A multi-channel broadband random signal generation device based on a micro-ring resonator

Abstract

This invention belongs to the field of communication technology, specifically relating to a multi-channel broadband random signal generation device based on a micro-ring resonator, comprising a superluminescent diode, an erbium-doped fiber amplifier, a polarization controller, a micro-ring resonator, and a wavelength division multiplexer (WDM). Its key feature is that the amplified spontaneous emission noise emitted by the superluminescent diode is amplified to a certain power by the erbium-doped fiber amplifier and then pumps the micro-ring resonator. In the ring waveguide of the micro-ring resonator, a combination of four-wave mixing, self-phase modulation, cross-phase modulation, stimulated Raman scattering, and dispersion occurs. The output from the micro-ring resonator outputs an optical frequency comb with n teeth. The WDM demultiplexes these n teeth, ultimately generating n high-bandwidth random signals. This invention solves the problem of the difficulty in realizing multi-channel broadband random signals and can be applied to communication systems, radar, and cryptography.

Description

Technical Field

[0001] This invention relates to a multi-channel broadband random signal generation device based on a micro-ring resonator, belonging to the fields of cryptography, communication, and information security. Background Technology

[0002] Random signals have been widely used in fields such as secure communications, radar, and cryptography. In secure communications, random signals serve as carrier waves to conceal information; in radar, random signals, as transmitted signals, enable radar systems to possess excellent low probability of intercept performance and electronic countermeasures capabilities; in cryptography, random signal sources can serve as entropy sources for generating physical random numbers.

[0003] Currently, most random signal generation devices are based on electronic random processes. Typical electronic random signal generation devices utilize resistor thermal noise, phase jitter of ring oscillators, circuit metastability, and chaotic circuits. However, the bandwidth of the random signals generated by traditional electronic random signal generation devices is only on the order of MHz, which is far from meeting current application requirements. In addition, electronic random signal generation devices often require the use of electrical amplifiers to amplify the output random signal, making the entire system relatively complex. Moreover, as the bandwidth of the electronic random signal increases, the flatness of its output power spectrum deteriorates.

[0004] Utilizing optical random processes to construct random signal generation devices can overcome the bottleneck of electronic bandwidth and achieve broadband random signal generation. Typical optical random signal generation devices utilize laser phase noise, amplified spontaneous emission noise, and chaotic lasers. For example, phase noise based on a vertical-cavity surface-emitting laser can generate optical random signals with a bandwidth of nearly 1 GHz [Physical Review E, 2010, 81(5), 051137]; broadband random signals with a bandwidth of approximately 12 GHz can also be generated using superluminescent diodes combined with photoelectric conversion devices [Optics Letters, 2011, 36(6), 1020-1022]; and chaotic lasers generated by semiconductor lasers with external feedback can be used as optical random signal sources with a bandwidth of approximately 1.7 GHz [Nature Photonics, 2008, 2(12), 728-732]. Compared to electrical random signals, the above optical random signals have a significantly enhanced bandwidth. However, the aforementioned optical random signal generators can typically only output single or dual random signals, which cannot meet the current application requirements for multi-channel parallelization, such as multi-channel secure communication, multi-target radar detection, and multi-channel parallel Monte Carlo simulation.

[0005] In conclusion, in order to simultaneously meet the current application requirements for high bandwidth and parallelization, it is essential to develop a new type of multi-channel broadband random signal generation device. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-channel broadband random signal generation device based on a micro-ring resonator, which solves the problem of difficulty in realizing multi-channel parallel broadband random signals in the prior art.

[0007] This invention provides a multi-channel broadband random signal generation device based on a microring resonator, comprising a superluminescent diode, an erbium-doped fiber amplifier, a polarization controller, a microring resonator, and a wavelength division multiplexer connected in sequence. The superluminescent diode emits amplified spontaneous emission (ASE) noise, which is then amplified by the erbium-doped fiber amplifier. After amplifying the ASE noise to a certain power, the polarization state is adjusted by the polarization controller before being injected into the microring resonator. The amplified ASE noise undergoes a combination of four-wave mixing, self-phase modulation, cross-phase modulation, stimulated Raman scattering, and dispersion in the microring resonator, resulting in significant spectral broadening. The download port of the microring resonator outputs an optical frequency comb with n equally spaced frequency teeth in a modulated unstable state. Finally, the wavelength division multiplexer demultiplexes the n teeth of this optical frequency comb into n high-bandwidth random signals.

[0008] In the multi-channel broadband random signal generation device based on a micro-ring resonator described in this invention, the center wavelength of the superluminescent diode must be less than the wavelength corresponding to the nearest resonant frequency, that is, the pump wavelength must be located at the blue detuning point of the resonant peak of the micro-ring resonator.

[0009] In the multi-channel broadband random signal generation device based on a micro-ring resonator described in this invention, the number of output channels of the wavelength division multiplexer is equal to the number of comb teeth of the optical frequency comb output from the micro-ring resonator download end.

[0010] In the multi-channel broadband random signal generation device based on a micro-ring resonator described in this invention, the channel bandwidth of the wavelength division multiplexer should be greater than the linewidth of a single comb tooth of the optical frequency comb.

[0011] The advantages and positive effects of the multi-channel broadband random signal generation device based on a micro-ring resonator provided by the present invention are as follows:

[0012] 1. This technical solution uses optical methods to generate broadband random signals, breaking through the electronic bandwidth bottleneck, and its spectral bandwidth can be increased by 2 to 3 orders of magnitude;

[0013] 2. The number of broadband random signals generated by this technical solution can be further expanded. By increasing the amplification power of the erbium-doped fiber amplifier or using a micro-ring resonator with a higher nonlinear coefficient, the number of comb teeth of the optical frequency comb can be further increased, thereby realizing the generation of more broadband random signals.

[0014] 3. The power of the random signal output by this technical solution depends on the amplification power of the erbium-doped fiber amplifier. Compared with existing electronic random signal generators, its output power is easier to adjust and can output a larger maximum power. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a multi-channel broadband random signal generation device based on a micro-ring resonator provided by the present invention.

[0016] Figure 2 The transmission characteristic curve of the microring resonator download end in a multi-channel broadband random signal generation device based on a microring resonator provided by the present invention is shown.

[0017] Figure 3 The typical spectrum of the optical frequency comb output from the download end of the microring resonator in a multi-channel broadband random signal generation device based on a microring resonator provided by the present invention.

[0018] Figure 4 To be Figure 3 The typical spectrum of the optical frequency comb after filtering out individual comb teeth is shown in the image. Detailed Implementation

[0019] The technical measures of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer understanding of the purpose, advantages, and technical measures of the present invention. Based on the embodiments of the present invention, any other embodiments obtained by other skilled in the art without creative effort can be classified within the protection scope of the present invention.

[0020] This invention provides a multi-channel broadband random signal generation device based on a micro-ring resonator, comprising a superluminescent diode 1, an erbium-doped fiber amplifier 2, a polarization controller 3, a micro-ring resonator 4, and a wavelength division multiplexer 5. The amplified spontaneous emission (ASE) noise emitted by the superluminescent diode 1 is input to the erbium-doped fiber amplifier 2 for amplification. After the erbium-doped fiber amplifier 2 amplifies the ASE noise to a certain power, it is injected into the micro-ring resonator 4 after the polarization state is adjusted by the polarization controller 3. The amplified ASE noise undergoes a combination of four-wave mixing, self-phase modulation, cross-phase modulation, stimulated Raman scattering, and dispersion in the micro-ring resonator 4, resulting in significant spectral broadening. The download port of the micro-ring resonator 4 outputs an optical frequency comb with n equally spaced frequency teeth in a modulated unstable state. Finally, the wavelength division multiplexer 5 demultiplexes the n teeth of this optical frequency comb into n high-bandwidth random signals.

