Wideband linearization photonic time-stretch analog-to-digital conversion (PTS-ADC) method and device

Abstract

The invention belongs to the photoelectric technology field and relates to a wideband linearization photonic time-stretch analog-to-digital conversion (PTS-ADC) method and device. The method has the beneficial effects that single-sideband modulation is achieved by utilizing dual-drive M-Z modulators, thus eliminating baseband signal power attenuation caused by dispersion and achieving improvement of the effective analog bandwidth; distortion caused by dispersion introduction phase shifting is eliminated and timing recovery of zero phase shifting distorted signals is achieved by the phase compensation technology; radio-over-fiber signals with complementary characteristics are obtained by adopting two M-Z modulators respectively biased at linear bias points of a falling edge and a rising edge; envelope removal of the radio-over-fiber signals and suppression of second harmonics and second-order and third-order intermodulation distortion are achieved through difference and arcsine algorithm processing in a digital signal processor, thus achieving the effect of obviously improving the system linearity and quantization precision; besides, synchronous stretch of complementary output signals of the two modulators is achieved by utilizing two circulators, thus reducing the system cost and ensuring the consistency of the stretching ratios.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a broadband linearized optical time-stretching analog-to-digital conversion method and device. Background technique [0002] In order to overcome the electronic bottleneck of the traditional electronic analog-to-digital converter (ADC, Analog-to-digital converter) and achieve higher bandwidth, speed and precision, various optical analog-to-digital conversion technologies have been proposed successively. Among them, optical time-stretching analog-to-digital conversion (PTS-ADC, Photonic time-stretch ADC) is an optically assisted analog-to-digital conversion technology, which synchronizes optical pulses and high-speed microwave signals modulated on optical pulses through optical dispersion effects Stretch to realize the down-frequency of the microwave signal, and then use the low-speed, high-precision ADC that can process the down-frequency signal for sampling and quantizat...

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Problems solved by technology

However, in the above two schemes, the former assumes that the modulation process is a linear process, while the latter assumes that the pulse envelope is known, so both methods cannot achieve linearization and de-envelope processing while solving the power loss

Therefore, so far, there is still no feasible solution that can remove the adverse effects of the envelope, overcome the power loss caused by dispersion, and achieve the linearization of the system

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