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DWDM Device

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wHAT IS DWDM?
 
DWDM tech

Overview of dWDM technology

 

DWDM technology leverages the bandwidth and low-loss characteristics of single-mode optical fibers by using multiple wavelengths as carriers, allowing multiple carrier channels to simultaneously transmit within the optical fiber. In comparison to conventional single-channel systems, Dense Wavelength Division Multiplexing (DWDM) not only significantly enhances the communication capacity of network systems, fully utilizing the bandwidth of optical fibers but also offers advantages such as simple scalability and reliable performance. Importantly, it can directly accommodate various services, making its application prospects extremely promising.

 
 

WDM

 

In analog carrier communication systems, to fully utilize the bandwidth resources of cables and increase the system's transmission capacity, frequency division multiplexing is commonly employed. This involves simultaneously transmitting several signals with different frequencies on the same cable, and the receiving end uses bandpass filters to filter out the signal of each channel based on the different frequencies of each carrier.

Similarly, in optical fiber communication systems, frequency division multiplexing of light can be used to increase the system's transmission capacity. In fact, such a multiplexing method is highly effective in optical fiber communication systems. Unlike frequency division multiplexing in analog carrier communication systems, in optical fiber communication systems, light waves serve as the carriers of signals. The low-loss window of the optical fiber is divided into several channels based on the different frequencies (or wavelengths) of each channel's light wave. This allows for the multiplexing transmission of multiple optical signals within a single optical fiber.


 

DWDM-combines-optical-carriers-on-a-single-fiber-for-transmission

 

The ITU International Telecommunication Union's standard for DWDM wavelength is 1528.77nm-1563.86nm, mainly in the C-band with low attenuation and dispersion. The 100 GHz (0.8nm) wavelength interval can have 40 channels, and the 50 GHz (0.4nm) wavelength interval can have 80 channels.

 

 

 

 

 
 
CLASSIFICATION OF DWDM SYSTEM
Open-DWDM-system

Open DWDM System

The characteristics of an open DWDM system include no specific requirements for the optical interfaces of the multiplexing terminals, as long as these interfaces adhere to the optical interface standards recommended by ITU-T. The DWDM system employs wavelength conversion technology to convert the optical signals from multiplexing terminals into specified wavelengths. The optical signals from different terminal devices are transformed into different wavelengths that comply with the optical interface standards recommended by ITU-T. Subsequently, these signals are combined through wavelength multiplexing.

Integrated DWDM system

An integrated DWDM system does not utilize wavelength conversion technology. Instead, it requires that the wavelength of the optical signals from multiplexing terminals adheres to the specifications of the DWDM system. Different multiplexing terminal devices transmit signals at different wavelengths that comply with the recommendations of ITU-T. This ensures that when they access the multiplexer, they occupy distinct channels, thereby completing the process of wavelength multiplexing.

Integrated-DWDM-system

 

WORKING PRINCIPLE OF DWDM SYSTEM
 
Dual-fiber-unidirectional-transmission

Dual-fiber Unidirectional Transmission

In a unidirectional WDM system, the communication is typically one-way, with signals traveling in a single direction along the fiber. 

Advantages: Different wavelengths enable multiple independent channels to share the same fiber without interfering with each other, optimizing the use of the optical medium. 

Disadvantages: It supports communication in one direction only. For applications requiring bidirectional communication (such as in some local access networks), additional measures or separate channels may be needed. And the initial deployment costs of WDM systems, including lasers, amplifiers, and demultiplexers, can be relatively high.

Single-fiber bidirectional transmission

Unlike unidirectional WDM, a bidirectional system enables communication in both the upstream and downstream directions. Upstream signals (from user to central office) and downstream signals (from central office to user) share the same fiber, each using a different set of wavelengths.

Advantages: Bidirectional WDM maximizes the utilization of the available optical fiber capacity by supporting communication in both directions simultaneously.

Disadvantages: Designing and planning a bidirectional WDM network can be complex. Bidirectional WDM systems often require more sophisticated equipment, such as bidirectional optical transceivers and more advanced wavelength management components.

Single-fiber-bidirectional-transmission
 
 
 

 

 

 

Shenzhen Optico Communication Co., Ltd. is one of the leading dwdm device manufacturers and suppliers in China, featured by quality products and good service. Welcome to wholesale customized dwdm device form our factory. Also, free sample is available.

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