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The Wavelength Division Multiplexing (WDM) system is a passive, optical solution for increasing the flexibility and capacity of existing fiber lines in high-speed networks. By adding more channels onto available fibers, the WDM System enables greater versatility for data communications in ring, point-to-point, and multi-point topologies for both enterprise and metro applications. Do you know about WDM system? 5 concepts provided in this blog may help you easily get it. Optical Transmission Optical transmission is the conversion of a digital stream of information to light pulses. The light pulses are generated by a laser source (LED or vessel) and transmitted over an optical fiber. The receiver converts the light pulses back to digital information. Wavelength Division Multiplexing WDM is based on the fact that optical fibers can carry more than one wavelength at the same time. The lasers are transmitting the light pulses at different wavelengths that are combined via filters to one sin...

DWDM, simply put, multiplexes optical signals of different wavelengths into the same optical fiber for transmission. DWDM technology is one of the basic technologies widely used in modern optical communication networks. It can improve the speed, capacity and reliability of optical communication. So in what areas is it specifically applied? This article will take you through the application scenarios of the DWDM transmission system. DWDM technology is mainly used in three major areas: broadband services, mobile services, and dedicated line network services. Three diagrams are used below to show where the DWDM transmission system is in these application fields and what role it plays. 1.Application scenarios of DWDM/OTN transmission system-broadband business 2. Application scenarios of DWDM/OTN transmission system - mobile services 3.Application scenarios of DWDM/OTN transmission system-dedicated line network business HTF's independently developed DWDM/OTN Optical Transmission Platfo...

DWDM transmission is an optical communication technology that uses dozens or even hundreds of optical signals of different frequencies to transmit information through an optical fiber. With the continuous growth of global data transmission volume, the future development prospects of DWDM transmission technology are very broad. The following is a report on the future development of DWDM transmission : 1. Market demand With the rapid development of the Internet and the Internet of Things, the demand for data transmission continues to increase. In the future, with the promotion of 5G technology, the amount of data transmission will continue to increase. According to market research institutions, the global DWDM transmission market will reach US$15 billion by 2025. 2. Technological Innovation With the continuous innovation of technology, DWDM transmission technology is also constantly developing. Currently, DWDM transmission has achieved large-scale integration and distributed deployment. ...

  In the 19th Asian Games that has ended, e-sports became an official event for the first time, and it is the "top class" among all events. Behind the scenes, do you know what supports such a fast event? It is a reliable underlying network. E-sports competition: Every millisecond of excitement and fairness is based on a reliable network. Under the craze, the ever-evolving competitions and the constant construction of venues have also exposed the differences between e-sports and other sports events. The fairness and excitement of e-sports require far more network requirements than other events: the deployment of e-sports network includes the deployment of competitive platforms. Dedicated network for players, audio intercom network, director network for compiling broadcasts, network for distributing live streaming platform, office network for staff, etc. Fairness is the most basic prerequisite for sports competition. In e-sports, network fluctuations and failures at the millise...

  DWDM Optical Add/Drop M ultiplexer ( OADM ) is a passive optical device used in WDM networks for adding and dropping one/multiple 100 GHz DWDM channels in the C-band into one or two fibers, while letting the rest of the wavelengths bypass to the needed destination. DWDM OADM modules are available in single-side (East or West) and dual-side (East and West) configurations. With matching MUX/DEMUX units placed at each end of an optical link, multiple data channels can be combined and transmitted over a single-mode fiber trunk. The passive OADM modules can add or drop 2, 4, 8 data channels at any point along the trunk.

  WDM : Wavelength division multiplexing is a technology that simultaneously transmits two or more optical  signals of different wavelengths in the same optical fiber. CWDM  : Coarse wavelength division multiplexing, generally covering wavelengths of 1270~1610nm , DFB lasers will be used , the channel spacing is relatively wide, usually 20nm , the main application, a total of 18 waves, relatively low cost, mainly used in Aggregation layer and access layer. So it can be used for our fronthaul, CWDM6 application. DWDM : dense wavelength division multiplexing, the wavelength interval will be relatively small, 0.2nm~1.2nm . The main working wavelengths are 1525nm~1565nm in C -band and 1570nm~1610nm in L- band . It focuses on long-distance transmission and is applied to the transmission network. Therefore, the low-loss C -band is selected, and EML lasers are usually used. To ensure the wavelength, they are all equipped with TEC , so the cost of the device will be relatively h...

  Since the first quartz filament was pulled out in 1930, we have truly entered the era of optical fiber. So far, we already have various types of optical fibers, such as multi-mode optical fiber G.651, single-mode optical fiber G.652, G.653, G.654, G.655 and so on. These fibers form the basis of our entire optical communications.   So how is light transmitted in an optical fiber?   Say we want to shine a flashlight beam down a long, straight hallway at the other end, just point the beam straight down the hallway, the light travels in a straight line, and we know it's fine. What if the corridor has a bend? At this time, a mirror can be placed at the corner to reflect the beam at the corner. What if the hallway is very winding, with multiple bends? It is also possible to line the walls with mirrors and angle the beam of light so that it bounces from side to side along the hallway. This is exactly what happens when light travels through an optical fiber, but the light is to...

