From analog to digital to cross the optical transceiver market or will be big reshuffle

The optical transceiver products play an extremely important role in the entire monitoring system as a connection and transmission medium. Longitudinal tourism terminal products in the field of security more than ten years of development track, from the 90s of last century, the first generation of CCTV CCTV monitoring system will have the optical transceiver. Today, the low barriers to technology, serious homogeneity of products, and disorderly market competition have caused the common failure of products in the security industry to be transmitted to the video and optical industry. The acceleration of the IP process has placed optical products on a severe test. Faced with the rapid development of digitalization, what challenges will the optical transceiver manufacturers face?

The development of video optical transceiver in China is accompanied by the development of video surveillance. Video optical transceiver is a device that converts 1 to multi-channel video electrical signals into optical signals through optical fiber media. Video optical transceivers can be divided into analog optical transceivers and digital optical transceivers. . When the analog optical transceivers became popular, it was a lot of sweetness. Therefore, the manufacturers of optical transceivers in various places have mushroomed. Although compared with the monitoring front-end equipment, the optical transceiver market share still has a certain gap, but it is also monitoring a huge market space, providing a great opportunity for the development of optical transceivers.

In the period of simulation monitoring and playing the protagonist, the analog optical transceiver has always been regarded as a mainstream product with the monitoring front-end equipment. However, with the advent of digital optical transceivers, the disadvantages of analog optical transceivers also emerge: analog optical transceivers need amplitude modulation, frequency modulation, and phase modulation due to modulation of carrier signals because they need to perform amplitude modulation, frequency modulation, and phase modulation on electrical signals. The change is difficult to achieve true linear modulation, nonlinearity will inevitably cause signal distortion; at the same time the modulated carrier signal must be modulated into an optical signal. The nonlinearity of the optical device is related to the change of the ambient temperature and the stability of the operating voltage, and the optical signal Long-distance transmission in the optical fiber will cause the optical signal power attenuation, transmission frequency drift, phase distortion, optical signal dispersion effect will also cause distortion of the optical signal; the optical signal arrives at the receiving end, the receiving optical device still has to cause nonlinear distortion, The photoelectrically converted analog signal enters the demodulator, and demodulation generates the same nonlinear distortion as the modulation. These signal distortion distortions are inherent and inevitable. Therefore, the quality of analog video transmitters for transmitting video, audio, and data is difficult to achieve satisfactory results. In addition, the capacity of the signal transmitted by the analog optical transceiver is limited, and the bandwidth of the optical fiber cannot be fully utilized, and the number of transmitted signals is also relatively small.

The crossover of the optical transceiver market from analog to digital or the large reshuffling of digital technologies has obvious advantages in many aspects compared with traditional analog technologies. For example, image compression technology is used, which can greatly reduce the signal transmission bandwidth. The all-digital uncompressed video optical transceiver adopts all-digital non-compression technology, so it can support high-resolution motion and distortion-free transmission of still images. It overcomes the serious interference of conventional analog FM, phase modulation, and amplitude modulation multi-channel signal transmission at the same time. Easily affected by environmental interference, poor transmission quality, and low long-term operating stability. And support audio two-way, data bidirectional, switch bidirectional, Ethernet, telephone and other signals in parallel transmission, convenient field wiring, plug and play.

Although some domestic companies have developed digital optical transceivers since 2001, after 10 years, they still do not completely occupy the entire optical transceiver market. According to Li Xiaokang, general manager of Beijing Haoxiang Zhongda Technology (Trading) Co., Ltd., although digitization is a general trend, it is impossible to completely replace simulation in a short period of time. Simulation has undergone a long history of development. It is a symbol of the times, and change is carried out step by step. We will mainly use digital optical transceivers, but we will also work for the old optical transceiver customers to ensure that they use the normal supply of products.

There are also two types of digital video optical transceivers: one is a non-compressed digital video optical transceiver and the other is a digital optical transceiver using image encoding compression. Digital transmission of light without compression can guarantee real-time and image clarity. When the user's optical fiber resources are sufficient, and emphasize the need to pay attention to image quality, non-compressed video signal transmission is the best choice. Video compression digital optical transceivers generally use H. 264 image compression technology, due to the use of image compression technology, it can greatly reduce the signal transmission bandwidth.

Before and after 2005, the optical transceiver market demand began to increase rapidly. With the rapid development of optical transceiver technology and the increasing popularity of applications, the production and sales threshold for video optical transceivers is getting lower and lower. A large number of small workshop companies have started to sell generic products in the market. Most of these products are manufactured in a shoddy manner, with poor quality and extremely low service life, which disrupts the normal production and sales order of domestic optical transceivers. Unregulated market operations and vicious price competition have affected the healthy development of the industry.

Since 2005, a group of manufacturers of video and optical transceivers have taken the lead in R&D to conduct R&D of new-generation technologies. The typical development of optical transmission and switching platform technologies has been the focus. Pokang, Zhongwei, and frogwatch have all developed optical platform products that are different from traditional video optical transceivers. Optical platform technology combines high-speed optical fiber transmission networks, high-speed large-capacity real-time exchange, and IP network transmission. 264 codec, digital uncompressed video and many other technologies, the essence of which is a set of high-quality digital optical fiber based on the large-scale, high-quality video network monitoring of the overall solution. The integrated digital optical transmission and switching system for integrated services can well solve the requirements of multi-level transmission/exchange and management, and is a new technology platform for optical transceiver technology development. The system's products can also well support the access of various topological image distributions, such as star, chain, ring, and hybrid topologies.

It can be said that the digital signal processing after analog signal transmission is a leap forward in the development of optical transceivers. However, technological progress is endless. We believe that with the continuous advancement of the optical transceiver technology and the turbulent market, there will be a major reshuffle of optical transceiver companies and they will be ready to meet the challenges of the IP surveillance era.