Electro-optical sampling method based on polarization rotation effect of semiconductor optical amplifier

Abstract

The present invention provides an electro-optic sampling method based on semiconductor optical amplifier polarization rotation effect. The electro-optic sampling method uses the polarization rotation effect of SOA to obtain the electro-optic characteristic that the output optical power linearly increases along with the input signal current intensity by adjusting the optics working parameter and current working range of an electro-optic sampling system. The linear modulation of signal current on the input sampling optical-pulse intensity is performed by the electro-optic characteristic, therefore the signal current is sampled. The electro-optic sampling method has features of compactness, easy integration, gain, high sampling rate and deep intensity modulation. The electro-optic sampling method provides a powerful prompting effect on real-time unperturbed measurement of the characters of a next-generation optics analog-to-digital converter and an ultra-high speed electronic device withwide application foreground.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, the field of integrated optics and the field of photoelectric signal processing, and in particular relates to an electro-optic sampling method based on the polarization rotation effect of a semiconductor optical amplifier. Background technique [0002] Electro-optic sampling is a photoelectric signal conversion technology, which utilizes the analog signal current to be sampled to modulate the sampled optical pulse signal through a certain electro-optical medium, and obtains the output of the optical pulse signal whose intensity is linearly modulated, realizing the real-time acquisition and processing of analog electrical information. Measurement. like figure 1 As shown, the optical input terminal 1 of the electro-optic sampling system inputs a sampling optical pulse with a high repetition rate and equal amplitude, and at the same time inputs the analog signal current to be sampled at the...

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Problems solved by technology

Electro-optic crystal LiNbO was used in early electro-optic sampling systems 3 and LiTaO 3 etc., although they have good temperature characteristics, but the large dielectric constant means that the absorption of sampled light is large, and there is a high loss

Although GaAs and ZnTe crystals adopted later have smaller dielectric constants and higher frequency response stability, these electro-optic sampling methods using electro-optic crystals are not conducive to integration and do not conform to the development direction of optical device integration.

The half-wave voltage of the traditional electro-optic crystal is on the order of KV. For the electrical signal to be tested, which is usually below 1V, it can only achieve an intensity modulation depth of about 0.1%, and the output optical signal intensity is small (see literature Wang Lu, Liu Qinggang, Li Suoyin, etc. High-speed electro-optic sampling technology and its application [J]. Micro-Nano Electronics Technology, 2006, 43(4): 197-202.), which is also not conducive to the subsequent processing of optical signals

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