Application of C-Light DWDM/CWDM Optical Module in WDM Network

Posted on：September 1, 2024 by C-LIGHT

Wavelength Division Multiplexing (WDM) is a technology that simultaneously transmits multiple wavelengths of light in a single optical fiber，that doubles the capacity of optical fiber communication systems. With the rapid development of optical network bandwidth, this technology has a very important commercial application value. The most important DWDM in wavelength division network application in the foreseeable future, CWDM optical module products will have higher single-wave bandwidth (OFC in 2024 already has MARVELL, a cutting-edge technology company, BROADCOM Releases 800G C-BAND Long-distance Transmission Coherent Optical Module), with longer transmission distance (with the support of coherent technology and PAM technology, The effect of chromatic dispersion on the DWDM CWDM wavelength laser is reduced, enabling WDM transmission over longer distances),WDM optical module packaging continues to develop at a high speed in the direction of more miniaturization.

Figure 1. An application topology diagram of C-LIGHT DWDM CWDM optical module

Technical advantages of optical wavelength division network application

It can make full use of the bandwidth resources of optical fiber and save optical fiber resources. 

When using C-LIGHT's DWDM CWDM optical module to transmit WDM signals, the transmission capacity of one optical fiber is increased by dozens or hundreds of times compared with the gray light optical module to transmit single wavelength signals.

The existing passive wavelength division network system can be used to continuously upgrade bandwidth, saving the cost of new investment.

C-LIGHT's DWDM CWDM optical module covers a wide range of rates, from 400G 100G to 25G 10G 2.5G 1G. The product wavelength belongs to the C-BAND 100G/50GHz band, which can realize passive WDM optical network sharing.

It can support transparent transmission of multiple protocol signals simultaneously without interfering with each other. 

C-LIGHT DWDM CWDM optical module has the characteristics of supporting multiple rate protocols, such as OTU protocol, Ethernet x-BASE protocol, Fiber Channel FC protocol, etc.

Flexible networking

Using WDM routing technology, the network channels of the optical communication network can be adjusted without changing the optical cable facilities, which provides flexibility in the design of the communication network. For example, the 400G QSFP-DD adjustable DWDM optical module in Figure 2 is such an application in combination with ROADM.

Figure 2: 400G DWDM ZR+ and ROADM wavelength division multiplexing application

C-LIGHT DWDM CWDM optical module product technical advantages

●The product speed span is wide and the variety is complete.

From 400Gbps to 100Mbps, all are in production and delivery.

●The transmission distance is longer

For example, 25G DWDM breaks through the industry's 15km bottleneck and reaches up to 40km.

●More wavelength applications

For example, single-fiber bidirectional BiDi products that support tunable wavelengths and can produce customized wavelength combinations.

●More advantageous technologies

For example, most products support CDR function, and some products use the most advanced PAM technology.

●The cost advantage is obvious

C-LIGHT adopts both foreign and domestic chip solutions for the design and selection of core driver chips and lasers, providing more business options for different customers.

●Strong compatibility and versatility

After 15 years of development, C-LIGHT has obvious advantages in compatibility verification with major switching equipment around the world.

Examples of Partial C-light WDM Optical Modules

 DWDM optical module core test items:

MUX/DeMUX Passive System Fiber Measurement

Appendix: 400G DWDM coherent ZR+ optical module