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Optical analog-to-digital converter based on polarization modulation

A digital converter and polarization modulation technology, which is applied in the field of photoelectric signal processing and optical analog-to-digital converter, can solve the problems of analog-to-digital conversion method, sampling rate reduction and transit time increase without polarization modulation

Inactive Publication Date: 2010-01-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • Optical analog-to-digital converter based on polarization modulation
  • Optical analog-to-digital converter based on polarization modulation
  • Optical analog-to-digital converter based on polarization modulation

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing, further illustrate the present invention with 4 encoders. Such as figure 1 As shown, suppose that the output wavelength of the semiconductor mode-locked laser is λ=1.55μm, the pulse width is 0.2ps (full width at half maximum), the peak power is 0.1mW, and the repetition frequency is 10GHz. In the mode fiber, the polarized light polarizer 2 becomes linearly polarized light, and is evenly split into 4 paths, which are respectively input into the Ge-YIG fiber with magneto-optic effect, and the fiber length is 6mm (the magnetic field effect of the magnetic induction coil The length is also 6mm), and the Wedel coefficient is 1100 0 / (cm T), the propagation time of the pulsed light in it is only T 0 =0.05ns, so the propagation time is less than the pulse period interval T=(10GHz) -1 =0.1ns, which satisfies the sampling requirements of the modulated signal, that is, during the modulation process, the polarization state of only...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F7/00
Inventor 唐雄贵李和平廖进昆陆荣国罗文刘永智刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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