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Optical power detection apparatus and method

A technology of optical power detection and power, which is applied in the field of optical communication, can solve problems such as the inability to make good use of digital amplifiers, narrow detection range, and low voltage resolution, so as to facilitate debugging and fault location, improve sampling accuracy, and ensure reliability Effect

Inactive Publication Date: 2008-11-05
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its uniform resolution, the current ADC generally only has an input detection range of 2.5V, so the voltage resolution per dB is too low, which affects the detection accuracy of optical power, resulting in some Applications requiring precision detection cannot make good use of the advantages of logarithmic amplifiers
[0005] From the above introduction, it can be seen that there are defects in the currently commonly used optical power detection devices: unbalanced detection resolution, such as linear amplifiers with different detection resolutions for both ends of the range; too narrow detection range; insufficient detection accuracy, etc.

Method used

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  • Optical power detection apparatus and method

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Embodiment 1

[0039] A high-precision optical power detection device, as shown in Figure 1, includes a photoelectric conversion unit (10), a logarithmic amplification unit (20), a subtraction unit (30) and a secondary amplification unit (40) connected in sequence, wherein The subtraction unit (30) is also connected to the control unit (60), the secondary amplification unit (40) is connected to the AD (analog-to-digital) conversion unit (50), and the control unit (60) is connected to the AD conversion unit (50). The following is a detailed introduction to the functions of each unit.

[0040] A photoelectric conversion unit (10), used for photoelectric conversion, can use an APD or PIN conversion circuit;

[0041] A logarithmic amplification unit (20), configured to logarithmically amplify the voltage output result of the photoelectric conversion;

[0042] The subtraction operation unit (30) performs subtraction operation on the voltage output result of the logarithmic amplification unit (20...

Embodiment 2

[0063] The optical power detection device provided by this embodiment is shown in Figure 3, and the device includes a photoelectric conversion unit (10), a logarithmic amplification unit (20), a secondary amplification unit (40), and an AD conversion unit (50) connected in sequence. ), a control unit (80) and a subtraction unit (70), wherein the photoelectric conversion unit (10) is also connected to the subtraction unit (70). The following is a detailed introduction to the functions of each unit.

[0064] A photoelectric conversion unit (10), used for photoelectric conversion, can use an APD or PIN conversion circuit;

[0065] A logarithmic amplification unit (20), configured to logarithmically amplify the shunted circuit voltage;

[0066] The subtraction unit (70) can be realized by using a controllable current source, and part of the current is shunted from the PD circuit, and this part of the current can be converted into a voltage value correspondingly. In this embodimen...

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Abstract

The invention discloses an optical power detecting device and method, pertaining to the optical communication field. The method of the invention includes: after the photoelectric conversion of the light to be measured, executing subtraction arithmetic to the output voltage magnitude of the light to be measured and the known voltage magnitude, to obtain a difference value; amplifying the difference value, and combining the known voltage magnitude to calculate for obtaining the optical power of the light to be measured. The technical scheme of the invention greatly improves the sampling accuracy, simultaneously has relative simple circuit structure, which is convenient for debugging and fault locating; in addition, the technical scheme of the invention remarkably improves the power testing accuracy and ensures the optical power testing reliability.

Description

technical field [0001] The invention belongs to the field of optical communication, in particular to an optical power detection device and method. Background technique [0002] In the field of optical communication, since the index of optical power is a very important index, the detection of optical power occupies an indispensable and important position in the entire transmission system. At present, the main method used is to use a coupler to separate part of the monitored light to an APD (avalanche photon detector, avalanche photodiode) or PIN tube to realize photoelectric conversion. The amplified voltage is sampled to finally calculate the light to be detected. power value. In the voltage amplification process, the most commonly used amplifiers include linear amplifiers and logarithmic amplifiers. Of course, there are also some integrated optical power detection devices, but due to their versatility and price, they are far less than the above two amplifiers. common. ...

Claims

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Application Information

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IPC IPC(8): H04B10/08H04B10/07
Inventor 邹红兵
Owner ZTE CORP
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