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Utilizing the amplification/de-amplification modes of a phase-sensitive amplifier, we implement a notch filter with extinction ratios given by amplifier gain squared. Bit error rate measurements demonstrate highly effective isolation of a signal-of-interest from neighboring interferers.
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.
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 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.
The quest for ever-greater situational awareness creates a need for continuous improvement in signal processing technology. Avionic platforms present a particularly challenging host platform in terms of size, weight, and power (SWaP), with RF signals a major area of interest. Decades of unbroken exponential progress in underlying microelectronics technology combined with the flexibility of programmable...
We experimentally demonstrate a novel multiscale sampling technique for extending the dynamic range of a phase-modulated analog optical system employing passband signals by 20 dB. Envelope distortion is compensated using digital post-processing.
We experimentally demonstrate an OSNR monitoring technique for 80-Gb/s polarization-multiplexed RZ-DPSK utilizing narrowband optical filter and RF spectrum analysis. Maximum RF power increment of 19.7 dB, insensitive to CD and PMD, is measured for monitoring of OSNR up to 27 dB.
All-Raman transmission of 128times42.7 Gb/s at 50 GHz channel spacing over 1280 km of standard single-mode fiber is demonstrated. This record capacity for this high spectral efficiency is achieved by strong filtering of carrier-suppressed return-to-zero signals
The first experimental determination of the limitations of monitoring OSNR using the optical spectrum is provided for 10 and 40 Gb/s networks with high spectral efficiency and optical add-drop multiplexers.
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