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Arbitrary waveform generation method based on injection locking and nonlinear modulation

A technology of injection locking and generation method, applied in electromagnetic wave transmission systems, electromagnetic transmitters, electrical components, etc., can solve the problems of waveform signal frequency order and flexibility limitations, and achieve the effect of flexible adjustment and good scalability.

Active Publication Date: 2019-12-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the order and flexibility of the waveform signal frequency generated by external modulation are limited.

Method used

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  • Arbitrary waveform generation method based on injection locking and nonlinear modulation
  • Arbitrary waveform generation method based on injection locking and nonlinear modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, have the synthesis of the square wave of high-order spectral component

[0032] The wavelength of the first laser 1 is adjusted to λ1, the wavelength of the second laser 2 is adjusted to λ2, and the light of the two wavelengths is coupled into one path through the first wavelength division multiplexer 3 . After being modulated by a microwave signal of a certain frequency, it is demultiplexed into two paths of light with different wavelengths by the second wavelength division multiplexer 6 . The bias voltage of the modulator 4 is adjusted to make it work at the linear modulation point, and the differential delay line on the branch where the wavelength is λ2 is adjusted so that the delay amount is zero. Adjust the power of the microwave signal to change the amplitude ratio of the first harmonic and the third harmonic to satisfy the relationship of 3:1. At this time, a square wave with third-order spectral components can be obtained. The wavelength of the DF...

Embodiment 2

[0033] Embodiment 2, the synthesis of the triangular wave with high-order spectral components

[0034] On the basis of generating the fifth-order square wave and keeping other conditions unchanged, adjust the amplitude of the modulation signal so that the ratio of the first and third-order frequency components is 9:1. Since the phases of the third harmonic do not match at this time, a polarization delay method needs to be used. Adjust the polarization controller PC4 so that the polarization state of the optical signal with a wavelength of λ2 is 45° to the slow axis of the differential delay line, adjust the optical differential delay line 12 so that one of them introduces a phase difference of π / 2, and the synthesized A third-order triangle wave. Adjust the amplitude of the fifth harmonic generated by the injection locking of the branch where λ1 is located, so that the amplitude ratio of the first and fifth order components is 25:1. After adjusting the phase, couple the two p...

Embodiment 3

[0035] Embodiment 3, synthesis of sawtooth wave and anti-sawtooth wave

[0036] Adjust the differential delay line on the branch where the wavelength is λ2, so that the delay is 0. Adjust the power of the microwave signal to change the amplitude ratio of the first harmonic and the third harmonic to satisfy the relationship of 3:1. At this time, a square wave with third-order spectral components can be obtained. The wavelength of the DFB laser is adjusted so that the modulated secondary sideband just falls into the locking region to generate the second harmonic component. Adjust the amplitude of the second harmonic component so that the ratio between it and the fifth harmonic component generated by the λ2 circuit is 1:2. A sawtooth wave with a third-order frequency component can be obtained after coupling two wavelengths of light through the PD, and an anti-sawtooth wave can be obtained by changing the phase of the second harmonic to make it differ from the first harmonic by π...

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Abstract

The invention discloses an arbitrary waveform generation method based on injection locking and nonlinear modulation. According to the method, injection locking is achieved through a first laser deviceand a DFB laser device with the wavelengths being lambda 1 and lambda 1' and with the wavelengths being lambda 1 and lambda 1' adjustable so as to generate higher harmonics and even harmonics; and the generation and polarization delay of odd harmonics are realized through the nonlinear modulation of light with the wavelength of lambda 2 generated by the second laser. Time domain superposition iscarried out on harmonic components generated by the lambda 1 branch and the lambda 2 branch, and phases and amplitudes are matched, so that one of triangular waves, square waves, sawtooth waves and anti-sawtooth waves with high-order components can be generated. The complexity of a previous multi-waveform generation scheme is reduced by adopting an external modulation mode, higher harmonics are amplified and enhanced through injection locking, and flexible adjustment of frequency components and accurate generation of fixed spectrum components are realized, so that high-order approximate waveforms are obtained. Theoretically, more approximate waveforms can be obtained by adding injection locking branches.

Description

technical field [0001] The invention relates to a system for generating arbitrary microwave signals, in particular to an arbitrary waveform generating system based on a combination of injection locking and modulator nonlinear effects. Background technique [0002] Arbitrary waveform generators play a vital role in radar systems, microwave signal processing such as optical pulse compression and optical sampling, and wired and wireless communication systems. Traditional arbitrary waveforms mainly rely on electronic technology to generate. However, due to the narrow bandwidth of the electronic device itself, weak anti-electromagnetic interference ability, large loss, and poor regenerative ability, the frequency of the waveform is usually limited to within 10GHz. In recent years, researchers have successively proposed many schemes relying on microwave photonic technology to generate arbitrary waveform signals, successfully overcoming the above shortcomings. [0003] Fourier sy...

Claims

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Application Information

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IPC IPC(8): H04B10/50H04B10/54H04B10/556H04B10/564
CPCH04B10/505H04B10/541H04B10/5563H04B10/564H04B10/5561
Inventor 于晋龙彭海涛王菊马闯
Owner TIANJIN UNIV
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