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Method and device improving microwave signal time stretching linearity

A microwave signal and time-stretching technology, which is applied in optics, instruments, optical analog/digital converters, etc., can solve problems such as the lack of linearization methods for broadband optical time-stretching systems, improve linearity and dynamic range, and eliminate Third harmonic and third order intermodulation distortion, effects of increased sensitivity

Inactive Publication Date: 2016-08-10
成都卓力致远科技有限公司
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AI Technical Summary

Problems solved by technology

For broadband TS-ADC systems, it should be considered to suppress the third-order intermodulation distortion while eliminating low-order harmonics. However, so far, there is still no linearization method for broadband optical time-stretching systems.

Method used

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  • Method and device improving microwave signal time stretching linearity
  • Method and device improving microwave signal time stretching linearity
  • Method and device improving microwave signal time stretching linearity

Examples

Experimental program
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Embodiment

[0035] Combine below figure 1 , take Matlab software simulation result as example to further illustrate the present invention.

[0036] The light source of this embodiment adopts a passive mode-locked fiber laser. The central wavelength of the output optical pulse is set to be 1555nm, and the pulse width is 210fs. After inputting the dispersion compensating fiber 2 of 1.3km, the mapping between wavelength and time is formed due to the effect of dispersion, and the output linear chirp Chirped light pulses. Next, two directional couplers 3 and 5 are connected, and the dual parallel modulator 4 is connected to the upper branch of the two directional couplers, and the two lower ports of the directional couplers 3 and 5 are directly connected. The power ratios of the upper and lower branches of the input and output of the dual parallel modulator 4 are both set to 88.9% and 11.1%, and the microwave signal of 5GHz is respectively loaded on the upper and lower MZM modulators accordin...

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Abstract

The invention belongs to the field of optoelectronic technology, and in particular relates to a method and a device for improving the linearity of microwave signal time stretching. The method of the invention utilizes the carrier suppression modulation of the double parallel modulator to realize the suppression of the DC component of the output signal, increases the sensitivity of the detector, effectively eliminates the even-order harmonic distortion, and improves the linearity of the system. By setting the optimal optical power coupling ratio and microwave signal power coupling ratio of the dual parallel modulators, combined with the modulation signal and reference signal interference and balanced detection, the third harmonic and third-order intermodulation distortion can be effectively suppressed, and the system can be significantly improved. The signal-to-noise-distortion ratio and effective number of bits are used to realize the linearization of microwave signal time-stretching analog-to-digital conversion systems.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a method and device for improving the time-stretching linearity of microwave signals. Background technique [0002] An analog-to-digital converter (ADC, Analog-to-digital converter) is an instrument that converts analog signals in nature into digital signals, so it plays a vital role in the process of building a digital system. However, due to the limitation of carrier mobility, traditional electronic analog-to-digital converters are difficult to achieve breakthroughs in broadband, high sampling rate and high effective number of bits. The inherent broadband, high speed, and stability of optical pulses make optical analog-to-digital conversion technology an effective way to break through electronic bottlenecks, making broadband and high-precision analog-to-digital conversion possible. Optical Time Stretch Analog-to-Digital Conversion (TS-ADC) technology is one of the wide...

Claims

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Application Information

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IPC IPC(8): G02F7/00
CPCG02F7/00
Inventor 张旨遥彭迪杨帆马阳雪高源
Owner 成都卓力致远科技有限公司
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