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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.
We present operation of an optical phase-sensitive amplifier (OPSA) in a RF-photonic link for improved link performance. Enhancement of 3.5dB in OIP3 and 2.5dB.Hz2/3 in SFDR at net OPSA gain of 5dB is observed.
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 have observed third-harmonic generation by single nanorods in solution and investigated its excitation polarization dependence. Our findings demonstrate the possibility of using third-harmonic signals for correlation spectroscopy, in contrast to conventional fluorescence correlation spectroscopy.
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