All-optical exclusive-OR logic gate structure based on photonic crystal waveguide integration

Abstract

The invention relates to an all-optical exclusive-OR logic gate structure based on photonic crystal waveguide integration. The all-optical exclusive-OR logic gate structure is formed by integrating a photonic crystal W1 waveguide and a photonic crystal W5 waveguide which are special in design. The W1 waveguide forms an input / output channel; the W5 waveguide is used as a multi-mode interference waveguide; and the light intensity of a logic output end is switched between the maximum value and the minimum value by changing the phase of an input signal, so that an exclusive-OR function is realized. An input / output logic value of the all-optical exclusive-OR logic gate structure is determined by the phase of the input signal; a logic value of an output signal is determined by the output light intensity of the logic output end; and therefore, the all-optical exclusive-OR logic gate structure can be used for performing exclusive-OR operation on a binary phase shift keying (BPSK) signal in a BPSK communication system.

Description

technical field [0001] The invention relates to an all-optical XOR logic gate structure based on photonic crystal waveguide integration, and belongs to the technical field of all-optical logic gates. Background technique [0002] With the rapid development of optical communication technology, ultra-high-speed optical signal processing technology is becoming more and more important in optical communication, and at the same time, the equipment requirements for building optical communication systems are also getting higher and higher. All-optical logic gates that directly implement various logic operations in the optical domain can be applied to label switching, data encoding, and optical packet routing in all-optical networks. They are one of the key devices for building all-optical communication systems and realizing all-optical integrated chips one. In particular, ultra-small all-optical logic gate devices are more suitable for the formation of large-scale integrated optica...

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Problems solved by technology

These photonic crystal all-optical logic gates show some advantages, such as high integration, fast response, etc. However, the fully-closed logic gates realized by the nonlinear effect of nonlinear photonic crystals require high operating power, which leads to Logic gates consume a lot of energy, and all-optical logic gates with low energy consumption may be more suitable for the construction of future all-optical integrated circuits; all-optical logic gates using the self-collimation effect of photonic crystals have a simple structure, but are outside the self-collimation frequency domain The light will increase the energy loss of the device, which will greatly reduce the efficiency of the device; using the four-wave mixing effect to realize the all-optical logic gate on the silicon-based photonic crystal slow light waveguide, can realize the ultra-small all-optical logic gate device, However, the transmittance of the device is very low, which increases the energy loss of the device

In 2011, Yuhei Ishizaka, Yuki Kawaguchi, and others proposed an ultra-small photonic crystal all-optical logic gate with low energy consumption (document 7, Yuhei Ishizaka, Yuki Kawaguchi, Kunimasa Saitoh, and Masanori Koshiba, "Design of ultra compact all- optical XOR and AND logic gates with low power consumption,"Opt.Com.284, pp.3528-3533, Apr.2011.), but the model's low error tolerance may limit its application

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