Download PDF by N. K. Bose (auth.), M. A. Fiddy, M. Nieto-Vesperinas (eds.): Optical Signal Processing
By N. K. Bose (auth.), M. A. Fiddy, M. Nieto-Vesperinas (eds.)
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Extra resources for Optical Signal Processing
Next, a photorefractive crystal waveguide (PCW) is investigated. The waveguiding characteristics of PCW, holography of Fourier transformed image in PCW, and two-dimensional (2-D) array ofPCW as a storage device and its application to optical neural network, and phase conjugate mirror using PCW, are presented. Finally, the structural consideration of PCW for efficient 2-WM is discussed. In the experiments, LiNb0 3 and BaTz03 waveguides are used. BaTz03 , cleaved out of the bulk crystal, will be tested here for the first time.
Rex, y) = [afN(x, y) + bgN(x, y)] Ix li27rN-1I2 (7) where a and b are complex constants found by solving the following matrix equation: (8) R, and R2 are the outputs required when the inputs are f(x, y) and g(x, y) respectively and CjjN' CggN , CfgN , CgfN are the central (0, 0) value of the crosscorrelation between f and g and their Nth logarithmic harmonic respectively. In most practical cases R, and R2 are 1 and 0 respectively. One should note that a composite logarithmic harmonic may contain more than two images, but to conserve the aspect view invariance property, all the terms must be related to the same harmonic order.
This is seen from Figure 10 that by comparing the case withf = 1000 mm in (a), the edge of the image with the case of shorter focal lengthf = 300 mm in (c) becomes clearer. However, the image in (d) for much shorter focal length shows a degradation of image fidelity. It is presumed that the high frequency components excite higher-order guided modes of the fiber. This causes the phase noise in the reconstructed image due to the modal phase dispersion. Therefore, once a fiber length and a diameter are given, a compromise has to be made to set the cutoff value for a spatial frequency to obtain the best fidelity.
Optical Signal Processing by N. K. Bose (auth.), M. A. Fiddy, M. Nieto-Vesperinas (eds.)