Dispersion Compensation Module Manufacturer

DCM fiber optic dispersion compensation module issued by HYD TECHNOLOGY, 1U rack-mounted passive compensation module. 20/40/60/80/100/120km.. can be customized according to different kilometers.

Custom Dispersion Compensation Module Manufacturer -HYD TECHNOLOGY

The dispersion compensation module launched by HYD TECHNOLOGY is a new type of single-mode fiber designed for the existing G.652 & G.655 standard single-mode fiber.
The dispersion of the G.652 standard optical fiber at a wavelength near 1550nm is positive (17~20) ps/(nm·km).

The dispersion of G.655 standard fiber at 1550nm wavelength is positive (4~6) ps/(nm·km).

And it has a positive dispersion slope, so it is necessary to add a dispersion compensating fiber with negative dispersion to these fibers for dispersion compensation to ensure that the total dispersion of the entire fiber line is approximately zero, so as to achieve high speed, large capacity, and long distance Communication.

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dcm dwdm


DCM optical fiber dispersion compensation module is a pure passive optical device, which is mainly used in the optical transmission system to repair the optical signal deformed by dispersion and compensate the damaged signal to improve the performance of the optical transmission system.

DCM Fiber Dispersion Compensation Module Application Matching

40ch DWDM MUX + MON with EDFA and DCM, can transmit up to 85km distance in point-to-point link

DCM Fiber Dispersion Compensation Module Plug and Play

The DCM card has the performance of plugging and using, and can be directly inserted into the slot of 1U/2U/4U chassis, suitable for integrated multi-service transmission system

DCM fiber optic dispersion compensation module has eye protection design

The fiber optic connector is designed at an inclined angle to protect the user’s eyes and avoid possible damage to the eyes due to direct laser irradiation during the use of DCM

screw fixed

There are two fixing screws on the front panel, the DCM card can be installed and removed by rotating the screws without any installation tools

Centralized control and efficient management

HYD-OLP1 is an optical line protection device in the multi-service transmission (FMT) system launched by HYD TECHNOLOGY. The FMT system is designed to provide high-capacity optical fiber networks with

The 100G DWDM solution can improve management efficiency and save cabinet space through centralized control of link devices

NMC— HYD TECHNOLOGY self-developed management system

NMC (Network Management Controller) is a network management system independently developed by HYD TECHNOLOGY. The NMC card is equivalent to a network administrator and can configure and monitor the status of each line card in the link.

Local management on the network via RS232, Telnet, Web or SNMP

HDC series products

HDC series is a complete set of optical products launched by HYD TECHNOLOGY for DWDM long-distance transmission network applications, including various chassis, accessories, active and passive line cards, etc.

All products can be customized with specific parameters according to customer needs to meet different application requirements

At present, optical fiber linear communication has defects such as fiber dispersion, fiber loss and nonlinearity, which can no longer meet the requirements of current information processing and transmission. 

There are two main factors affecting optical fiber transmission characteristics: loss and dispersion. The dispersion problem has become the main obstacle for upgrading and expanding the optical fiber communication system.

Dispersion in single-mode fiber is divided into two types: chromatic dispersion and polarization mode dispersion.

In recent years, erbium-doped fiber amplifiers (EDFA) and Raman amplifiers have been widely used and researched, which also solves the problem of fiber loss. 

The development of various compensation technologies such as non-zero dispersion-shifted fiber (NZDSF) and pre-chirp, Chromatic dispersion is no longer a major constraint on transmission performance.

In other words, the influence of loss and chromatic dispersion in single-mode optical fiber on the transmission characteristics of optical fiber communication system is no longer the main factor hindering the development of optical fiber communication in the direction of high speed and large capacity.

Only by compensating the polarization mode dispersion in the optical fiber can the transmission performance of the optical communication system be improved, and at the same time, the hundreds of millions of kilometers of optical cables that have been laid around the world can be effectively used. 

How to compensate the polarization mode dispersion has become the development of the next generation of high-speed optical fiber communication system. major technical challenges.

Dispersion means that different colors and different frequencies of light are separated from each other due to different propagation speeds when they are transmitted in optical fibers.

 The main dispersion of single-mode fiber is group delay dispersion, that is, wave optics dispersion and material dispersion. These dispersions will lead to the broadening of the optical pulse, which will cause distortion during signal transmission and increase the bit error rate of reception.

Four dispersion terms are illustrated here: 

material dispersion, waveguide dispersion, modal dispersion, and polarization mode dispersion.
Material dispersion: 

This is because the refractive index of the fiber material varies nonlinearly with the optical frequency, and the light source has a certain spectral width, so different wavelengths cause different group velocities.

Waveguide dispersion: This is the dispersion caused by the different group velocities of a guided mode at different wavelengths (the light source has a certain spectral width).

 It is related to the waveguide effect of the fiber structure, also known as structural dispersion.
Intermodal dispersion: 

In multimode fiber, intermodal dispersion is caused by the difference in group velocity between the guided modes. 

When multiple guided modes of the transmitter are excited at the same time, each guided mode has a different group velocity and arrives at the receiving end at different times.

Polarization mode dispersion: 

Ordinary single-mode fiber actually transmits two mutually orthogonal modes. In fact, there are a small amount of random uncertainty and asymmetry in the single-mode fiber which causes the group delay of the two polarization modes to be different ,that leads to polarization mode dispersion.

In the high-speed long-distance transmission system above 10Gbit/s, the problem of dispersion compensation must be considered. Dispersion compensation includes chromatic dispersion compensation and polarization mode dispersion compensation.

