A device and method for measuring half-wave voltage of an electro-optic phase modulator

An electro-optical phase modulation, half-wave voltage technology, applied in the field of optoelectronics, to achieve stable beat frequency, avoid complex conversion process, and solve the effect of inability to directly detect

Active Publication Date: 2016-04-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of technology, the measurement method of the half-wave voltage of the electro-optic phase modulator has been greatly developed and improved, but the measurement method of the half-wave voltage of the electro-optic phase modulator with high precision and high resolution still needs further research and improvement

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  • A device and method for measuring half-wave voltage of an electro-optic phase modulator
  • A device and method for measuring half-wave voltage of an electro-optic phase modulator
  • A device and method for measuring half-wave voltage of an electro-optic phase modulator

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Embodiment

[0060] Adjust the optical carrier frequency ω output by the tunable laser 1 0 =193.1THz, the frequency ω of the frequency shift of the acousto-optic frequency shifter 6 f =70MHz, set the modulation frequency ω of the microwave signal source 5 m =500MHz, observe the center carrier of the tunable laser 1 and its k (k=±1,±2,±3,…) order modulation sidebands and the output frequency of the acousto-optic frequency shifter 6 is 193.1THz±70MHz frequency-shifted light The beat frequency signal of the carrier, the frequency of the beat frequency signal is 70MHz, k×500MHz±70MHz.

[0061] figure 2 In this embodiment, the modulation frequency ω obtained by using the method of measuring the half-wave voltage of the electro-optical phase modulator according to the present invention is m =500MHz, a set of amplitude values ​​of frequencies 70MHz, 500MHz-70MHz, 500MHz+70MHz, 2×500MHz-70MHz, and 2×500MHz+70MHz measured on the spectrum analyzer 9.

[0062] Let k=1, the frequency in the recor...

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Abstract

The invention discloses a device and method for measuring the half-wave voltage of an electro-optic phase modulator, which comprises a tunable laser connected in sequence, a first optical coupler, a polarization controller, an electro-optic phase modulator to be tested, a second optical coupler, Photodetectors, spectrum analyzers, microwave signal sources and acousto-optic frequency shifters are also included. The present invention adopts the tunable laser to output the optical carrier and divides it into two beams through the first optical coupler, which are respectively processed by the acousto-optic frequency shifter and the electro-optic phase modulator to be tested, and then combined by the second optical coupler to realize stable beat frequency , and the half-wave voltage of the electro-optic phase modulator is obtained by comparing the amplitude of the carrier beat frequency and the sideband beat frequency, which has the advantages of high resolution, high precision, good accuracy, simple structure and convenient operation.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the field of optical fiber communication technology and photoelectric signal processing technology, in particular to a device and method for measuring the half-wave voltage of an electro-optic phase modulator. Background technique [0002] With the development of digital optical communication, the electro-optic modulator plays an important role in the theoretical research and practical application of signal processing in optical communication. The electro-optical phase modulator is one of the basic devices in optical transmission and optical signal processing systems. With the development of optical fiber communication systems becoming more and more mature, it is more and more important to accurately measure the characteristic parameters of the electro-optic phase modulator at each modulation frequency. , the half-wave voltage is one of the characteristic parameters of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 张尚剑王恒邹新海尹欢欢刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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