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Phase modulation -type analog to digital converter

A phase modulator and phase modulation technology, applied in optical analog/digital converters, optics, instruments, etc., can solve the problems of multiple photodetectors and comparators, low coding efficiency, etc.

Inactive Publication Date: 2010-09-01
TSINGHUA UNIV
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Problems solved by technology

However, the coding efficiency is much lower than that of the first one. The N-way can only achieve log2(2N) quantization bits theoretically.
[0008] and requires more photodetectors and comparators

Method used

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  • Phase modulation -type analog to digital converter
  • Phase modulation -type analog to digital converter
  • Phase modulation -type analog to digital converter

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Embodiment Construction

[0036] refer to image 3 System block diagram, the sampling optical pulse passes through a polarization controller, and the two orthogonal polarization states of the pulse in the fiber are adjusted to be parallel to the x and y axes of the lithium niobate crystal in the phase modulator, so that the phase modulator only adjusts one of the optical polarization states The phase difference of the two polarization states of light is linearly modulated by the voltage intensity of the analog signal loaded on the phase modulator, that is, the optical pulse samples the analog signal, and the analog signal voltage information is transferred to the two polarizations of the optical pulse on the phase difference of the state. Then the optical pulse is divided into N channels through the polarization-maintaining beam splitter, and each channel passes through the optical phase shifter array, so that the phase difference between the two polarization states of the optical pulse of each channel...

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Abstract

A phase modulation type optical analog-to-digital converter pertains to the field of high-frequency analog signal processing, and is characterized in that a phase modulator, a polarization maintaining beam splitter and an optical phase shifter array are cascaded, the polarization maintaining beam splitter is used for dividing the output of the phase modulator into N paths, each path further utilizes the optical phase shifter to attach one arithmetic increasing phase difference on two polarization states, then the interference is generated by a polarization detector, and the sequential translation of transmission curves of N paths is realized, after that, the interference light intensity is converted to electric signals of N paths by an electro-optical detector array, and finally the quantization coding of one-time sampling result of analog signals is realized by using a comparator array. The invention has the advantages of integratability, good stability, strong real-time property andhigh bandwidth up to dozens of gigahertz.

Description

technical field [0001] It belongs to the field of electronic information, microwave photonics, and high-frequency analog signal processing. technical background [0002] Analog-to-digital converter (Analog-to-digital converter, ADC) is to sample and quantize and encode the analog signal; to convert the analog signal into a digital signal for subsequent transmission or digital processing. Because digital signals have obvious advantages over analog signals in terms of transmission, anti-interference, confidentiality and processing speed. Therefore, the digital system and the digital signal processing technology are developed at a high speed. As a key device for converting various analog signals in nature or man-made into digital signals, the research and development of analog / digital converters is extremely important. [0003] With the development of technology, the bandwidth of analog signals to be digitized has gradually increased, and the coverage has increased from gigah...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F7/00
Inventor 李王哲张洪明姚敏玉
Owner TSINGHUA UNIV
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