Passive WDM Equipment Manufacturer

Passive WDM plays an extremely significant role in the performance optimization of modern transmission systems. In the transmission process, the use of passive WDM can not only improve the connection effect of the transmission structure, but also reduce resource occupation during transmission and improve transmission efficiency.

The Application of PASSIVE WDM Technology

passive wdm

Several application models of passive WDM

Passive WDM (wavelength division multiplexing) technology can be applied to a variety of scenarios. The following are several common application models:

1. Point-to-point connection:

    – Data Center Interconnection: Connecting two or more data centers so that they can share resources and data.

    – Enterprise Extended Network: Connects two or more branches of an enterprise.

2. Fiber to the x (FTTx):

    – Fiber to the Home (FTTH): Bringing optical fiber directly into homes to provide users with high-speed Internet connections.

    – Fiber to the Building (FTTB): Fiber is connected to a building and then served through other technologies to all residents of the building.

3. Metropolitan Area Network (MAN):

Uses passive WDM technology to expand and enhance network capacity within a city or metropolitan area.

4. Remote office access:

Provides high-speed Internet connectivity to remote office locations, such as branch offices or home offices.

5. Wireless base station backhaul:

 Supports high-speed data transmission between wireless base stations (such as cell towers) and core networks.

6. Video surveillance network:

 Provide high-bandwidth data transmission for the city’s CCTV surveillance network.

7. Redundancy and Failover:

 Create redundant paths to the network to provide backup if the primary path fails.

8. Content delivery network (CDN) interconnection:

 Provides high-speed connections for each node of the content delivery network.

These application models can help enterprises and service providers effectively expand and enhance their network capacity and coverage without requiring additional power or complex electric equipment.

Scenarios /Solution with passive WDM

Passive WDM (Wavelength Division Multiplexing) technology, especially CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing), has its unique value in many application scenarios. The following are some common passive WDM application scenarios:

1. Data Center Interconnect (DCI):

 High-capacity, low-latency connections between data centers are often required. Passive WDM technology provides a high-bandwidth, cost-effective method for short- and mid-range interconnections between data centers.

2. Enterprise network expansion:

For large enterprises that require high-speed connectivity across multiple buildings or sites, passive WDM is a cost-effective expansion solution.

3. Last-mile access:

In FTTx (such as FTTH, FTTC, etc.) applications, passive WDM technology can help service providers provide multiple services on a single fiber, thereby utilizing existing fiber assets more efficiently.

4. Wireless base station back transmission:

With the launch of 4G and 5G networks, wireless base stations require higher back transmission capacity. Passive WDM technology provides a cost-effective solution for the connection between base stations and core networks.

5. Remote office and branch office connections:

Passive WDM technology provides high-bandwidth connections between branch offices, remote offices and main office locations.

6. Metropolitan Area Network:

In metropolitan area networks, passive WDM technology provides a high-capacity solution for connecting different network nodes or data centers.

7. Video surveillance and transmission:

Passive WDM can be used to transmit high-definition video between CCTV cameras and central monitoring points in cities or enterprises.

8. Fiber Rental:

Provides fiber leasing services to organizations that require short-term, high-bandwidth connectivity, such as events, exhibitions, or other temporary needs.

9. Redundant network paths:

 Provide backup routes for critical network paths to improve network reliability and redundancy.

Overall, passive WDM technology is an attractive solution in a variety of application scenarios due to its simplified design and deployment, high reliability, and economic benefits.

passive wdm in 5G fronthaul

How to customize your passive WDM solution

Customizing passive WDM solutions often requires consideration of multiple factors to ensure specific business and technical needs are met. Here are some key steps and considerations to help you customize your passive WDM solution:


1. Determine needs:

    – Bandwidth requirements: Estimate current and future data transmission needs.

    – Connection distance: Consider the maximum transmission distance you need to cover.

    -Application scenarios: such as data center interconnection, metropolitan area network, last mile access, etc.


2. Select WDM type:

    – CWDM (Coarse Wavelength Division Multiplexing): Suitable for short and medium distances, with wider wavelength spacing.

    – DWDM (Dense Wavelength Division Multiplexing): Suitable for long distance and ultra-long distance, with tighter wavelength spacing and higher channel capacity.


3. Choose the right components:

    – Multi-wavelength laser: select the appropriate wavelength according to the selected WDM type.

