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  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...

DWDM , that is, dense wavelength division multiplexing. "Dense" means that the wavelength channels are very narrow and very close to each other. Taking 100 GHZ dense WDM as an example, the spacing between adjacent channels is only 100 GHZ (or 0.8NM). That is, adjacent channels could be 1530.33NM, 1531.12NM, and 1531.90NM. The working principle of DWDM is to combine and simultaneously transmit multiple signals of different wavelengths on the same optical fiber. In other words, one optical fiber becomes multiple virtual optical fibers. Therefore, if you multiplex 8 OC-48 signals into a fiber, you will increase the transmission capacity of the fiber from 2.5 GB/S to 20 GB/S. Currently, through DWDM technology, the data transmission rate can reach 400GB/S.   DWDM is designed for long-distance transmission, and the wavelengths are closely combined during the transmission process to avoid the occurrence of dispersion and attenuation. And with the Erbium-Doped Fiber Amplifier (EDFA)...

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 ...

  With the widespread use of WDM systems, more and more problems are beginning to emerge, especially for long distance transmission WDM systems, where signal attenuation has become the primary problem. This is where the WDM optical amplifier repeater family ( OEO ) comes into play.   With the widespread use of WDM systems, more and more problems are beginning to emerge, especially for long distance transmission WDM systems, where signal attenuation has become the primary problem. Although some emerging amplifiers such as EDFA, FRA, SOA have solved the problem of signal attenuation, they are expensive in terms of cost, particularly dangerous in terms of use (FRA) and cannot be used when incompatible equipment needs to be connected (e.g. 1300nm carrier wavelength conversion for optical networks). Since we have different providers for our fibre networks and different standards, we need a certain device to transition from one fibre network to another. This is where the WDM optical...

For 5G commercial use, bearer first. With the accelerated deployment of 5G networks, as one of the basic carriers of the entire 5G industry, the demand for 5G fronthaul networks is becoming stronger and stronger. In the 5G era, the radio access network is mainly based on the C-RAN architecture, and the DU is deployed in a centralized manner, and multiple AAUs are connected through the fronthaul network. The main characteristics of the services to be provided by the 5G network include large bandwidth, low latency, and massive connections, which put forward new requirements for the bearer network in terms of bandwidth, capacity, latency, and networking flexibility. The traditional C-RAN 5G bearer network is mainly an optical fiber direct drive solution, which has problems such as large consumption of optical fiber resources, high cost, and inconvenient management and control; HTF is committed to building high-quality 5G fronthaul networks, 5G midhaul networks, and 5G backhaul Network, HT...

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