Novel method and model for improving modulation depth of dye doped organic thin film all-optical switch

Abstract

The invention relates to a novel method and a model for improving the modulation depth of a dye doped organic thin film all-optical switch. The method has the following main characteristics that: two linearly polarized light beams which are orthogonal and have a phase difference of 180 degrees are used to excite the switch in an alternating way to speed up a restoration process of the switch, so as to increase the speed and the modulation depth of the switch and increase the speed and modulation depth of the all-optical switch at low exciting power at the same time. The invention also provides a novel all-optical switch model based on the novel method, namely, an orthogonal linearly polarized light excited dye doped organic thin film all-optical switch module. The method has the advantages that: the response speed of the all-optical switch is increased obviously; the modulation depth of the all-optical switch under conditions of a low exciting light power and a high speed switching frequency is obviously improved; and compared with the prior all-optical switch, the orthogonal linearly polarized light excited all-optical switch has a simpler optical path and adjusting method.

Description

technical field [0001] The invention relates to a new method for improving the modulation depth of dye-doped organic thin film all-optical switches. The main feature of the method is to use two orthogonal beams of linearly polarized light with a phase difference of 180° to alternately excite the switch to achieve low excitation power. The purpose of speeding up the switching speed and improving the modulation depth of the switch belongs to the field of photonics. Background technique [0002] Photonic switch is an important device for optical communication and optical information processing, and it is also one of the indispensable components to realize the intelligence of all-optical devices. Because the azobenzene chromophore dye-doped polymer film has strong weak light nonlinear effect and photoinduced birefringence effect, and has the advantages of low production cost, its optical and thermal properties can be adjusted by molecular structure design, etc., Therefore, it h...

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Problems solved by technology

Such as literature 2 (Y.Luo, W.She, S.Wu, et al. Improvement of all-optical switching effect based onazobenzene-containing polymer films [J]. Applied Physics B, 2005, 80: 77-80) for the above For the same sample, under the conditions of switching frequency of 300Hz, linearly polarized light of 13mW and circularly polarized light power of 29mW, although the background signal is greatly reduced compared with the single linearly polarized light excitation condition, the modulation depth of the switch is only up to 20%

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