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Optical modulator

A technology of optical modulator and device layer, which is applied in the field of signal communication, can solve the problems of inability to realize long-distance point-to-point communication, strong absorption, etc., and achieve the effect of low power consumption and good confidentiality

Inactive Publication Date: 2012-11-28
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

However, the multi-quantum well spatial light modulator used in general post-modulation free-space optical communication systems works in infrared bands such as 850nm, 980nm and 1550nm, and is strongly absorbed in the atmosphere, especially underwater, and cannot achieve long-distance point-to-point communication.

Method used

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Embodiment Construction

[0023] An embodiment of the present invention discloses an optical modulator, which includes a quantum well active layer, and the quantum well active layer is made of InGaN / GaN material.

[0024] GaN-based multiple quantum well materials are completed using molecular beam epitaxy (MBE) or metal organic chemical vapor deposition (MOCVD). The material is a p-i-n structure. The quantum well active layer is composed of multi-period undoped InGaN / GaN, and the number of periods is about 5-20. By adjusting the composition of In, the adjustment of the working wavelength can be achieved. The working wavelength is 430-530nm. In order to achieve multiple reflections and improve the contrast ratio of the modulator, a Bragg reflector (DBR) layer structure is added at both ends of the multiple quantum well to form an F-P cavity. The Bragg reflector layer consists of multi-period, n, p-doped GaN / AlGaN, respectively, or can also consist of a single-layer GaN / air interface. The lower Bragg...

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Abstract

The invention discloses an optical modulator, comprising a quantum well active layer which is made from InGaN / GaN material. Through the technology, the optical modulator disclosed by the invention can solve a problem that an infrared band is strongly absorbed under the atmosphere and water, and realizes free-space optical communication of red and green visible lights. The communication has the characteristics of good confidentiality, low power consumption and multi-point distribution and can be applied to identification friend or foe, unmanned planes, detection of oceanographic buoys, mineral prospecting and search and rescue and the like.

Description

technical field [0001] The invention belongs to the field of signal communication, and in particular relates to a GaN-based blue-green light multi-quantum well spatial light modulator, which can be applied in the fields of identification of friend or foe, unmanned aerial vehicle, marine buoy detection, prospecting, search and rescue and the like. Background technique [0002] Most of the current wireless communication systems are based on broadcast principles. [0003] Satellite communication is the most important means of communication at present. In this communication method, the base station emits electromagnetic waves, which are relayed by the relay station or satellite, and then received by the terminal equipment. The disadvantage of this communication method is that, first of all, it needs the cooperation of a base station or a satellite system, and the system is complicated. Secondly, this is a broadcast system, and the signal propagates non-directionally in free sp...

Claims

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Application Information

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IPC IPC(8): G02F1/017H04B10/04H04B10/10
Inventor 黄寓洋殷志珍冯成义李文张耀辉
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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