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Fiber optical parametric oscillators (FOPOs) contain multiple longitudinal modes arising from the hundreds of meters to a kilometer scale length of their cavity. To obtain better understanding of the longitudinal modes and to find out how to suppress them, a model for the operation of FOPOs is introduced. This model utilizes the sinusoidal-input describing function (SIDF) as a quasi-linear approximation...
An ultra-fast all optical arbitrary transfer function generator mainly composed of waveguide couplers is proposed. The theory behind this generator is based on the truncated Fourier series. Here we use this approach for implementation of an optical differentiator.
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