Optical analog-to-digital converter based on polarization modulation

Abstract

The invention provides an optical analog-to-digital converter based on polarization modulation, belonging to the field of photoelectric technology, and relates to a photoelectric signal processing and optical analog-to-digital converter. N-path current modulation signals uniformly divided by a sampling analog current signal are respectively input to a magnetic induction coil by an amplifying circuit; pulsed light emitted by a laser is polarized into a linearly polarized light by a polarizer, and the linearly polarized light is divided into N light path signals by a beam splitter, and the N light path signals are respectively input to N photoelectric branch circuits; the optical signal of each photoelectric branch circuit firstly passes through magneto optic effect material in the magnetic induction coil, and then is analyzed by an analyzer into an optical signal which is converted into an electrical signal by a photoelectric detector, the electrical signal is amplified by an amplifier and is input to the corresponding comparer to carry out threshold value judgment, and a digital signal is finally output by the comparer. The converter can realize the output of the digital signal with the traditional binary code and Gray code, and has the advantages of rapid sampling speed, more effective number bits, no restriction of the binary code and the Gray code, simple structure and low cost.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology and relates to optoelectronic signal processing technology, in particular to an optical analog-to-digital converter for modulating the polarization state of light waves based on the magneto-optic effect to realize signal analog-to-digital conversion. Background technique [0002] From computers, communications, sensing to information storage and display, from electricity, magnetism to sound, light and even life sciences, almost all technical fields are closely related to digital technology. It has a very close influence on scientific research, and it has become one of the main symbols of a country's comprehensive national strength. Usually, the signals in nature exist in continuous form (that is, analog signals). In order to facilitate the storage, processing and transmission of signals, analog signals must be converted into digital signals. The core device is an analog-to-digital converte...

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Problems solved by technology

But the disadvantage is that the length of the modulation electrode increases exponentially with the increase of the number of bits, so that its transit time increases sharply, which leads to a decrease in its sampling rate. The effective number of bits and the sampling rate are mutually restrictive, which is the key factor affecting the performance of the ADC.

So far, there has been no report on the analog-to-digital conversion method based on polarization modulation

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