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A device and method for calibrating the common mode rejection ratio of a high bandwidth balanced photodetector

A technology of photodetector and common mode rejection ratio, applied in instrumentation, geophysical measurement, etc.

Active Publication Date: 2019-03-19
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] An object of the present invention is to provide a device for calibrating the common-mode rejection ratio of high-bandwidth balanced photodetectors to solve the calibration problem of high-bandwidth balanced photodetector common-mode rejection ratio

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  • A device and method for calibrating the common mode rejection ratio of a high bandwidth balanced photodetector

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Embodiment Construction

[0040] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0041] A common-mode rejection ratio calibration device for high-bandwidth balanced photodetectors, such as figure 1 As shown, including: femtosecond laser 1, beam splitter 2, chopper 3, optical delay line 4, 50 / 50 coupler 5, balanced photodetector 6, microwave probe A7, coplanar waveguide 8, microwave Probe B9, 50Ω load 10, polarization state measurement system 11, lock-in amplifier 12, computer 13;

[0042] Among them, the femtosecond laser 1 is used to output laser light and input it to the beam splitter 2;

[0043] A...

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Abstract

The invention discloses a device used for calibrating the common-mode rejection ratio of a high-bandwidth balancing photoelectric detector. The device includes a femtosecond laser, a beam splitter, achopper, an optical delay line, a 50 / 50 coupler, a balancing photoelectric detector, a microwave probe A, a coplanar waveguide, a microwave probe B, a 50-ohm load, a polarization state measuring system, a phase-locked amplifier and a computer. The invention also discloses a method used for calibrating the common-mode rejection ratio of a high-bandwidth balancing photoelectric detector of the abovementioned device. The invention provides the method for calibrating the common-mode rejection ratio of the high-bandwidth balancing photoelectric detector, and breaks through the limitation of a high-bandwidth balancing photoelectric detector common-mode rejection calibration capability of a traditional light frequency-mixing method and a light modulation method.

Description

technical field [0001] The present invention relates to the field of calibration of balanced photodetectors. More specifically, it relates to an apparatus and method for calibrating the common mode rejection ratio of high bandwidth balanced photodetectors. Background technique [0002] With the development of technologies such as space optical communication and optical radio frequency communication, balanced photodetectors, as devices for receiving coherent light, have received more and more attention. The balanced photodetector can suppress the relative intensity noise and all forms of common mode noise introduced by the local oscillator light in the detected signal, and the receiving sensitivity can be close to the quantum noise limit; at the same time, it can make full use of the power of the local oscillator light, which is different from ordinary photodetectors. It has a larger linear dynamic range than that. The common-mode rejection ratio is the logarithm of the amp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V13/00
CPCG01V13/00
Inventor 姜河龚鹏伟谢文谌贝马红梅杨春涛
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT