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We report on a photonic downsampling receiver architecture for millimeter-wave communication systems. Conversion loss advantage of >16 dB is shown compared to modulator-based photonic downconversion. 3 Gb/s millimeter-wave communication system performance is demonstrated.
To optimize the signal-to-noise ratio (SNR) of a photonically-sampled analog-to-digital converter, we simulate and experimentally verify the pulsed laser response of two commercial-off-the-shelf PIN photodiodes with respect to their 3-dB bandwidths. A 12.3-GHz photodiode showed an SNR advantage of 7.19 dB over a 4.6-GHz photodiode.
We experimentally demonstrate and analyze through simulation an OTDM→WDM serial to parallel converter that fully extracts all 1610-Gb/s WDM channels from a 160-Gb/s OTDM data stream in a single device using an optical Fourier processor. The device operates by dispersing a pump pulse across all OTDM channels and using the nonlinear optical process of four-wave mixing (FWM) to parallelize all channels...
A fully coherent optical code-division multiple access (OCDMA) scheme that combines spectral phase encoding (SPE) and spectral line pairing to generate signals through heterodyne decoding is proposed. A simple balanced receiver performs sourceless heterodyne detection, canceling speckle noise and multiple-access interference (MAI). A 16 user 100% load system transmitting at 40 Gbits is simulated,...
Utilizing a 6-mm-long hydrogenated amorphous silicon nanowaveguide, we demonstrate error-free (BER <; 10-9) 160-to-10 Gb/s OTDM demultiplexing using ultralow switching peak powers of 50 mW. This material is deposited at low temperatures enabling a path toward multilayer integration and therefore massive scaling of the number of devices in a single photonic chip.
We experimentally demonstrate coherent spectral phase encoded optical code-division multiple access that fully suppresses multiple access interference and speckle noise for the first time without the need for fast nonlinear time gating.
Using a temporal Fourier processor, we demonstrate full error-free demultiplexing of a 160-Gb/s OTDM signal with a single nonlinear interaction. Choice of the time-lens aperture is crucial to maximizing the overall system BER performance.
We demonstrate frequency-resolved optical gating using four-wave mixing in a hydrogenated amorphous silicon nanowaveguide. The ultrahigh nonlinearity and the wide conversion bandwidth of this device allow characterization of sub-ps pulses with high sensitivity.
We demonstrate all-optical signal regeneration using a Mamyshev design in a hydrogenated amorphous silicon (a-Si:H) waveguide. Bit-error-rate improvement of 2 dB is achieved with 5.2 W peak power at telecommunication data rates (10 GHz).
We experimentally demonstrate an all-optical sample-and-hold architecture for photonically-assisted ADCs. Our scheme utilizes sub-ps sampling and dispersion to create >100-ps hold pulses and is additionally shown to reduce laser pulse amplitude jitter by 4.2 dB.
We have developed and tested a compact free-hand microsurgical tool-concept based on CP-OCT distance-sensor and 1-D actuation, which is capable of tracking the surface of surgical target tissue and compensating tool-tissue relative-motion with micrometer resolution.
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