The rapid development of the security industry will make the development of the HD optical transceiver market a bright future. For optical transceiver manufacturers, it is imperative to adapt to market demands and adjust development strategies in a timely manner. In order to be invincible in the security market, optical transceiver manufacturers must overcome the following technical difficulties.
Technical difficulties that single-fiber multi-channel high-definition video multi-service optical transceivers must go through 1) The clock system is complicated and difficult. For example, the input HD video stream is locked and the clock is recovered. The high-definition formats are diverse, and the user does not know the format of the actual video. Therefore, the video input must be adaptive. In this way, the system for locking the state of the reference clock becomes very complicated. Of course, there are other clock synchronization, lock, debounce and other processing.
2) Under the conditions of existing devices, costs, etc., it is very difficult to transmit multiple high-definition video. One HDSDI bandwidth has reached 1.485G. This is the main reason why the market has only single-channel high-definition video optical transceivers. To dismantle, embed, and assemble video in the 1.485G stream, without compromising video quality, you must have a very deep understanding of the HD video standard system.
3) General high-definition video transmission adopts YCBCR422 format, which requires 20BIT transmission, so it must be at least 10BIT SERDERS channel, and to ensure that there is no missing bit in the optical fiber transmission process (that is, no water in the transmission process, such as 8bit), thus Ensure high-definition video encoding accuracy, authenticity. In order to ensure that video encoding does not lose bits during transmission of optical fibers, it is necessary to have a relatively deep understanding of optical fiber transmission technologies (for example, scrambling and descrambling, ALIGN byte alignment, etc., which are both efficient and error-free).
4) Also, since each HD video is asynchronous, the clock frequency and phase are not uniform, multiple HD video streams cannot be multiplexed directly, and frame synchronization of multi-channel asynchronous HD video must be implemented. Due to the high speed and large storage capacity, it is not possible to use time domain adjustment methods like FIFO and RAM, and because the full real-time, high-speed video stream contains various clock, synchronization, and other information, each byte cannot be added. Can not be deducted, it can not be used to adjust the program speed. This is also the main reason why the market is in urgent need and there are no multi-channel HD video optical transceivers.
5) In order to reduce the transmission capacity and ensure the authenticity of high-definition video, only video valid data is transmitted. Due to the transmission process, various embedded synchronization signals, clock signals, and auxiliary data such as TRS, DE, HS, VS, XYZ, and VIP have disappeared. At the receiving end, it is necessary to regenerate various synchronization signals and assemble and generate video streams with the same format as the input. The HD video format has standard, non-standard, compatible 861, progressive, interlaced, frequency 50, 60HZ, etc., format generation state machine will become very complicated and heavy workload.
6) Due to complicated operations, it is necessary to deal with the frame structure, rate, and clock of various interfaces. It can directly output various high-definition video systems according to business requirements (such as SDI, HDSDI, HDMI, and audio embedding, de-embedding, etc.) to avoid the addition of various expensive converters. In addition, it can provide interfaces such as network, data, telephone, audio and so on.
Technical difficulties that single-fiber multi-channel high-definition video multi-service optical transceivers must go through 1) The clock system is complicated and difficult. For example, the input HD video stream is locked and the clock is recovered. The high-definition formats are diverse, and the user does not know the format of the actual video. Therefore, the video input must be adaptive. In this way, the system for locking the state of the reference clock becomes very complicated. Of course, there are other clock synchronization, lock, debounce and other processing.
2) Under the conditions of existing devices, costs, etc., it is very difficult to transmit multiple high-definition video. One HDSDI bandwidth has reached 1.485G. This is the main reason why the market has only single-channel high-definition video optical transceivers. To dismantle, embed, and assemble video in the 1.485G stream, without compromising video quality, you must have a very deep understanding of the HD video standard system.
3) General high-definition video transmission adopts YCBCR422 format, which requires 20BIT transmission, so it must be at least 10BIT SERDERS channel, and to ensure that there is no missing bit in the optical fiber transmission process (that is, no water in the transmission process, such as 8bit), thus Ensure high-definition video encoding accuracy, authenticity. In order to ensure that video encoding does not lose bits during transmission of optical fibers, it is necessary to have a relatively deep understanding of optical fiber transmission technologies (for example, scrambling and descrambling, ALIGN byte alignment, etc., which are both efficient and error-free).
4) Also, since each HD video is asynchronous, the clock frequency and phase are not uniform, multiple HD video streams cannot be multiplexed directly, and frame synchronization of multi-channel asynchronous HD video must be implemented. Due to the high speed and large storage capacity, it is not possible to use time domain adjustment methods like FIFO and RAM, and because the full real-time, high-speed video stream contains various clock, synchronization, and other information, each byte cannot be added. Can not be deducted, it can not be used to adjust the program speed. This is also the main reason why the market is in urgent need and there are no multi-channel HD video optical transceivers.
5) In order to reduce the transmission capacity and ensure the authenticity of high-definition video, only video valid data is transmitted. Due to the transmission process, various embedded synchronization signals, clock signals, and auxiliary data such as TRS, DE, HS, VS, XYZ, and VIP have disappeared. At the receiving end, it is necessary to regenerate various synchronization signals and assemble and generate video streams with the same format as the input. The HD video format has standard, non-standard, compatible 861, progressive, interlaced, frequency 50, 60HZ, etc., format generation state machine will become very complicated and heavy workload.
6) Due to complicated operations, it is necessary to deal with the frame structure, rate, and clock of various interfaces. It can directly output various high-definition video systems according to business requirements (such as SDI, HDSDI, HDMI, and audio embedding, de-embedding, etc.) to avoid the addition of various expensive converters. In addition, it can provide interfaces such as network, data, telephone, audio and so on.
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