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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  

A splitter is a component of a PON network and is a passive device that connects the OLT to the ONU. Its function is to distribute downlink data and concentrate uplink data. The splitter has one uplink optical interface and several downlink optical interfaces. The optical signals coming from the uplink optical interface are distributed to all downlink optical interfaces for transmission, and the optical signals coming from the downlink optical interface are aggregated to the only uplink optical interface for transmission. Only when the optical signal is transferred from the uplink optical interface to the downlink optical interface, the optical signal strength/optical power will decrease, and the same applies when transferring from the downlink optical interface to the uplink optical interface. The strength of the optical signal can be the same or different from one downlink optical interface to another. Splitter principle of operation In single-mode optical fibres conducting optical s...

By using standard optical modules (such as CFP and QSFP28), 100G transfers within the data center are possible. Although they are well suited for transmitting 100G traffic within racks and data centers, this can become a problem when 100G traffic needs to be transmitted over long distances (for example, long connections between different data centers (for example, over 40km)). This requires a 100G DWDM optical module. Since DWDM SFP transceivers are widely used for scaling up 10G network capacity, DWDM technology is not new to the industry. In terms of functionality, the 100G DWDM is very similar to its predecessor. However, it is often used for longer distances in a 100 gigabyte network. PAM4 and Coherence are two industry-leading solutions that offer greater bandwidth and transmission distance. When comparing 100G DWDM PAM4 to a coherent optical module, it depends on what functions the network needs and benefits from. In this article, we will analyze both options to help businesses ...

 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...

Dense Wavelength Division Multiplexing (DWDM) is the ability to combine a set of optical wavelengths for transmission over a single fibre. DWDM technology is an extension of optical networks and the main advantage of DWDM is that it is protocol and transmission rate independent, allowing DWDM-based networks to transmit data over IP, ATM, SONET, SDH and Ethernet. DWDM systems typically have the following optical components: DWDM optical modules, DWDM MUX/DEMUX, DWDM OADM and optical amplifiers. Today we talk about EDFA . The EDFA optical amplifier is an optical fibre amplifier that uses erbium ions as a gain medium. Optical amplifiers amplify optical signals over a wide range of wavelengths, which is important for DWDM system applications. In contrast to EDFAs used in CATV or SDH systems, EDFAs used in DWDM systems are sometimes referred to as DWDM EDFAs. To extend the transmission distance of DWDM systems, one can choose from different types of optical amplifiers, including DWDM EDFAs...

Optical Transponder Units (OTUs) are an integral part of DWDM transmission systems. Do you know why an OTU is needed for DWDM systems?  Role of OTU Realizes wavelength conversion, as well as single/multi-mode conversion and regenerative amplification of optical signals. Operating principle of OTU Wavelength conversion is achieved using the optical-electrical-optical conversion method. Firstly, the optical signal received by the client optical module from the client equipment is converted into an electrical signal, which is amplified, shaped/clocked and then the electrical signal is modulated to the output of the laser. The output is a DWDM wavelength, so that multiple DWDM signals can be merged into a single fibre for transmission via Mux. Non-DWDM optical modules cannot be transmitted via DWDM technology without an OTU.