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Device and method for generating broadband noise source based on quantum dot micro-column laser

A broadband noise and laser technology, used in lasers, phonon exciters, laser components, etc., to achieve high-bandwidth effects

Active Publication Date: 2021-03-12
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, due to the introduction of external optical feedback disturbance, such a chaotic light field will have a strong external cavity delay period, which will have a great impact on security in the field of quantum secure communication, such as quantum key distribution, chaotic synchronization, etc. Many researchers are based on suppressing the external cavity delay period of chaotic signals to improve security

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  • Device and method for generating broadband noise source based on quantum dot micro-column laser
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  • Device and method for generating broadband noise source based on quantum dot micro-column laser

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Embodiment

[0088] A method of injecting a narrowband noise signal into a quantum dot laser to generate a broadband noise signal according to the present invention mainly includes the following steps:

[0089] (1) Fabrication of quantum dot microcolumn laser: firstly, a thick gallium arsenide cavity layer is formed by using Bragg reflectors distributed up and down, in which the upper Bragg reflector is made of AlAs / As The lower Bragg reflector is composed of aluminum arsenide / gallium arsenide mirror pairs with a logarithm between 20 and 40. A layer of quantum dots with an area density of ten to the ninth power per square centimeter is doped in the center of the cavity layer as a gain medium. Columnar structures with diameters between 7-15 μm were prepared by high-resolution electron beam lithography and plasma etching. The prepared micro-column samples are placed in a cryostat with a continuous flow temperature setting between T=22.00-30K and a temperature control accuracy of 0.01K. The ...

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Abstract

The invention discloses a device of a method for generating a broadband noise source based on a quantum dot micro-column laser, and belongs to the technical field of broadband noise source generationmethods. The technical problem to be solved is to provide an improvement of a method for generating a broadband noise source based on a quantum dot micro-column laser. According to the technical scheme, the method comprises the steps: preparing a quantum dot micro-column laser serving as a first light source; injecting external narrow-band optical noise into the quantum dot laser prepared in the first step to generate a broadband noise signal, splitting an optical signal output by the quantum dot laser through a beam splitter, converting one path of optical signal into an electric signal through a photoelectric detector, and outputting the electric signal to an oscilloscope and a frequency spectrograph for macroscopic observation; and outputting the other path of the optical signal to a Hanbury-Brown and Twiss interference measurement device to carry out microscopic photon statistical measurement. The method is applied to signal generation, the broadband noise signal generated by the method has the characteristics of high bandwidth and no external cavity period, and the communication safety is improved.

Description

technical field [0001] The invention discloses a device and method for generating a broadband noise source based on a quantum dot microcolumn laser, and belongs to the technical field of generating a broadband noise source based on a quantum dot microcolumn laser. Background technique [0002] Random phenomena such as photon noise, thermal noise in resistors, and frequency jitter in oscillators have been used as physical entropy sources for non-deterministic random number generation. With the advancement of technology, the chaotic signal generated by applying external light feedback and external light injection to semiconductor lasers can also be used as an entropy source of unpredictable random numbers. Due to the high bandwidth and noise-like characteristics of the chaotic signal, the generated random bit rate is significantly improved. However, due to the introduction of external optical feedback disturbance, such a chaotic light field will have a strong external cavity ...

Claims

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Application Information

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IPC IPC(8): H01S5/00H04B10/70
CPCH01S5/005H04B10/70
Inventor 郭龑强郭功名
Owner TAIYUAN UNIV OF TECH
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