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arXiv 2209.02591physics.optics
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通过改变脉冲半导体激光器的泵浦电流实现波分和时分复用--一种量子密钥分发的同步方法

Wavelength- and time-division multiplexing via pump current variation of a pulsed semiconductor laser -- a method of synchronization for quantum key distribution

Roman Shakhovoy, Marius Puplauskis, Violetta Sharoglazova, Elizaveta Maksimova, Selbi Hydyrova, Vladimir Kurochkin, Alexander Duplinskiy

摘要:

半导体激光器波长对泵浦电流的依赖性是公知的现象,其通常归因于由于载流子注入而引起的有源层的折射率的变化。这种效应通常被认为是一个缺点,因为它会导致通过直流调制产生的脉冲的频率啁啾。在这里,我们表明,在高值的热阻的激光二极管,激射波长是红移由于热效应引起的折射率的变化,这种转变可能会显着超过(绝对值)的蓝移有关的折射率变化引起的载流子注入。我们提出利用泵浦电流的变化来调谐波长的能力,并使用相同的激光器来产生不同波长的量子比特和同步光脉冲用于量子密钥分发。为了证明所提出的同步方法,我们进行了数值模拟以及原理验证实验。

英文摘要:

The dependence of the semiconductor laser wavelength on the pump current is a well-known phenomenon, which is generally attributed to a change in the refractive index of the active layer due to carrier injection. This effect is usually considered to be a drawback as it causes frequency chirping of the pulses produced via direct current modulation. Here, we show that at high values of thermal resistance of a laser diode, the lasing wavelength is red-shifted due to the change of the refractive index caused by a thermal effect and this shift may significantly exceed (in absolute value) the blue shift related to a refractive index change induced by the carrier injection. We propose to benefit from the ability to tune wavelength by the pump current variation and use the same laser to generate qubits and synchronization optical pulses for quantum key distribution at different wavelengths. To demonstrate the proposed method of synchronization, we perform numerical simulations as well as proof-of-principle experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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