[0021] In specific implementation, see attached Figure 1The superluminescent diode 1 shown outputs ASE noise with a center wavelength of 1053 nm and a spectral linewidth of 30 nm. Erbium-doped fiber amplifier 2 amplifies the ASE noise signal to 10 W. The amplified signal is then injected into the microring resonator 4 after its polarization state is adjusted by polarization controller 3. Figure 2 As shown, the resonant linewidth of the microring resonator 4 is 0.3 nm, and its nonlinear coefficient is 1 W⁻¹m⁻¹. The resonant wavelength closest to the pump light is 1053.02 nm. The ASE noise signal in the microring resonator 4 is first subjected to four-wave mixing, causing the timing to be compressed into multiple short pulse signals. These short pulse signals are further split into optical solitons by self-phase modulation, Raman scattering, and higher-order dispersion, resulting in spectral broadening towards longer wavelengths. Simultaneously, the optical solitons generate dispersive waves under perturbations such as higher-order dispersion, which broaden the spectrum towards shorter wavelengths. The cross-phase modulation between the solitons and the dispersive waves further broadens the spectrum at shorter wavelengths. In summary, the combined effect of nonlinearity and dispersion in the microring leads to the generation of many new frequency components in the original chaotic laser, resulting in a significant broadening of the spectral range. The spectrum of the final signal output from the download port exhibits a series of comb-like patterns with the same frequency spacing, such as... Figure 3 As shown in the figure, mode 0 represents the comb teeth corresponding to the pump light wavelength, with m comb teeth symmetrically distributed on both sides, where the value of m can be greater than 100. Furthermore, a wavelength division multiplexer 5 with a channel bandwidth of 0.3 nm and n channels demultiplexes the generated optical frequencies into n high-bandwidth random signals (n = 2m + 1). Figure 4 As shown, the measured spectral -3dB bandwidth of each broadband random signal reaches 50GHz.

[0022] It should be particularly noted that the output power of the broadband random signal generated by this invention can be adjusted by regulating the amplification power of the erbium-doped fiber amplifier 2. Furthermore, the number of broadband random signals generated by this invention is related to the amplification power of the erbium-doped fiber amplifier 2 and the nonlinear coefficient of the microring resonator 4. Different numbers of broadband random signals can be generated by adjusting the amplification power or replacing the microring resonator 4 with a different nonlinear coefficient, thus enabling applications in multi-target radar detection, multi-channel high-speed secure communication, and multi-channel random number generation.

[0023] The above description is merely a detailed description of the technical measures of the present invention to facilitate understanding by those skilled in the art, but it is by no means a limitation on the scope of protection of the present invention. For those skilled in the art, direct or indirect application to other related scientific and technological aspects in various equivalent forms or methods also falls within the scope of patent protection of the present invention.

Claims

1. A multi-channel broadband random signal generation device based on a microring resonator, comprising a superluminescent light-emitting diode, an erbium-doped fiber amplifier, a polarization controller, a microring resonator, and a wavelength division multiplexer connected in sequence; wherein, Amplified spontaneous emission (ASE) noise emitted by a superluminescent diode is input to an erbium-doped fiber amplifier for amplification. After the erbium-doped fiber amplifier amplifies the ASE noise to a certain power, it is injected into a microring resonator after the polarization state is adjusted by a polarization controller. The amplified ASE noise undergoes a combination of four-wave mixing, self-phase modulation, cross-phase modulation, stimulated Raman scattering, and dispersion in the microring resonator, resulting in a significant spectral broadening. The download port of the microring resonator outputs an optical frequency comb with n equally spaced comb teeth in a modulated unstable state. Finally, the n comb teeth of the optical frequency comb are demultiplexed into n high-bandwidth random signals by a wavelength division multiplexer.

2. The multi-channel broadband random signal generation device based on a micro-ring resonator as described in claim 1, characterized in that: The center wavelength of a superluminescent diode must be smaller than the wavelength corresponding to the nearest resonant frequency, that is, the pump wavelength must be located at the blue detuning point of the resonant peak of the micro-ring resonator.

3. The multi-channel broadband random signal generation device based on a micro-ring resonator as described in claim 1, characterized in that: The number of output channels of a wavelength division multiplexer is equal to the number of teeth of the optical frequency comb output from the micro-ring resonator.

4. The multi-channel broadband random signal generation device based on a micro-ring resonator as described in claim 1, characterized in that: The channel bandwidth of a wavelength division multiplexer should be greater than the linewidth of a single comb tooth in an optical frequency comb.

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