    – Passive WDM Multiplexer/Demultiplexer: Choose based on your channel and bandwidth needs.

    – Fiber type: e.g. single mode or multimode, as well as the length and quality of the fiber.


4. Network topology:

    – Point-to-point: The simplest configuration, a direct connection between two locations.

    – Ring or mesh: for added redundancy and fault tolerance.


5. Compatibility and Scalability:

Ensure that the solution is compatible with existing equipment and can be easily expanded to meet future needs.


6. Budget and Cost:

Consider the cost of the overall solution and compare it to your budget.


7. Supplier selection:

Choose experienced and reputable suppliers who can provide technical support and warranty services.


8. Testing and Validation:

 Before deployment, the solution is thoroughly tested to ensure its performance and reliability.


9. Installation and Maintenance:

Consider the complexity of the actual deployment and develop a plan for maintenance and troubleshooting.


10. Training and Support:

Ensure the team understands the operation and maintenance of the new system and receives the necessary support from the vendor.


Finally, when customizing a passive WDM solution, a best practice is to work with an experienced optical communications engineer or consultant who can provide technical advice to ensure the solution meets your needs.

passive WDM

Why Choose HYD TECHNOLOGY for Your Passive WDM Solution

In modern network construction, due to the surge of broadband transmission volume, it brings great pressure to optical fiber broadband transmission.

In the development of transmission technology, the use of HYD TECHNOLOGY passive wavelength division technology equipment can improve the efficiency and safety of the transmission system from all aspects.

Especially with the assistance of passive wavelength division technology equipment, the structure of the transmission system has been effectively enhanced, and the advantages in the improvement of the transmission system are significant. It is also an important direction for the development of passive wavelength division technology equipment in the transmission field in the future.

In terms of reducing the cost of the transmission system, HYD TECHNOLOGY uses passive wavelength division technology equipment to aggregate the ports of multiple transmission terminals, closely following the opportunity of the advancement of transmission technology, and providing high-quality services to better serve network users.

What is passive DWDM?

Passive DWDM refers to a system or solution that uses DWDM (Dense Wavelength Division Multiplexing) technology but does not rely on any motor components such as amplifiers or converters. In such a system, all signal processing, multiplexing and demultiplexing are done in the optical domain, and there is no need to convert signals into electrical signals.

Here are some key features of passive DWDM:

1. Multiplexer/Demultiplexer:

 Passive DWDM systems use optical multiplexers to combine multiple optical signals of different wavelengths into a single fiber, and demultiplexers to separate multiple signals of different wavelengths from the optical fiber. .

2. No amplification required:

 Since passive DWDM systems do not have amplifiers, they are typically used over shorter distances, such as inter-data center interconnects or metropolitan area networks, where signal loss can be compensated by providing sufficient initial power.

3. Cost-effectiveness:

Due to the lack of expensive electric components, passive DWDM is generally more economical than active DWDM systems, especially in short-distance transmission.

4. Simplified design and deployment:

 Passive systems are generally simpler and easier to deploy because they do not require power or complex management and monitoring.

However, without electric components such as amplifiers, the transmission distance and capacity of passive DWDM systems may be limited. When longer transmission distances or greater signal capacity are required, active DWDM systems may need to be considered.

What is Active WDM vs. Passive WDM?

WDM technology allows multiple wavelengths of optical signals to be transmitted simultaneously on a single optical fiber. Depending on whether the system requires power supply to drive certain functions, WDM can be divided into active WDM and passive WDM.

1. Active WDM:

     * Contains components that require power supply, such as amplifiers, transponders, and electrical modulators.

     * Can enhance the signal, thereby increasing the transmission distance.

     * Generally used for long distance transmission and high bandwidth applications.

     *Example: Optical amplifiers such as EDFA (Erbium-doped Fiber Amplifier) are used to amplify signals in DWDM systems, and they require power to work.

2. Passive WDM:

     * Does not include any components requiring power.

     * Relying solely on passive devices such as splitters and multiplexers to operate.

     * Typically used in short-range, low-cost and low-maintenance applications such as enterprise networks or short-distance data center interconnects.

     *Example: CWDM (Coarse Wavelength Division Multiplexing) is often passive and uses optical multiplexers and splitters to combine or separate signals at different wavelengths.

Overall, the choice of using active or passive WDM depends on the specific application, distance, budget and required bandwidth.


