Optical transceiver development prospects are optimistic

The optical transceiver is a terminal device for optical signal transmission. Due to the improvement of current technology, the reduction in the price of optical fiber has made it well applied in various fields. Therefore, the manufacturers of optical transceivers are like bamboo shoots. However, the technology of most manufacturers is not fully mature. The development of new technologies requires cost, manpower, and material resources. This leads to the fact that many manufacturers are small and medium enterprises. Therefore, the domestic manufacturers to transform the production of optical transceivers out of the way to meet domestic needs.

Optical transceivers two major categories

At present, security video surveillance still uses coaxial cables as the transmission medium for short-distance signal transceiving; with the impact of IP, TCP/IP protocol network transmission is also increasingly used. However, no matter which transmission method, it can not meet the transmission needs of modern security. Optical terminal as a transmission medium terminal equipment, it is also essential in the entire transmission.

Analog optical transceiver

The analog optical transceiver adopts the PFM modulation technology to transmit the image signal in real time, which is currently used more often. The transmit end first performs the PFM modulation on the analog video signal, and then performs the electro-optical conversion. After the optical signal is transmitted to the receiving end, the optical-electrical conversion is performed, and then the PFM demodulation is performed to recover the video signal. Due to the adoption of PFM modulation technology, the transmission distance can easily reach about 30Km, and the transmission distance of some products can reach 60Km or even hundreds of kilometers. Moreover, the image signal has little distortion after transmission, and has a high signal-to-noise ratio and little nonlinear distortion. Through the use of wavelength division multiplexing technology, it is also possible to realize bidirectional transmission of image and data signals on a single optical fiber to meet the actual needs of the monitoring project.

Digital optical transceiver

Since digital technology has obvious advantages in many aspects compared with traditional analog technologies, just as digital technology has replaced analog technology in many areas, the digitalization of optical transceivers is also an inevitable trend. At present, there are two main technical methods for digital image optical transceivers: one is an MPEGII image compression digital optical transceiver, and the other is a non-compressed digital image optical transceiver. Image compression digital optical transceivers generally use MPEGII image compression technology, which can compress moving images into N×2Mbps data streams and transmit them over standard telecommunications interfaces or directly over optical fibers. Due to the use of image compression technology, it can greatly reduce the signal transmission bandwidth.

Optical transceiver application field analysis

Video optical transceivers have entered the Chinese market for more than 20 years. The earliest application of video optical transceivers was mainly concentrated in the public security, military, government and other capital conditions are better, there is an urgent need for video services, and require higher transmission efficiency of the industry. As domestic optical transceivers continue to mature and improve with technology, many fields are urgently applied to:

city ​​of peace

As is known to all, the Safe City project is an extremely large and comprehensive management system. It involves a very wide range of issues. It not only needs to meet the requirements of urban security management, traffic management, and emergency command, but also takes into account disaster accident warning, safety production monitoring, etc. On the other hand, the demand for image surveillance also needs to consider the system linkage requirements of the government agencies, units, and companies that have established networks, and the integration of alarm, access control, and intercom systems, as well as linkage with broadcasting systems. In the Safe City project, the share of video optical transceivers is minimal, but the project is huge. In some large projects, the purchase amount of video optical transceivers can reach three to four million yuan.

Urban Intelligent Transportation

After the late 1980s and early 1990s, with the acceleration of China’s industrialization process, a large number of people have flooded into cities, and transportation problems have become increasingly prominent. In order to ensure the normal operation of urban transport, Beijing, Shenzhen, Shanghai, Nanjing and other cities have all established urban traffic monitoring networks. In the current IP network monitoring is not yet mature, most of the traffic information is transmitted through the optical fiber, video optical transceivers play a decisive role. In the monitoring of urban roads, video optical transceivers are mainly used for traffic statistics of city intersections, switching of traffic lights, capturing of illegal vehicles, and monitoring of traffic accidents. They are responsible for uploading these video information to traffic monitoring command centers to ensure The normal operation of city traffic.

Urban Rail Transit

With the rapid development of urban transportation and highway construction in our country, the requirements for equipment in the monitoring system are getting higher and higher. Because the optical fiber transmission has the advantages of wide bandwidth, long transmission distance and anti-interference, it is widely used. Due to its many transmission advantages and the drastic increase in market demand in recent years, optical transceivers have significantly reduced the cost of optical cables and have entered a relatively benign industrial development track.

At present, safe cities, urban intelligent transportation, highways, and urban rail transit projects are the major markets for optical transceivers. According to the forecast of authoritative agencies, the investment in China's urban rail transit market will reach 415.9 billion yuan in 2010-2015, with an average annual compound growth rate of 13.8%, of which rail transit will be at least 2-3 billion yuan, and the annual domestic intelligent transportation system will be approximately With a scale of 20 billion yuan in investment, video surveillance products account for about 16% of the total, and annual new market demand is about 3.2 billion yuan.

Opto-electronics manufacturers should improve the industrial chain

HD-SDI emerged as an HD optical transceiver to enter the market. In 2010, it became the first year of HD in the surveillance industry, and the concept of “HD” in the video optical transceiver industry also began to rise. Huawei has introduced high-definition video optical transceivers covering the HDMI, DVI, SDI and other industrial interfaces. OPT Optec, **, Jiangsu Xinchuang and other manufacturers have also launched their own high-definition optical transceivers.

At present, the application of high-definition products is in full swing. On the market, high-definition video surveillance solutions mainly include IP-based network HD and HD-SDI-based real-time HD. HD-SDI HD directly transmits non-compressed video signals over coaxial cable or fiber to achieve true real-time HD. HD-SDI HD is widely used in more fields due to its ability to provide richer image details, smooth upgrade from traditional SD video surveillance systems to HD video surveillance systems, and real-time, standard, and high reliability.

With the rise of HD-SDI, high-definition optical transceivers have appeared in certain applications in highway projects and safe city construction, but HD-SDI is only a revolutionary outbreak after all, and it cannot be a trend of video surveillance. In addition, HD The optical transceiver (mainly the HD-SDI interface) technology is still not mature enough, and the product series is not complete. Currently, the business functions that can be done are mainly video data; the cost of the chips and modules is high, causing the overall cost to be much higher than standard-definition optical transceivers. Therefore, the majority of manufacturers of optical transceivers also need to strengthen their R&D strength, improve their technologies and products, form a relatively complete industrial chain, increase the number of equipment shipments, and reduce costs; for new things, manufacturers need to intensify their service, and in-depth Customer contact and communication to enhance customer confidence in the use of the program.