High definition transmission is the basis of high quality optical transceiver

The primary function of the optical transceiver is the transmission of images, so the quality of the image signal is the main consideration for evaluating the quality of the optical transceiver. At present, the market is mainly digital optical transceivers, and its video transmission is not affected by the transmission distance, and the image quality has been greatly improved compared with the analog optical transceiver.

First of all, the continuous development of optical transceiver products and the continuous maturity of optical module technology complement each other and promote each other. With the increasing miniaturization, low power consumption, high speed, long distance, intelligent development of optical modules, and the application of a series of new technologies, the performance of optical modules has been greatly improved, which not only enables transmission over longer distances, but also enables The gain is automatically adjusted to better adapt to a wider operating temperature range, ensuring high quality and highly reliable transmission of signals such as images.

Secondly, the digital signal processing and then transmission of the analog signal is a leap and development of the optical transceiver technology. The optical transceiver first passes the analog video through digital coding (A/D conversion), and then realizes the optical fiber transmission through circuit multiplexing, and the receiving device restores the digital code to the analog video signal. The digital optical transceiver solves the shortcomings of the analog optical transceiver with small transmission capacity, low service energy, easy signal attenuation, and easy crosstalk. Its transmission advantage emerges---the transmission capacity is large, the service types are many, and more importantly, the signal quality is improved. At a higher level, the signal-to-noise ratio of video images can reach 67-72db under 10bit or 12bit digital code quantization, far exceeding the parameter index of about 45db of analog signals at a long distance, achieving true broadcast quality.

Third, the choice and manufacturing process also play a decisive role in image transmission quality. In the field of optical transceivers, good products can be said to be mainly designed, not produced. The ideas and solutions from the beginning of product design have already determined its quality. Therefore, the important part of optical transceiver is the design idea. , program optimization and device selection. If the market positioning of some manufacturers determines that the product cost is low, the choice of the scheme is likely to be satisfied only to achieve the basic functions. Some circuits such as filtering, shaping, current limiting, and voltage limiting will be omitted. At the same time, for the circuit. Some of the chips, formal channels and parallel imports, refurbished secondary chips and other price differences are large, the quality will also have a long way to go, these are to solve the cost and loss of product quality. In addition, if there is a flying wire during production, when the chip component is hand soldered due to uneven stress and the chip is damaged, the image quality will be seriously disturbed, the output signal amplitude is seriously low, and the image appears streak and jitter. Not synchronized, etc.

The image quality transmitted by the video optical transceiver is relatively small in the one-way video application matched with the camera. The image transmission quality can not be distinguished by the naked eye. However, this cannot be said that the optical transceiver has no technical threshold. The increase in two-way transmission of multiple digital signals and the improvement of image quality will place higher demands on product technology.