The ventilated condition of the warehouse of green laser pointer

Plastic optical fiber is very soft and can be bent, the processing is also very convenient, so in optical information processing, optical metrology, short-distance transmission, etc. have been better applied. In this experiment, the use of low-loss transmission fiber is imported plastic optical fiber, the fiber diameter, it is 1mm, the core diameter of 990μm, thin thickness of 5μm. Figure 1 shows an audio signal optical transmission system structure diagram, in which electro-optical conversion and analog channels for the transmission between the optical fiber; electro-optical conversion of part of the optical signal before sending part, mainly by the modulation circuit, drive circuit and composed of light-emitting diode LED ; analog channels after the part optical signal receiving part, mainly by silicon photovoltaic cells, pre-amplifier circuit and the circuit. The factory is working on the new revision of working instruction of green laser pointer.
Background noise filtering technology issues, if the use of narrow-band optical filtering techniques, but also there is the laser frequency stability of technical problems. Understand the basic structure of electro-optic modulator; familiar with the basic principles of laser atmospheric communication; master audio signal of the laser atmospheric communication debugging techniques; explore the impact of the effect of laser atmospheric communication factors. Adjust electro-optic modulators, modulator rotation, changes in the amplitude of the carrier signal, waveform, frequency changes, only a suitable place in a maximum amplitude, frequency signal generated. Laser atmospheric communication experiment, the rotating analyzer, oscilloscope waveform amplitude changes on the speaker sound will be smaller, rotating modulator, wave size and frequency of the sound changes. The equipment of manufacturing green laser pointer needs to be maintained.
Integrated with DWDM equipment. Rapid service provisioning. Rapid atmospheric laser communication network construction, simple operation, flexibility, strong, temporary emergency situations can be opened for quick service. Other special occasions. As the laser communication system both atmospheric optical fiber communication and wireless communication advantages, can be applied to other needs of high-speed access in the terminal, some of the wiring should not be large or dangerous places. Military applications. As the light frequency much higher than the wave frequency, but also has good resistance to electromagnetic interference. The communication capacity is sufficient to meet the needs of tactical and even strategic communications, low power consumption, simple structure, easy to carry, fast and flexible networking is another highlight its advantages, so the atmosphere laser communication system is also suitable for short-range information in short-range mobile security line communication. The dispatcher adjusted the worker number of the day shift of green laser pointer .
In particular Turbo code and RS (30, 10) this system the two error-correcting codes have better error correction performance, the effect of significantly improving system performance, they are correcting the error rate of the system in 10 ? 5 the following. Rain in the general weather conditions in the system, the average bit error rate remains at 10 ? 4, the use of RS (15, 9) and LDPC codes for atmospheric laser communication systems to improve performance, improve the system bit error rate of 10 ? 6. If the sunny and cloudy days in the case, error correction, the average bit error rate before the system has less than 10 ? 7, the BER after error correction is to achieve a 10 ? 9. The ventilated condition of the warehouse of green laser pointer can ensure the good working status of led flash light .