Scoustoelectric light modulator of optical fiber for body wave

An electro-optic modulator and optical fiber acoustic technology, which is applied in optical fiber transmission, optics, instruments, etc., can solve problems such as inability to use optical fiber communication modulation, inability to control the center frequency of devices, etc.

Inactive Publication Date: 2004-10-27
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, these two modulators have their own defects. The bulk-wave fiber-optic acousto-optic modulator cannot control the center frequency of the device because it has no DC electrodes. The bulk-wave acousto-electro-optic modulator cannot be used for modulation of optical fiber communication because it has no optical fiber. in technology

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  • Scoustoelectric light modulator of optical fiber for body wave
  • Scoustoelectric light modulator of optical fiber for body wave
  • Scoustoelectric light modulator of optical fiber for body wave

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Embodiment Construction

[0017] according to figure 1 structure and Figure 8 The process flow chart, the main production process is introduced as follows 1. Optical processing

[0018] The directional cutting and grinding and polishing of crystals are collectively referred to as optical cold processing. The orientation error of each crystal plane cannot exceed 5', and the smoothness reaches 11 grades. Five of the six crystal faces of the acousto-electro-optic crystal need to be polished, and the parallelism error between the light incident surface and the light exit surface and between the two crystal surfaces of the electroplated photoelectrode cannot exceed 3'. The crystal surface of the pasted transducer has the highest requirements. In addition to the above requirements, its flatness must be less than 1 aperture. The crystal surface opposite to the transducer does not need to be polished, and it must be ground to a certain angle. The purpose is to make the propagation direction of the ultrason...

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Abstract

This invention characterizes an electroacoustic transducer is bonded at top surface of a light electroacoustic crystal to the coated with electroacoustic electrode on front / back surface, a short focusing lens is sticked to its right / left surface and input and output fibers are sticked to outside of the lens surface. Operation procedure is to apply RE signal with being transmitted audio or video signals onto an electroacoustic transducer processed with piezoelectric crystal chips to generate supersonic wave to enter into the crystal. Laser from input fiber focuses in the crystal via lens to generate refractive light to the transducer to be modulated, then to change the central frequency of modulator by altering DC voltage and direction applied on the photoelectric electrode to suit the RF modulated signals.

Description

technical field [0001] The bulk wave fiber optic acousto-electro-optic modulator k can be used in fiber optic communication modulation technology, and belongs to the fields of fiber optic communication and fiber optic sensing. technical background [0002] At present, there is a kind of "bulk wave optical fiber acousto-optic modulator", which has been reported abroad. For example, S.S.Tarng of Riton Applied Technology Company in the United States reported a fiber optic acousto-optic device that uses an acousto-optic modulator bonded between the input and output fibers to realize the modulation of the transmitted light in the fiber (SPIE, 1987: 753 , P.150-154). The other type is "bulk wave acousto-electro-optic modulator", which has also been reported at home and abroad. For example, Demetri Psaltis and others from California Institute of Technology published the paper "Acousto-Electro-Optic-Optic Modulation" (Applied Physics Letter, V.46, N.3, P.215-217, 1985), and Hyuk L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01H04B10/25
Inventor 俞宽新
Owner BEIJING UNIV OF TECH
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