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In future networks, very-high-speed and high-capacity di-rect optical switching systems will play a very importantrole, and an optical switching device is considered to be akey device for the construction of such high-speed opticalswitching systems or photonic integrated circuits[1]. Soit is imperative for optical switching device to search fora material with high-speed and large field-induced re-fractive index change in the case of low absorption loss.It is well known that a large electric fi… 相似文献
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An optically activated optical switch based on suppression of mode interference (SMI) is presented. The imaging properties of multi-mode interference (MMI) section in the switch with Y-branch can be modified by a controlling light injection. The switch was simulated by finite difference beam propagation method (FD-BPM) and fabricated on GaAlAs/GaAs epitaxial materials. At the wavelength of 1.31 μm, the primary experiment showed an extinction ratio of about 8 dB with controlling light power density of 73.5 W/mm2. 相似文献
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Steering light into logic patterns with two-dimensional cascaded
multimode waveguide is demonstrated. By employing the imaging
properties of 2D multimode interference (MMI) and partial phase
modulation method, the design ideas and the implementing methods of
the 2(2×2) bits type spatial logic steering are discussed;
therefore the structure of logical pattern is proposed. Numerical
simulation is carried out to verify the design in detail by using the
beam propagation method. It is expected to realize logic coders by
using the integrated optical methods and exploit their potential
applications in the field of optical logic. 相似文献
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圆孔“衍射波”的相位特性 总被引:2,自引:2,他引:0
在标量衍射理论的基础上,导出了圆孔衍射的“边界衍射波”的级数表达式,提出圆孔衍射产生的“衍射波”概念,对“边界波”和“衍射波”的相位特性作了讨论和比较. 相似文献
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In this Letter, we study the characteristics of a selectively buried glass waveguide that is fabricated by the backside masking method. The results show that the surface region appears when the width of the backside mask is larger than 7 mm. Here, the glass substrate is 1.5 mm thick. It is also found that the buried depth evolution of the transition region remains almost unchanged and is independent of the width of the backside mask. The loss of the transition region is only 0.28 d B at the wavelength of 1.55 μm if the surface condition is good enough. 相似文献