Group velocity dispersion compensation methods for high-speed optical fiber systems, some of which are representative of fundamental mode/higher-order mode dispersion compensation fibers, dispersion compensation fiber gratings, higher-order mode dispersion compensators, and VIPA VisualImagePhase Array) devices.

It is also possible to take certain measures at the moment of signal modulation and reception to reduce the influence of dispersion, such as adding wither during signal modulation, and performing dynamic dispersion compensation at the receiving end.

Chromatic dispersion compensation methods include dispersion compensation devices and dispersion compensation modules. At present, the most widely used dispersion compensation module (DCM) is mainly composed of dispersion compensation fiber DCF. 

However, this dispersion compensation fiber has a strong nonlinear effect. It will increase the crosstalk between different channels.

In the 40Gbit/s system, changes in environmental factors will cause random fluctuations in the size of the dispersion. Therefore, the dispersion compensation module is also required to be tunable, and dynamic dispersion compensation is required. 

Related technologies include chirped fiber grating dispersion compensation, ring resonators , virtual phase arrays, phase plate gratings deposited with heated metals, optical switches connected to long-period gratings based on high-order mode fibers, multi-cavity reflection filters, etc., but there are not many commercially available products.

For overcoming polarization mode dispersion (PMD), there are currently two solutions. One is to solve the PMD problem on the line.

The use of new, good performance, low PMD coefficient optical fibers, and the use of new modulation formats for optical signals make optical signals less susceptible to PMD. This method is less expensive and can only be used with new fibers.

The second method is to use PMD compensation technology to dynamically adjust and manage PDM. This method is expensive, but it can allow network operators to continue to use the original old fiber.

Qualified Dispersion Compensation Module Manufacturer -HYD TECHNOLOGY

HYD Technology‘s series modules of dispersion compensation are used to resolve many issues of distance limitation arising from the dispersion and distortion on the optical communication system, which is a long-term transmission system.

This module is entirely transparent and can be connected in series with the communication line. It also works well with the amplification device in the optical communication system.

Dispersion Compensation Module

DCM (dispersion compasation module )Improves optical transmission quality and stability.

Dispersion compensation module can be added in pre-compensation, compensation before the signal enters the optical fiber

Reduce signal distortion, thereby improving the performance and reliability of communication systems

Post-compensation funtion, supplementing the dispersion of the last cross-section, and adjusting the dispersion of the entire multiplexing section. Therefore, DCM needs to be added at both the sending end and the receiving end to meet the dispersion compensation and solve the nonlinear effect problem

Keep optical signals of different wavelengths synchronized in optical fibers

DCM can be used in the line compensation, compensating for the multiplex section dispersion before and after the OLA site. It can maintain the accurate transmission of signals in long-distance optical fiber transmission, thereby enhancing the efficiency of optical communication systems.

DCM in DWDM With high precision and high stability

In the optical communication system, we hope to get a higher signal rate and a longer transmission distance; but there will be nonlinear effects in long-distance transmission, and a dispersion compensation module (DCM) is required at this time

Profesional Dispersion Compensation Module Manufacturer

The dispersion compensation module is a dispersion compensation technology used in optical fiber transmission in optical communication systems.
During the transmission of optical signals in the optical fiber, due to the slight difference in the propagation speed of optical signals of different wavelengths in the optical fiber, the signal will be distorted and the communication quality will be affected.

The dispersion compensation module introduces special optical components, such as fiber gratings, etc., to precisely adjust the delay of optical signals of different wavelengths to eliminate signal distortion caused by dispersion, thereby improving the transmission quality and stability of the optical communication system.

These modules are usually used in long-distance communication links for optical fiber transmission to ensure accurate transmission of signals and improve transmission performance and transmission reliability of communication systems.

It perfectly solves the dispersion effect of the fiber itself and the dispersion caused by the optical frequency modulation (chirp) caused by self-phase modulation (SPM) in the fiber system, and is especially suitable for long-distance transmission in CATV systems.


In short, material dispersion and waveguide dispersion are caused by the fact that the signal transmitted by the fiber is not a single frequency, and the mode dispersion is caused by the signal transmitted by the fiber is not a single mode.

Optical Fiber Dispersion Representation

DCM series dispersion compensation module is a dispersion compensator made of high-tech laser engraving grating and optical circulator.

Compared with the compensator made of dispersion compensating optical fiber technology, the metal compensator has the characteristics of large dispersion compensation and small insertion loss;

DCM Dispersion Compensation Module

The time delay does not represent the dispersion value, and the time delay difference is used to represent the dispersion value. 

If the time delay of each signal component is the same, there will be no dispersion, and the signal will not be distorted during transmission. 

The delay difference can be caused by the different transmission speeds of each frequency component of the signal, or by the different transmission speeds of each mode of the signal.


DCM module can be placed anywhere in the optical fiber transmission network, but when the transmission rate and distance are further increased, its nonlinear effect will be highlighted, and different placement positions have different effects on the system

Fiber Bragg grating dispersion compensation module has attracted more and more attention because of its characteristics of no electromagnetic interference, high sensitivity, small size, light weight and low insertion loss.

In an optical fiber, signals of different speeds will have different delays when passing the same distance, resulting in a delay difference.

The greater the delay difference, the more serious the dispersion. Therefore, the time delay difference is often used to represent the degree of dispersion.

If you have specific needs that aren't met by our existing products, we offer customization services to fulfill your requirements.

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