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Calibration device and method of optical transmitter modulation measurement equipment

A technology of optical transmitter and measuring equipment, which is applied in the direction of transmission monitoring/testing/fault measurement system, etc. It can solve the problems of modulation degree drop, continuous fire, shortened communication distance, etc., and achieve the effect of improving reliability

Inactive Publication Date: 2015-03-11
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the ultraviolet light source used in the ultraviolet communication system is mainly a vacuum gas discharge lamp. This type of light source uses the ions ionized by the gas in the vacuum to conduct electricity, and it is not easy to perform high-speed modulation. With the increase of the modulation frequency (communication rate), there will be The "continuous fire" phenomenon, when the total radiation power of the light source remains unchanged, its modulation degree is greatly reduced, resulting in shortened communication distance, so the modulation degree of the light source directly reflects the overall power and efficiency of the communication system

Method used

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  • Calibration device and method of optical transmitter modulation measurement equipment

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Embodiment 1

[0031] Such as image 3 As shown, a calibration device for optical transmitter modulation degree measurement equipment consists of six parts: laser transmitter, signal modulation unit, collimator beam expander unit, equipment to be calibrated, data acquisition card and host computer. The laser transmitter composed of a laser and an adjustable attenuator emits a laser signal with adjustable output power; the driving circuit and the acousto-optic modulator jointly complete the simulation of different modulation degrees of the optical transmitter and the simulation of a certain frequency and amplitude signal (acousto-optic modulation The zero-order diffracted light generated by the laser has a DC component, and by adjusting the incident angle of the laser incident on the acousto-optic modulator, the DC component in the zero-order diffracted light can be changed to realize the simulation of different modulation signals); since the laser spot is small, the direct The repeatability ...

Embodiment 2

[0034] Such as Figure 4 As shown, a calibration device for optical transmitter modulation degree measurement equipment is composed of an optical transmitter composed of an LED array and a temperature control system, a signal modulation unit, a device to be calibrated, a data acquisition card and a host computer. In this embodiment, an adjustable LED light transmitter is used to replace the laser transmitter in the first embodiment. In order to obtain an optical signal with stable power, it is necessary to add a temperature control system to the LED. The signal modulation unit outputs signals of different bias voltages, frequencies and amplitudes to drive the LEDs, and then an analog light emission with a certain frequency and amplitude modulation can be obtained. machine signal. In addition, due to the large divergence angle of the LED, the collimating beam expander system in the first embodiment is not needed, which simplifies the structure of the device.

Embodiment 3

[0036] A method for calibrating an optical transmitter modulation degree measuring device, comprising the following steps:

[0037] S1, start step: the optical transmitter sends out an optical signal, and adjusts the power of the transmitter;

[0038] S2, signal modulation step: according to the working frequency of the equipment to be calibrated, use the signal modulation unit to modulate the input optical signal to make it output a square wave form with a certain frequency and amplitude, and adjust the AC and DC components of the signal to make the output optical signal Has a certain degree of modulation;

[0039] S3, waveform acquisition step: the optical signal is transmitted to the modulation degree measurement equipment to be calibrated in the form of spatial light, and after photoelectric conversion, it is output to the waveform acquisition unit in the form of a voltage signal, and the waveform acquisition unit samples the waveform and transmits it to the data processing ...

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Abstract

The invention discloses a calibration device of optical transmitter modulation measurement equipment. The calibration device comprises the following five parts: an optical transmitter, a signal modulation unit, to-be-calibrated equipment, a waveform acquisition unit and a data processing unit, wherein the optical transmitter emits an optical signal, the optical signal is firstly modulated as a square signal through the signal modulation unit, and then transmitted to a waveform acquisition unit to be sampled through the photovoltaic conversion of the to-be-calibrated equipment, and finally processed by the data processing unit to calculate the modulation degree. Furthermore, the invention further discloses a calibration method of the optical transmitter modulation measurement equipment. The function of calibrating the optical transmitter modulation measurement equipment is implemented through six steps: beginning, signal modulating, waveform acquiring, modulation degree calculating, judging and calibrating. The calibration device and the method disclosed by the invention can be used for calibrating the optical transmitter modulation measurement equipment in different work wavebands and frequencies, and accurately determining the capacity of suchlike equipment in detecting optical communication complete machine power and efficiency; the performance of the suchlike equipment is perfected, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of calibration of modulation degree measurement equipment for wireless optical communication transmitters, in particular to a calibration device and method for the modulation degree measurement equipment of ultraviolet light communication transmitters. Background technique [0002] With the development of ultraviolet light communication technology, the ultraviolet light communication system is gradually becoming mature. However, the communication systems and equipment developed by various research units have different performances, and the lack of unified standards and specifications makes the industrialization of ultraviolet light communication systems very difficult. Therefore, it is of great significance for the development of this field to calibrate the equipment and measurement equipment of the ultraviolet light communication system uniformly. [0003] At present, the ultraviolet light source used in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/07
Inventor 唐义南一冰黄河清王少水孙权社张学彬
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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