CWDM (Coarse Wavelength Division Multiplexing) is a technique for combining multiple optical signals on a single fiber by using different wavelengths of light. CWDM technology is widely used in modern communication networks, and it enables significant cost savings while improving network capacity and flexibility. CWDM multiplexers are at the core of this technology, allowing multiple data streams to be combined and transmitted over a single optical fiber. What is a CWDM Multiplexer? A CWDM multiplexer is an optical device that combines multiple wavelengths of light into a single optical signal. It uses the principle of combining different wavelengths of light into one fiber to transmit signals from multiple sources. Each wavelength is modulated with a unique data stream, and the CWDM multiplexer combines these signals into a single fiber. The signal is then transmitted to the receiver where it is de-multiplexed back to its original form. Advantages of CWDM Multiplexer The benefits of ...

Wavelength division multiplexing (WDM) is a technology in which two or more optical carrier signals of different wavelengths (carrying various information) are converged together at the transmitting end by a multiplexer and coupled into the same optical fiber of an optical line for transmission. CWDM: wavelength spacing of 20 nm, with relatively wide wavelength spacing. DWDM: wavelength interval is between 0.2 and 1.2nm.   Wavelength division multiplexer commonly used in two kinds: filter-type mux demux, chip-type AAWG (flat top, Gaussian) Do you know the principle of filtered mux demux ? Please see the following diagram At the Mux end, the light of various wavelengths is passed through the filter individually, then reflected and coupled into a single fiber for transmission. At the demux end, all wavelengths of light pass through the filter together, filtering out one wavelength of light, reflecting all other wavelengths to the next filter, then filtering out the next wavelength of...

Wavelength division multiplexing (WDM), including CWDM (coarse wavelength division multiplexing) and DWDM (dense wavelength division multiplexing), etc. It refers to the coupling of multiple signals of different wavelengths on a single fiber for simultaneous transmission.   It has multiplexer and de-multiplexer. The multiplexer (MUX) combines multiple signal wavelengths in a single fiber for transmission at the transmitter side; the de-multiplexer (DEMUX) separates multiple wavelength signals transmitted in a single fiber at the receiver side. The main purpose of WDM is to increase the available bandwidth of the fiber, which can be expanded by WDM without the need to lay more fibers. What is the difference between CWDM and DWDM?   - Different wavelength intervals CWDM: wavelength interval ≥20nm, usually using eight bands of 1470~1610nm with 20nm interval, (HTF: 1270nm~1610nm) DWDM: wavelength interval <10nm, usually using 1550~1570nm band with wavelength interval of 200GHz...

HT6000-CH20 is HTFuture high-capacity transmission platform . It is suitable for national,provincial, and metro core network levels to meet TBit capacity requirements. It is the industry’s most cost-effective transmission application platform. Granular WDM transmission solution . ☆Standard 19 inch 5U chassis ☆The single sub-rack supports up to 76 channels of 10G service conversion ☆The single sub-rack supports up to 19*16 wavelength multiplexing and demultiplexing ☆High integration: a single rack supports 19 general service slots and 1 network management slot. ☆Unified platform: supports mixed insertion of various service cards and unified network management; ☆High reliability: support 2xDC -48V, 2xAC 220V dual power protection; ☆Good heat dissipation performance: 4 high-performance, high-speed fan design to ensure sufficient heat dissipation

With the rapid development of data services, the bandwidth requirements of the transmission network are becoming increasingly high. The traditional PDH or SDH technology, which uses a single wavelength for optical signal transmission, is a great waste of optical fibre capacity, as the bandwidth of optical fibre is almost unlimited compared to the single wavelength channels currently utilised. It not only significantly increases the capacity of the network, but also makes full use of the broadband resources of the optical fibre, reducing the waste of network resources. HT6000 is DWDM optical transmission system which is HTF Self-developed, to meet the need for network development，support expand your capacity to 3.6T  

 Two important developments in fibre optic communication are the increase in transmission rate and the extension of transmission distance. As the transmission rate increases, the factors that limit the transmission distance during signal transmission become more numerous, such as chromatic dispersion, non-linear effects, polarisation mode dispersion, etc., which also affect the simultaneous increase of both. In addition there is no ideal digital channel in the actual transmission process, the signal will always have aberrations and delays in the transmission process of various media, which means error codes and jitter. To reduce the impact of these adverse factors, industry experts have proposed Forward Error Correction, or FEC (Forward Error Correction) for short. FEC is short for Forward Error Correction. Forward Error Correction is a type of error control, which refers to a technique where a signal is pre-processed according to a certain algorithm for coding before being sent i...