| Optical communications is becoming more and more rapidly its security andstability is getting better and better, IT industry has become an important direction ofdevelopment, many colleges and universities of the electronics, communicationsprofessionals are set up with the optical communication-related courses. Opticalcommunication and wireless access is the newly developed method is opticalcommunication and wireless communications combined with the product, opticalwireless communication technology works with laser devices and the growingmaturity of the development and utiliza ses highly concentrated beam of lightto penetrate the atmosphere of the space as an information transmission medium,rather than through fiber-optic signal transmission. Wireless optical communicationwith the frequency bandwidth, high speed, and the spectrum is rich in resources, theapplication of any communication protocol, to set up flexible and convenient, saferand more reliable, low consumption, low-cost advantages of such features. Therefore,the adoption of optical communications and wireless optical communicationtechnology, this article has designed a short-range wireless optical communicationfunction of the audio signal transmission circuitry.Chose short-range, that is, in order to avoid the process of signal transmissionover by external environmental factors, such as poor weather conditions, will have aspread of signal attenuation, scattering particles in the air, will light in space, time andbias point of view, the atmosphere of the particles will absorb laser energy, theattenuation of the signal transmitting power. Transmission distance and signal qualityis very conspicuous contradictions, the greater the transmission distance, the morewide-beam, the optical signal receiver, such as the quality of some of the problemsworse, so that signal transmission to the requirements of the media will be more and more suitable for indoor applications .Short-range wireless optical co means of its transmission is the application of light transmission, with the current transmission of radio waves as csmallest, can fully elimi tion of physical anxiety emphasis on environmtime is also a considerable amount of information, wireless optical communication to lay lines, but also the need for special tools and equipment to connect, and the bend In this paper, circuit design, the use of professional circuit design software ge number of new fto deal with high-density packaging technology, such as the number of high-density and modify the operation of convenience. In this circuit simulation using the simulation software Multisim. Multisim is a mmunicationompared to radiation on the human body can be said to reduce the level of the nate the communication signal radiaental protection and health of the people, will be pro-Lai wireless optical communication transmission. Optical signal of the speed of dissemination of information is not compared to other signals, the unit transmission compared to other access equipment is one of the biggest advantages of bandwidth, high efficiency in the pursuit of short-term contemporary society, the way that optical transmission is even more shows of its unparalleled advantages. Although the speed of fiber-optic communications is very fast, but its cost is a big need for pre-designed radius of optical fiber and cable can not be too small, once the equipment or replacement of the location of mobile, before the laying of the line will not be able to better use. And wireless optical communication is a very good solution to the above problems. Altium Designer, Altium Designer greatly enhanced support for high density board design can be used to design high-speed digital signals to provide a lareatures and improvements, improved multi-storey complex board of management and navigation, the device can be placed on both sides of the PCB board pin ball grid array (BGAs). Before these advanced PCB design technology has been limited to advanced PCB design products. It is precisely because the power of Altium Designer to move the circuit design of this article has a good platform to ensure that the schematic diagram and the stability of PCB design, ensuring the PCB schematic Canadian technology company image interactive (Interactive Image Technoligics company referred to as IIT) to launch Windows-based simulation tool for board-level analog / digital circuit board design. It contains a graphical schematic circuit input, the circuit hardware description language input methods, with a wealth of simulation analysis. Which in this article, Multisim simulation software is to test the existence of the principle of circuit design error, analog circuit test devices were the work of the main effect of the actual circuit design and the choice of the actual circuit components to provide an analysis of the data, through Simulation of the effect, to decide how to set up the actual circuit.This article is the use of PCB production lithography process approach to achieve, and industrial plate is the same principle. Lithography is a graphic reproduction and chemical corrosion of a combination of precision surface processing technology. The purpose of lithography in the silicon dioxide or metal thin film etching with the mask above version fully corresponds to the geometry in order to achieve selective proliferation and the purpose of wiring metal film. Lithography process through research, so this article only when the production of PCB, to achieve a good result. In this paper, which is required by CCL etching, lithography is used to achieve the purpose of wiring metal film.Ultimately produced in the test circuit, the use of analog voice signal source output signal, the frequency between 20Hz to 20KHz, amplitude in between 20mV to 200mV. In this paper, the design of the audio transmission system, can achieve nearly 5 meters of signal transmission, and signal distortion, to achieve the desired objectives of the design. The effect of the signal from the transmission, the transmission of low-frequency signals for better results, fully able to meet the requirements of practical applications, but close to 20KHz frequency signal, the signal transmission of the output signal amplitude will be reduced slightly phenomenon. In practice, the external part of the signal amplification circuit to have a better signal amplification, so that in the practical application of which will have better results.In this paper, optical communications and free space optical communication research in the application of lithography process technology, based on the design of optical communications for short-range wireless audio transmission system, which is higher than the traditional cable transmission of a good technology, signal transmission in the future the development of a mainstream direction, with a huge space for development. If applied to the reality of rapid production of life, for saving raw materials, the promotion of environmental protection have a positive role. In this paper, the design of the main ideas, that is, to minimize space consumption and cost. Wireless optical communication with the traditional short-distance transmission compared to the more user-friendly, easy to achieve, fully reflect the new wireless optical communication transmission advantages. This design not only the value of the practical application of a broad, more good could be improved, and with the same design, only to be replaced more advanced electronic components, it is entirely possible to achieve a more long-distance signal transmission, and not just audio signal can transmit video signals.In terms of the teaching, but also has a positive meaning. Many domestic colleges and universities have opened optical communication courses, but there is no experimental support is perfect. If this article is based on the design of optical communication experiments corresponding classes can help students in learning at the same time the theoretical knowledge and practical experience of hands-production and the characteristics of optical communication opportunity, which is one of the role of design. |
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