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IEEE Journal of Quantum Electronics

Optical multistability in the mirrorless electrooptic device with feedback

Masakatsu Okada, Kenji Takizawa

Published Feb 1, 1979• 19 citations
Publisher

Abstract

Optical multistable operations are controllably accomplished in the mirrorless electrooptic device with feedback by arranging the polarizer and/or analyzer at appropriate angles with respect to the crystallographic axes of an electrooptic crystal. Moreover, different operating characteristics in two optical output powers with orthogonal polarizations separated from each other by an analyzer are examined theoretically and experimentally.

DOI
10.1109/jqe.1979.1069965

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Polarization-dependent operation is a serious obstacle in the development of practical photonic devices. In photon-photon devices polarization dependence can arise from different reasons. For example, orthogonal linear polarizations are often used to isolate the two input channels of a three terminal device. In such a case polarization dependence is essential for proper operation of the circuit. Also, in devices where interferometry is used, the polarization of the signal and reference beams must be the same or the interference is incomplete. Schemes such as polarization diversity do not work with nonlinear optical devices, as the interaction is intensity dependent. One successful approach is active polarization control, which requires detection and control circuitry combined with a LiNbO3 electrooptic polarization controller [1]. Active control however, entails extra complexity and expense, and the difficulty involved leads one to the search for simpler schemes.

Nonlinear Optics•Jan 1, 1992•0 citations
Optical multistable operations are controllably accomplished in the mirrorless electrooptic device with feedback by arranging the polarizer and/or analyzer at appropriate angles with respect to the crystallographic axes of an electrooptic crystal. Moreover, different operating characteristics in two optical output powers with orthogonal polarizations separated from each other by an analyzer are examined theoretically and experimentally.
The stability of polarization, areas and number of self- induced transparency (SIT)-solitons on an output the LaF3: Pr3+ sample is theoretically researched versus of the polarization direction and the area of the input linearly polarized laser pulse. For this purpose the Vector Area Theorem is rederived taking into account directions of the dipole matrix element vectors of the six different subgroups of Pr3+ ions. It is shown that there are SIT solitons, which polarizations are directed so between as along the crystallographic axes in the LaF3:Pr3+. For an absorbing medium the interference of these ion's subgroups reduces that SIT-solitons are stable if its polarization is directed between the crystallographic axes. Solitons are nonstable, if its polarization are directed along one of the crystallographic axes: a small change of an input pulse polarization reduces to a soliton splitting up into two separate solitons, which polarizations are directed between the crystallographic axes under an angle +30 and accordingly -30 degrees to the given axis. For an amplifying medium it is just on the contrary.
Polarization-dependent operation is a serious obstacle in the development of practical photonic devices. In photon-photon devices polarization dependence can arise from different reasons. For example, orthogonal linear polarizations are often used to isolate the two input channels of a three terminal device. In such a case polarization dependence is essential for proper operation of the circuit. Also, in devices where interferometry is used, the polarization of the signal and reference beams must be the same or the interference is incomplete. Schemes such as polarization diversity do not work with nonlinear optical devices, as the interaction is intensity dependent. One successful approach is active polarization control, which requires detection and control circuitry combined with a LiNbO3 electrooptic polarization controller [1]. Active control however, entails extra complexity and expense, and the difficulty involved leads one to the search for simpler schemes.