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Microwave signal optical analog-digital conversion method and device based on time stretching

A microwave signal and time-stretching technology, applied in optical analog/digital converters, optics, instruments, etc., can solve the problems of limiting the effective bandwidth and effective sampling rate of the system, so as to increase the effective analog bandwidth and effective sampling rate, reduce the cost, the effect of ensuring consistency

Inactive Publication Date: 2016-04-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

It can be seen that although the differential de-enveloping scheme of the Jalali team solves the technical problem of non-uniformity of the system envelope, it limits the improvement of the effective bandwidth and effective sampling rate of the system at the expense of the stretching factor.

Method used

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  • Microwave signal optical analog-digital conversion method and device based on time stretching
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  • Microwave signal optical analog-digital conversion method and device based on time stretching

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Embodiment

[0042] Take the software simulation of a 4-channel continuous-time optical time stretching system as an example.

[0043] The light source of this embodiment adopts a passive mode-locked fiber laser, whose repetition frequency is 323.7 MHz, the average output optical power is 77 mW, the center wavelength is 1556.18 nm, and the 3 dB bandwidth is 12.16 nm. The optical pulse with an output pulse width of 210fs first passes through the dispersion compensating fiber 2 with a length of 5000m, and introduces linear chirp to realize the mapping of wavelength and time. Then, the optical pulse passes through the continuous optical carrier generation module, which includes two wavelength division multiplexers 4 and 6 with 4 channels and a passband width of 180 GHz, and a polarization-maintaining fiber delay line connecting the two. The delay line length difference between two adjacent channels is set to 0.34ns, 0.64ns, 0.94ns in turn. A time overlap of 0.08ns is formed between adjacent ...

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Abstract

The invention relates to the field of the photoelectric technology, in particular to a microwave signal optical analog-digital conversion method and device based on time stretching. The differential envelope removal technology is adopted for the method, differential processing is conducted on a numeric field according to complementary output characteristics of two output modulators, distortion caused by pulse envelope heterogeneity is eliminated, and the aim of envelope removal is achieved. Two paths of complementary output signals are stretched in two independent time sequences of dispersive media of the same band, and consistency of the stretching multiple is guaranteed while the cost of the dispersive media is reduced. More importantly, limitation of a Jalali differential envelope removal scheme to the maximum stretching multiple is effectively avoided. The effective simulation bandwidth and the effective sampling speed of a continuous time optical analog-digital conversion system is remarkably increased.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a method and device for optical analog-to-digital conversion of microwave signals based on time stretching. Background technique [0002] The digital signal system has many advantages such as flexibility, strong anti-interference ability, easy processing, transformation, encryption and integration. However, most signals in nature exist in the form of analog signals. In order to make full use of the advantages of digital systems, people often use analog The converter (ADC, Analog-to-digital converter) converts the analog signal into a digital signal, and then processes, transmits and stores the signal in the digital system. Therefore, ADC has become the key to constructing a digital system, especially in the backbone network and electronic system, which puts forward high requirements on the accuracy, speed and bandwidth of digital processing. However, due to the physical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F7/00
CPCG02F7/00
Inventor 彭迪张旨遥马阳雪李和平张尚剑张雅丽刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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