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- 2017
扰动信号强度对VCSEL光子神经Spiking动力学特性的影响
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Abstract:
理论研究了外部光注入下1 300 nm-VCSEL光子神经的spiking动力学特性. VCSEL在足够强的连续光注入下工作在稳定的注入锁定态; 在注入光中引入扰动信号后，当扰动信号强度较小时，VCSEL不能激发spike信号; 一旦扰动信号强度达到一定水平，VCSEL将激发出稳定的、可重复的spike信号，且spike信号的幅值和形状几乎不随扰动信号强度的变化而变化，但其响应速率却随扰动信号强度的增加而增大. VCSEL光子神经的这种阈值响应特性与生物神经的全或无响应特性类似，但其响应速率却比生物神经快约8个量级.
The spiking dynamics of 1 300 nm-VCSEL (Vertical Cavity Surface Emitting Laser) photonic neuron subjected to external optical injection has been theoretically investigated. Under continuous light injection with enough strength, VCSEL operates at a stable injection locking state. After introducing perturbation to continuous injection light, for relative weak perturbation, the strength of perturbation is not high enough to yield a spike response from VCSEL. Once the strength of perturbation exceeds a certain level, stable and repeatable spikes will be fired. Moreover, the spiking signals obtained from VCSEL have a similar level and shape once spiking activity is triggered independently of the strength, while the repetition rate increases with increasing perturbation strength. The threshold response characteristics of VCSEL photonic neuron is similar to that of all-or-none spike firing response in biological neurons, but is faster by 8 orders-of-magnitude
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