Design of all-optical half-adder based on nonlinear effect and linear interference effect
doi: 10.37188/CO.EN.2022-0029
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摘要:
结合光子晶体非线性效应和线性干涉效应设计了一种全光半加器。将光源平均分成两部分，对半加器的与门和异或门分开设计。利用非线性效应实现高对比度的与门；利用线性干涉效应实现异或逻辑，从而使器件整体响应速度更快。在这种设计结构下，器件对信号光源功率只有阈值要求，当信号功率大于51.4 mW/μm2时输出稳定，抗干扰能力强。所设计的半加器进位输出端口对比度为20.69 dB，输出端口对比度为20.13 dB。数据传输速率为0.75 Tbits/s,占用面积623 μm2。
Abstract:An all-optical half-adder is designed by combining the nonlinear effect and linear interference effect of photonic crystals. By dividing the light source into two parts equally, the half adder AND gate and XOR gate are designed separately. The nonlinear effect is used to realize the AND gate with high contrast, and the linear interference effect is used to realize the XOR logic, so that the overall response speed of the device is improved. In this design structure, the device only has threshold requirements for the signal light source power. When the signal power is greater than 51.4 mW/μm2, it has stable output and strong anti-interference ability. The designed contrast of the half adder carry output port is 20.69 dB, and the output port contrast is 20.13 dB. The data transfer rate is 0.75 Tbits/s and the occupied area is 623 μm2.
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Key words:
- all-optical half adders /
- ring resonator /
- micro-cavity /
- optical logics /
- linear interference effect
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Figure 1. Characteristics of nonlinear annular cavity. (a) Structure of nonlinear annular cavity. (b) Normalized power of output port in the band of 1.52−1.58 μm
Figure 2. Normalized output port powers at (a) low power incidence and (b) high power incidence
Figure 3. (a) XOR gate structure. (b) Steady state electric field diagram when input is logic '11'
Figure 5. Half-adder normalized power output curve. (a) Input is logical '01'. (b) Input is logical '10'. (c) Input is logical '11'
Figure 7. Steady state diagram of half-adder electric field. (a) Input is logical '01'. (b) Input is logical '10'. (c) Input is logical '11'
Figure 8. Normalized power output curve. (a) Input is logical '01'. (b) Input is logical '10'. (c) Input is logical '11'
Figure 9. Influence of light source power on output. (a) Impact on CARRY output. (b) Impact on SUM output
Table 1. The output parameters of the latter half-adder
Input （Normalized power） Output （Normalized power） A B CARRY SUM 0 1 7.9×10−3 0.512 1 0 7.8×10−3 0.505 1 1 0.926 4.9×10−4 
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