Optoelectronic transmitter

FIELD: physics.

SUBSTANCE: optoelectronic transmitter consists of a power source, a laser, a turned semitransparent reflecting mirror, a correcting lens, an electrical modulator, a small-size photodetector and an automatic switch. The optical output of the laser is connected through the turned semitransparent reflecting mirror to the optical input of the correcting lens. The optical output of the correcting lens is connected to the optical input of the small-size photodetector, having an output which is connected through the electrical modulator to the first input of the automatic switch. The automatic switch has a second input and an output, respectively connected to the output of the power source and the input of the laser.

EFFECT: reduced size and power consumption of the device.

1 dwg

 

The invention relates to the field of optoelectronics and can be used in optical systems.

Known optoelectronic transmitter described in the book by I. K. Vereshchagin. "Introduction to optical electronics". M., High school, 1991, p. 62. It consists of a radiation source in the form of a laser, which may be formed in semiconductor performance. Furthermore, the spectrum of the laser radiation can be converted into another range. However, the device has increased the complexity and dimensions.

Known optoelectronic transmitter described in patent No. 2270498 from 19.07.2004, published in BI No. 5 dated 20.02.2005 G., author Chasovskikh A. A. it uses a laser, corrective lens and rotated reflective mirror, which can be translucent, providing a reflection of half of the light energy in the space. The other half of the light energy passes through the mirror and arrives at the optical input of corrective lenses. Pumping inside the laser can be carried out by the supply voltage from the power supply nodes in laser performing pumped. After passing the beam from the laser through a corrective lens is a conversion of the radiation spectrum to another spectrum, providing an increase in the radiation power of the laser. The apparatus may include an electric modulator issuing the command to �mpulse or continuous wave laser. However, the size of the device do not always satisfy these requirements. In the proposed device reduces its size without reducing the radiation power.

This is achieved by the introduction of small-sized sensor and automatic switch, with optical corrective lenses is associated with small-sized optical input of the photodetector having an output connected through an electrical modulator to a first input of an automatic switch having a second input and output, respectively connected to the output of the power source and to the input of the laser.

In the figure 1 and in the text the following notation

1 - small-sized photodetector

2 - corrective lens

3 - turned semi-transparent reflective mirror

4 laser

5 - automatic switch

6 - power source

7 - electric modulator

the optical output of the laser 4 is connected through turned translucent reflective mirror 3, through a corrective lens 2 with a small-sized optical input of the photodetector 1 having an output connected through an electrical modulator 7 to a first input auto switch 5, the second input and the output of which is respectively connected with the output of the power source 6 and the input of the laser 4.

The device operates as follows.

Source�IR 6 to provide constant voltage at reduced power through the automatic switch 5 to the input of the laser 4 to perform its pumping. Wherein the switch connects the power source to the laser in the absence of voltage at the other input of the switch. As a result, the laser produces a luminous flux which passes through the rotated semi-transparent reflective mirror 3, and part of the energy enters the space, reflected from the mirror 3, and the correcting lens 2, which provides the conjugation of this beam with small sensitive elements of the photodetector 1, where the conversion of light energy into an electrical signal. The size of the photodetector can be several millimeters, and its specific implementation is presented in the book of A. M. Vasilevsky et al. "Optical electronics". Energoatomizdat, 1990, p. 32. Further, the voltage whose magnitude depends on the power of the radiation received into an electrical modulator, forming continuous or quasiseparable signal following through the above automatic switch 5 to the input of the laser. In this case, the switch 5 when the signal from the modulator 7 from the laser disables the power source 6 and connects the modulator 7 to the laser.

An example of execution of the automatic switch are presented in the book by A. S. Traube, V. G. Mirgorod. "The basics of electronics and automatics". M., Higher school, 1985, pp. 142, 143. Depending on the signal coming from the modulator 7, the laser 4 radiation�t continuous or pulsed light energy. In this case, the radiation power increases, the pulse frequency may be, for example, 100 Hz. Further, the above-mentioned process is repeated many times, and is provided by avalanche-like increase of the voltage output of the photodetector and the radiation power of the laser. The reason is that as you increase the voltage to the pump increases the energy of the pump, and hence the magnitude of its income on a laser active medium 4.

As laser can be used, for example, a compact diode laser, presented in the book of Y. Eichler. "The world of physics and technology", "Lasers, execution, management and applications". Technosphere, Moscow, 2012, pp. 193-196. In this device, the radiation is homogeneous and provides positive feedback to the conversion of optical energy into electrical energy. The output of light energy by reflecting it turned from a translucent reflective mirror 3.

Using the proposed device is provided with sufficient radiation power with reduced energy consumption, providing greater energy efficiency.

The device can be used in systems requiring compact performance. Possible that instead turned translucent reflective mirror is used electrooptical OTK�nausea device. However, with growing dimensions. The proposed device can be used in radio systems.

Optoelectronic transmitter comprising a power source, laser, turned semi-transparent reflective mirror, corrective lenses and electric modulator, where the optical output of the laser is connected through turned translucent reflective mirror with optical input corrective lenses, characterized in that the introduced small-sized detector and automatic switch, with optical corrective lenses is associated with small-sized optical input of the photodetector having an output connected through an electrical modulator to a first input of an automatic switch having a second input and output, respectively connected to the output of the power source and to the input of the laser.



 

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