What are the passive components in WDM?

In WDM (Wavelength Division Multiplexing) systems, passive components refer to devices or components that do not require external power supply and only rely on incident optical signals to work. Here are some common passive components:

1. Multiplexer/Demultiplexer (Mux/Demux):

 These devices can combine multiple signals of different wavelengths into one optical fiber for transmission (multiplexing), or separate signals of multiple wavelengths from one optical fiber. out (demultiplexing).

2. Optical Splitter:

This is a device used to split an optical signal into multiple identical signals. It is often used in fiber-to-the-home (FTTH) or other point-to-multipoint optical communication applications.

3. Optical Attenuator:

 Used to reduce the intensity of optical signals to prevent overloading or other problems at the receiving end.

4. Optical Isolator:

 Allows optical signals to be transmitted in only one direction, preventing reverse propagation of optical signals from interfering with the system.

5. Optical Circulator:

 It allows optical signals to pass through multi-port devices in a clockwise or counterclockwise direction.

6. Wavelength Selective Switch (WSS):

 Although WSS can be active in some applications, it can also be used as a passive device without the need for power to specify a signal path for a specific wavelength. .

7. Optical Cross-Connect (OXC):

 This device can switch input and output optical channels in a fiber-optic network, usually as a node in the network.

The above are only some of the passive components in WDM systems. The actual system design may select and use these components based on needs, applications and technological progress.


1. Wavelength division multiplexing:

At the sending end, the passive wdm  combines optical signals of different wavelengths through optical splitters (such as fiber gratings, optical waveguide arrays, etc.), so that they are transmitted on the same optical fiber . In this way, optical signals of multiple wavelengths can be simultaneously transmitted on the same optical fiber, which improves the utilization rate of the optical fiber.

2. Optical signal attenuation and dispersion during transmission:

During optical signal transmission, due to the loss and dispersion characteristics of the optical fiber itself, optical signals of different wavelengths will be affected to varying degrees during transmission. 

The passive wdm equipment minimizes the attenuation and dispersion of the optical signals of each wavelength during the transmission process by selecting an appropriate optical splitter and adjusting the parameters of the optical fiber.

3. Demultiplexing:

At the receiving end, the passive wdm demultiplexes the received optical signals through another optical splitter, and separates optical signals of different wavelengths.

Then, the optical signal is converted into an electrical signal through a photoelectric converter, and then the signal is demodulated and filtered through the corresponding electrical signal processing technology, and finally the original signal is restored.

Demand for broadband

At present, in the construction of the network transmission system, different transmission technologies are applied.

At this stage, with the continuous innovation of network transmission media, there has been great development both in terms of performance and coverage.

In terms of transmission system access, it is necessary to focus on the continuous improvement of broadband demand in actual transmission, and strengthening the technical transformation of the original broadband transmission system has become an important trend.

Passive WDM equipment is based on passive wavelength division technology.

By improving the transmission capacity and bandwidth of traditional optical fiber broadband, it can solve the transmission and access needs of the network communication system, thereby promoting the improvement of the transmission system.
The broadband access of the transmission system requires the terminal equipment connected to the optical fiber trunk line in the network to establish a technical connection between the network transmission users and the network transmission system, and form a transmission target under the multi-user demand in the equipment.

Traditional optical fiber broadband, in the case of a surge in network transmission demand, it is difficult to use traditional methods to meet the coverage requirements of network traffic.

When building a network transmission system, it is necessary to consider aggregated broadband ports and use more efficient and stable interruption devices to connect The transmission trunk line lays the foundation for the use of passive WDM equipment technology.

Passive WDM technology equipment is not only small in size, but also can be used for multi-port simultaneous network transmission, and has low energy consumption, which enables the optimization of modern broadband transmission systems to be realized.

Business security

When the network transmission system serves a large number of traffic demands, it needs to guarantee a high degree of security and build protection measures for transmission ports.

The terminal equipment connected to the backbone of the broadband transmission system needs to better deal with the transmission security issues that often occur during the network transmission construction in the port connection.

The solution to transmission security is a necessary guarantee for the stability and reliability of network transmission, especially in the case of increasing network transmission services at this stage, it needs to be satisfied by using corresponding technical equipment.

Passive wavelength division technology equipment has obvious advantages in terms of transmission service security.

