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Using optical fiber to retrieve signals from remote sensors has several advantages compared to remoting by means of metallic waveguides such as coaxial cable. Fiber-optic retrieval of an RF signal can be achieved by down-converting and digitizing the signal for conveyance by a digital fiber-optic link, or it can be achieved by conveying the RF signal over an analog fiber-optic link before digitization...
Historically, analog fiber optic links have been designed with the goals of high linearity and low noise. Rather than avoid all nonlinear effects, we consider ways that optical nonlinearities can enhance the performance of a microwave optical link, and describe two specific examples.
Four-wave mixing in a two-channel WDM system operating near the fiber dispersion zero is found to cause crosstalk and distortion of subcarrier-multiplexed signals. We model the effect and find good agreement with measured data.
The time-varying state of polarization of an optical channel modified by the intensity of other channels in a three-channel WDM system is measured. It compares well with theory expanded from a previously published two-channel model
We analyze the performance of a feed-forward linearized transmitter in terms of clipping distortion. With electrical filtering it can produce an output RMS modulation depth of 28.0%, compared to 22.0% of a basic transmitter.
Using a high-speed polarimeter, we measure RF changes in the state-of-polarization induced by nonlinear and linear crosstalk in a lightwave communication system. Our experimental results show good agreement with a basic theoretical model.
Parallel computing was applied to the solution of an inverse problem arising from a hyperbolic system of two coupled linear first-order partial differential equations. A known sequential algorithm based on the method of invariant imbedding was parallelized by a mapping assigning processors to characteristics. Two implementations of an algorithm based on this mapping and suitable for a message-passing...
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