Electro-optic intensity modulator with improved switch extinction ratio and its application

Abstract

An electro-optical intensity modulator and its application to realize the improvement of the switch extinction ratio, the electro-optic intensity modulator includes an input optical waveguide; a first coupler; a first pair of phase modulation arms, and the sides of the two arms are provided with a first pair of rows Wave electrode; multi-mode interference structure, which includes two input optical waveguides, a multi-mode interference region and two output optical waveguides, used to convert the two beams of light modulated by the first pair of phase modulation arms through the multi-mode interference region The new two beams of light that are output; the second pair of phase modulation arms, the sides of the two arms are provided with a second pair of traveling wave electrodes; the second coupler and the output optical waveguide, which are used to combine the second coupler after the light output. The structure of the present invention can compensate the decrease of the extinction ratio caused by the asymmetry caused by the process error by tuning the optical power ratio of the two branches at the input end of the modulator, significantly improve the extinction ratio, increase the process tolerance, and improve the production efficiency and good quality Rate.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and more specifically relates to an electro-optic intensity modulator for improving the switch extinction ratio and its application. Background technique [0002] In practical applications, modulators are widely used in systems such as optical transmitters, optical information processing, optical fiber communications, and optical interconnection to regulate the intensity, phase, and polarization state of optical carriers, and are used as core devices in optical communication and optical interconnection systems. One, the modulator realizes the conversion of electrical signals to optical signals, and its performance directly determines the performance of the entire communication system. The switch extinction ratio is one of the important indicators to measure the performance of the modulator. The extinction ratio has an impact on the transmission performance of information. Small The exti...

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Problems solved by technology

[0002] In practical applications, modulators are widely used in systems such as optical transmitters, optical information processing, optical fiber communications, and optical interconnection to regulate the intensity, phase, and polarization state of optical carriers, and are used as core devices in optical communication and optical interconnection systems. One, the modulator realizes the conversion of electrical signals to optical signals, and its performance directly determines the performance of the entire communication system. The switch extinction ratio is one of the important indicators to measure the performance of the modulator. The extinction ratio has an impact on the transmission performance of information. Small The extinction ratio will affect the judgment of the communication receiving module, reduce the sensitivity of the receiving module, and affect the transmission of module information. A large extinction ratio will improve the receiving sensitivity of the module, but not the bigger the better. The extinction ratio of the German type) is affected by the symmetry of the two branch waveguides of the modulator. The higher the symmetry, the greater the extinction ratio. However, considering the design and processing errors, the actual asymmetry of the two arms will greatly reduce the modulator. The switch extinction ratio of

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