Passive WDM technology equipment can improve the speed and efficiency of the downshifting of terminal equipment data in the trunk line of the transmission system, and combine with the optical cables in the transmission system to transfer all ports of the transmission system under the passive wavelength division technology mode Carry out aggregation;

By using the unified router equipment of the system to carry out transmission protection, so that the transmission system can improve the protection performance, and the unified routing protection can concentrate the protection resources of the transmission port, reducing the resource consumption of the system when ensuring transmission security, and improving The economic benefit level of the transmission system.

Application of passive WDM equipment in transmission system

Application of passive WDM equipment in system construction

In the practical application of passive wavelength division technology equipment, it has great advantages in improving and perfecting the traditional system structure.

In optical fiber transmission, passive wavelength division technology equipment can be used, and multiple devices can be used in a concentrated manner, so that it can respond to multi-user aggregation network transmission requests in modern broadband transmission.

Especially in a relatively dense network structure system, multiple transmission ports can be connected on the transmission fiber structure of the trunk line.

In the transmission system structure, in order to improve the transmission efficiency, one optical fiber is often used to drive multiple transmission devices.

This requires the use of passive wavelength division technology equipment, and through port aggregation performance, one routing device can serve multiple transmission devices. The purpose of the transport port.

Passive wdm technology equipment can improve the transmission efficiency of access in the port downlink, increase the transmission traffic, and at the same time enhance the aggregation transmission capability in the use of a single terminal device.

Application of passive WDM equipment in long-distance transmission

In the network transmission system, due to the significant expansion of the application range of the LAN, when using passive wavelength division technology equipment, the advantages of point-to-point transmission can be actively used.

In the LAN system, it can better meet the requirements of large traffic and long distance Transport needs.

In the service form of passive WDM equipment, an appropriate transmission method can be selected according to the actual needs of network transmission, such as transmission speed and wavelength, which can greatly improve the original LAN service performance.

Especially in the transmission mode of different speeds, the transmission network can be combined to increase and expand the transmission system.

When expanding the transmission system, under the framework of passive wavelength division technology, the one-way transmission mode can be changed to form a two-way or even multi-way transmission form to meet the actual needs of different transmission ports.

Application of passive WDM equipment in network construction

In modern network construction, the advantages of passive wavelength division technology equipment can be actively used to improve efficient services for multi-task hybrid applications.

In the process of optical cable transmission, passive WDM technology equipment can better respond to the resource requirements of broadband optical fiber users and enhance the performance of data transmission;

especially in areas that need optical fiber transformation and upgrading, they can rely on passive wavelength division technology A device that enables a transport system to simultaneously connect multiple port trunk connection points.

In network construction, passive wavelength division technology equipment can be applied to implement deployment of optical fiber transmission, and form a more reliable transmission guarantee in multi-service and large-scale transmission.

Nowadays, optical fiber access technology based on passive optical network technology has been widely used in various forms around the world.

In order to meet the development needs of higher speed, more transmission wavelengths, and wider coverage of future optical access networks, new FTTx (Fiber To The X: Fiber Access) technologies emerge in an endless stream, and WDM-PON is also one of the key technologies. Next, follow ETU-LINK to see WDM-PON passive wavelength division multiplexing technology.

What is passive WDM technology ?

Let’s first talk about what are PON and WDM technologies? A Passive Optical Network (PON) refers to a type of optical network that uses optical cables, splitting and combining mechanisms between the central office equipment (OLT) and various end-user devices (ONU/ONT).

This connection is facilitated by the Optical Distribution Network (ODN) and its associated components.

Currently, the PON technologies used for broadband access mainly include EPON and GPON. WDM (Wavelength Division Multiplexing) is wavelength division multiplexing, a technology that uses multiple lasers to simultaneously transmit multiple laser beams of different wavelengths on a single optical fiber. 

As an important supplement to the 5G fronthaul solution, its basic idea is to save optical fiber, which is the main way to expand the transmission capacity of optical fiber and increase the speed.

What is WDM-PON ?

WDM-PON is a point-to-point passive optical network using wavelength division multiplexing technology, that is, in the same optical fiber, the number of wavelengths used in both directions is more than 3, and the uplink access can be realized by using wavelength division multiplexing technology.

Increase users’ access to broadband several times or even dozens of times to meet the ultimate needs of users. A typical WDM PON system consists of three parts: Optical Line Terminal (OLT), Optical Wavelength Distribution Network (OWDN) and Optical Network Unit (ONU).

