by identifying supplementary funding sources should the primary source not yield adequate funds; make sure that the jurisdiction is organizationally capable of handling the increased workload; and prepare detailed project plans prior to the bond issuance.Community Infrastructure and Services; Municipal Bonds; Public Finance
Reconfigurable Optical Fiber-Based Microwave Dispersive Line for Single-Shot Chirped Microwave Pulse Compression
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