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Intermediate results from a project to deliver 100 Gb/s communication links over ranges of 100 to 200 km in air-to-ground or air-to-air environments are described.
In this work, the signal-to-noise ratio improvement of photonic lantern-based coherent receivers over single-mode coherent receivers is demonstrated. The signal-to-noise ratio is improved by a factor of 2.8 when other parameters kept constant.
Technologies useful in optical communications, particularly coherent methods and nonlinear optics, are also applicable to signal processing in other domains. Interrelationships between the two fields in these areas will be reviewed, including some recent results.
This talk will discuss opportunities for photonics to contribute to signal processing applications in general, and RF signal processing in particular. Key issues associated with embedded photonic links, important analog RF functions, and key component and systems requirements will be addressed. Progress in silicon photonics and associated systems technologies, along with basic proof of concept demonstrations...
High dynamic range is a key requirement in analog applications. In multichannel optical signal processing applications, a wideband radio-frequency signal suffers from distortion from both in-channel and out-of-channel signals due to nonlinear modulator behavior. We demonstrate experimentally the compensation of nonlinearities occurring due to out-of-channel “cross-modulation” with a novel predistortion...
We present the compensation of nonlinearities due to cross-modulation for high dynamic range in RF channelization applications using a novel predistortion method. Simulations show that the cross-modulation nonlinearity, a key limitation, can be suppressed by more than 30dB.
We demonstrate a wavelength-tunable optical channelizing filter with a high extinction ratio (50 dB), a narrow bandwidth (2.4 GHz), and a large free spectral range (50 GHz) using high-order coupled silicon rings.
We experimentally demonstrate compensation of nonlinearity due to cross-gain modulation in wideband analog systems employing narrow-band optical filtering, which is essential for multi-channel optical signal processing in RF channelizer applications.
We demonstrate the first reconfigurable, cascadable silicon photonics unit cell fabricated in commercial wafer-scale processes using a single 500 ps delay line and allowing independent FIR and IIR response for high-resolution RF filtering and correlation applications.
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