A straightforward WDM-PON approach involves having multiple light sources of varying wavelengths in the OLT. Each ONU utilizes a specific wavelength light source, and every point-to-point link operates based on its predetermined wavelength.

WDM-PON solution

The biggest feature of WDM-PON is that the ODN (Optical Distribution Network) is composed of passive devices such as optical splitters (Splitter), and does not contain any active electronic devices and electronic power supplies.

The reason why WDM-PON can become a 5G fronthaul solution is related to the technical characteristics it embodies, as follows:

  1. Long transmission distance: The insertion loss is smaller than that of the optical power splitter in the traditional TDM PON system, and the network coverage is larger.
  1. High transmission rate: each ONU uses independent and different wavelength channels, no special MAC protocol is required, and the system complexity is reduced.
  1. High bandwidth: Each user exclusively enjoys the bandwidth of one wavelength channel, does not require dynamic allocation of bandwidth, and meets the bandwidth requirements of 25G eCPRI fronthaul signals.
  1. High security: All ONUs are physically isolated and will not affect each other.
  1. Low cost: The optical modules used by the ONU are exactly the same, which solves the problem of device storage, and the 32-40 waves of a single fiber can be expanded to 80 waves, saving the cost of backbone optical fibers and OSP.
  1. Easy maintenance: Due to the application of colorless light source technology in WDM PON, maintenance is more convenient.

WDM-PDM technology solves the problems of transmission efficiency, bandwidth and cost well, and provides favorable support for the realization of fixed-mobile convergence.

Passive WDM technology in 5G fronthaul

With the deployment of 5G networks, wireless fronthaul has become even more critical. Traditional 4G and previous networks typically used CPRI (Common Public Radio Interface)-based fronthaul solutions, while 5G is driving the need for higher bandwidth, lower latency and higher connection density. In this context, optical technology, especially passive WDM (Wavelength Division Multiplexing), plays a key role in 5G fronthaul.

The following are the main applications of passive WDM in 5G fronthaul:

1. Cost saving:

Passive WDM does not require power supply and complex management systems, which can greatly reduce the total cost of ownership (TCO).

2. Bandwidth efficiency:

 Passive WDM can combine multiple wavelengths on a single fiber to provide higher bandwidth and support multiple 5G cells or gNodeB sites.

3. Simplified deployment:

 Since passive WDM does not require power supply and complex configuration, deployment becomes simpler and faster.

4. Increase fiber capacity:

In places where fiber resources are limited, passive WDM can help network operators maximize existing fiber assets, thereby avoiding expensive new fiber laying.

5. Meet multi-site requirements:

5G networks require more cells or sites than previous networks. Using passive WDM technology, multiple sites can be supported on a single fiber, reducing fiber and hardware requirements.

6. Reliability and Stability:

 Passive WDM solutions are generally more reliable and stable due to the lack of moving parts and power requirements.

7. Support C-RAN architecture:

 5G fronthaul solutions are usually based on the centralized radio access network (C-RAN) architecture, in which the remote radio head (RRH or RU) is linked to a centralized baseband unit (BBU) through the fronthaul. Passive WDM is a key technology in this architecture because it can connect multiple RRHs to a pool of BBUs without requiring large amounts of fiber.

Overall, passive WDM technology provides an efficient, reliable and cost-effective solution for 5G fronthaul to support the high bandwidth, low latency and high connection density requirements in 5G networks.

Custom Passive WDM Manufacturer in China -HYD TECHNOLOGY

Passive Wdm Supplier

The network structure is relatively simple, the number of sites is small, the business volume is small, and there is no network management requirement.

Passive Optical Multiplexer Provider

Easy to use: Passive WDM is a plug-and-play WDM system, which is simple and convenient to use

Passive Dwdm Mux Manufacturer

The main device is passive WDM, no power supply is required, and the failure rate is low

Passive Cwdm Multiplexer Factory

The cost of building a passive WDM system is relatively low

High Performance Passive WDM Systems To Boom Your Business

Commitment to achieving zero defects and recalls

Offering a range of WDM products to cater to different client needs

Customizable solutions for unique passive WDM requirements


Regularly introducing new and enhanced products

Focused on meeting the evolving demands of the telecom industry

Understanding client needs and providing tailored solutions

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