Detailed analysis of the functions of several common fiber optical multiplexers

Time : Jul. 15, 2022    View : 60

Many people may be unfamiliar with the optical multiplexer, some even know but not much. In fact, the optical multiplexer is an optical fiber communication device that extends data transmission. It uses signal modulation, photoelectric conversion and other technologies to achieve the purpose of long-distance transmission . Today, we will tell you what are the main functions of some common optical multiplexers. Let’s take a look together next!


What are the functions of the optical multiplexers?

       The role of PDH optical multiplexer:

PDH (Plesiochronous Digital Hierarchy, quasi-synchronous digital series) optical multiplexer is a 120-channel photoelectric transmission equipment composed of ultra-large-scale integrated circuits. It is generally used in pairs, also called point-to-point applications. Small-capacity switch networking, user loop network, mobile communication (base station), private network, DDN network, etc. Its main features are: the use of ultra-large-scale integrated chips, with low power consumption and high reliability. Provide E1 remote loopback test function, easy maintenance. 120 provides 4 E1 channels; has a complete alarm function, which can display local and remote alarms. Alarm information (including power failure alarm) can be reported to the peer end through the network management channel. Adopt transceiver integrated optical device, the working performance is stable and reliable. The single-board design of the whole machine is compact and easy to use.


       The role of SDH optical multiplexer:

SDH (Synchronous Digital Hierarchy, synchronous digital series) optical multiplexer has a large capacity, generally 16E1 to 4032E1.


       The role of SPDH optical multiplexer:

       SPDH (SynchronousPlesiochronousDigitalHierarchy) optical multiplexer, between PDH and SDH. SPDH is a PDH transmission system with the characteristics of SDH (Synchronous Digital Series) (based on the principle of code rate adjustment of PDH, and at the same time using part of the networking technology in SDH as much as possible).


       The role of video optical multiplexer:

Video optical multiplexer is a device that converts 1 to multi-channel analog video signals into optical signals through various codes and transmits them through optical fiber media. Since the video signal is converted into an optical signal through two technologies, analog conversion and digital conversion, so Video optical multiplexers are further divided into analog optical multiplexers and digital optical multiplexers.


       The role of Ethernet optical multiplexer:

Ethernet optical multiplexer, also known as optical fiber transceiver, intelligent adaptive fast Ethernet photoelectric converter. It can realize data transmission between two different network transmission media, twisted pair and optical fiber. This photoelectric converter can extend the transmission distance of the network from 2Km to 100Km (copper wire) without the help of any other converters.


        The role of audio optical multiplexer:

        The audio optical multiplexer is an audio device that converts the traditional audio analog signal into an optical signal at the transmitting end, transmits it to the receiving end through an optical fiber, and then converts it into an analog signal at the receiving end. The main function of Hua Tiancheng’s Aifeng intercom optical multiplexer is to extend the audio signal.


       The role of data optical multiplexer:

The function of the data optical multiplexer is to digitize the image, voice and data signals to be transmitted, and then multiplex these digital signals to convert multiple low-speed digital signals into one high-speed signal, and convert this signal into light. Signal. At the receiving end, the optical signal is restored to an electrical signal, the restored high-speed signal is decomposed into the original multi-channel low-speed signal, and finally these data signals are restored to image, voice and data signals.


       The role of VGA/HDMI optical multiplexer:

       These two optical multiplexers use VGA interface, HDMI interface, uncompressed digital high-definition video and high-speed digital optical fiber transmission technology respectively. It supports the transmission of video signals with resolutions up to 1080p, and has the characteristics of high-definition without delay.


       The role of HD-SDI optical multiplexer:

       HD-SDI optical multiplexer is a device that converts SDI signals to optical signals. The principle of the SDI optical multiplexer is that the transmitting end modulates the SDI signal into an optical signal by a laser, and the receiving end re-encodes the data received by the laser diode into an SDI signal.


       Summary: The function of the optical multiplexer is to transmit data remotely, and transmit audio and video over a long distance. It has the advantages of long transmission distance, no delay, and no interference.