In essence, there is no obvious boundary or difference between the optical transceiver and the photoelectric converter. They both make a conversion degree between the optical signal and the electrical signal. Practical use: photoelectric converters (commonly known as "transceivers"), generally use channels to transmit data signals; and optical transceivers generally refer to video optical transceivers, which are used to transmit video signals, and there are also those that transmit voice signals. Optical transceiver. Next, let's follow the editor of Feichang Technology to learn more about the difference between the optical transceiver and the photoelectric converter!
1. Introduction to
Optical Transceiver Optical Transceiver is the terminal equipment for optical signal transmission. Due to the improvement of the current technology and the reduction of the price of optical fiber, it has been well applied in various fields (mainly reflected in the security monitoring). Therefore, the manufacturers of various optical transceivers have sprung up like bamboo shoots after a rain. However, most of the technologies of the manufacturers here are not fully mature, and the development of new technologies requires capital, manpower and material resources. Most of these manufacturers are small and medium-sized enterprises, and various brands have also appeared one after another. But the quality is still the same. Foreign optical transceivers are good but expensive. Therefore, domestic manufacturers have transformed their production of optical transceivers to meet domestic needs.
Optical transceiver classification:
analog optical transceiver
analog optical transceiver adopts PFM modulation technology to transmit image signals in real time. The transmitting end performs PFM modulation on the analog video signal, and then performs electrical-optical conversion. After the optical signal is transmitted to the receiving end, it performs optical-electrical conversion, and then performs PFM demodulation to recover the video signal. Due to the PFM modulation technology, the transmission distance can reach 50Km or more. Through the use of wavelength division multiplexing technology, the two-way transmission of image and data signals can also be realized on an optical fiber to meet the actual needs of monitoring projects.
Digital optical transceiver
Since digital technology has obvious advantages in many aspects compared with traditional analog technology, just as digital technology has replaced analog technology in many fields, the digitization of optical transceiver is also an inevitable trend. Digital video optical transceiver mainly has two technical methods: one is MPEG II image compression digital optical transceiver, and the other is all-digital uncompressed video optical transceiver.
System principle: The
optical transmission system consists of three parts: light source (optical transmitter), transmission medium, and detector (optical receiver).
According to the transmission signal, it can be divided into digital transmission system and analog transmission system.
In an analog transmission system, the input signal is converted into a continuous change in the amplitude (frequency or phase) of the transmission signal. The optical fiber analog transmission system analog modulates the light intensity, and the modulation power of the light source changes with the amplitude of the modulation signal. However, due to the serious non-linearity of the light source, its signal-to-noise ratio, transmission distance and transmission frequency are very limited.
The digital transmission system transforms the input signal into a pulse signal represented by "1" and "0", and uses it as a transmission signal. Restore it to the original information at the receiving end. In this way, the nonlinearity of the light source has little effect on the digital code stream. In addition, digital communication can adopt some coding error correction methods, and it is easy to realize multiplexing. Therefore, the digital transmission system has a great advantage and is obtained in many places. It has a wide range of applications.
2. Introduction to
photoelectric converters Photoelectric converters (also known as optical fiber transceivers) are divided into 100M optical fiber transceivers and gigabit optical fiber transceivers. It is a fast Ethernet with a data transmission rate of 1Gbps and still uses CSMA/ The CD access control mechanism is compatible with the existing Ethernet. With the support of the wiring system, the original fast Ethernet can be smoothly upgraded and can fully protect the user’s original investment. Gigabit network technology has become a new network and transformation The preferred technology, which also improves the performance requirements of the integrated wiring system. Related brands include TP-link, TC-net, Sanwang Communications, Hanxin Communications, etc., among which there are industrial grades and commercial types. The general commercial type has lower parameters and narrower ranges; the industrial grade has better performance. , Suitable for industrial environment.
Performance characteristics:
1. Flexible optical port configuration, supporting SC/ST/LC, single-mode/multi-mode
2. Low-voltage redundant DC dual power supply or AC power supply
3. IP30 and above protection level
4. Working temperature can support -40℃ ～75℃
3. The difference between optical transceiver and optical transceiver
About the difference between optical transceiver and optical transceiver; first of all, we can see from their functions. Video optical transceiver is a device that converts video; audio; Ethernet; audio; switch; data and other signals into optical signals for transmission. Fiber optic transceiver is a device that converts Ethernet into fiber optic transceiver.
The transceiver only performs photoelectric conversion, does not change the encoding, and does not perform other processing on the data. The transceiver is for Ethernet, runs the 802.3 protocol, and is only used for point-to-point connections.
In addition to the photoelectric conversion work, the optical transceiver also multiplexes and demultiplexes the data signal. Usually the optical transceiver comes out with multiple pairs of E1 lines. SDH, PDH optical transceivers are mainly used by telecom operators to provide multi-pair point-to-point data circuits; video optical transceivers are mainly used in security monitoring, remote education, video conferencing and other fields that require high timeliness of video transmission. At the same time, it can Transmission control, switching, voice, Ethernet and other signals to meet the needs of multi-service applications, so we sometimes call it an integrated optical transceiver.
Well, the above content is the detailed introduction of Feichang Technology on the difference between optical transceiver and photoelectric converter, I hope it can be helpful to everyone! Feichang Technology has been specialized in the R&D, production and sales of industrial communication equipment such as optical transceivers, industrial switches, optical fiber transceivers, and protocol converters for 20 years. Welcome to come to understand and exchange.
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