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Introduction to Coarse Wavelength Division Multiplexer Application

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2022-06-29


 The Coarse Wavelength Division Multiplexer (CWDM) is aimed at the access layer of the metropolitan area network. In principle, it is to use an optical multiplexer to multiplex optical signals of different wavelengths into a single optical fiber for transmission, and at the receiving end of the link, use an optical demultiplexer to decompose the mixed signals in the optical fiber into signals of different wavelengths , connect to the corresponding receiving device.

 

 CWDM equipment can be used to increase the transmission bandwidth and transmission distance of the network, which can rapidly increase the network capacity exponentially without affecting the original business, and at the same time greatly improve the security of the network. The industry-wide standard wavelength interval is 20nm, and each wavelength covers 1270~1610nm of the single-mode fiber system.

 

       CWDM devices

 The common CWDM is to connect multiple channels of CWDM devices one by one through the method of optical fiber cascade. As the number of channels cascaded increases, the size of the product package will gradually increase, and the channel insertion loss will also increase accordingly, affecting consistency.

       Compact Coarse Wavelength Division Multiplexer (CCWDM)

 CCWDM uses diaphragms of different channels to reflect light step by step, allowing the reflected light to travel along a "Z" shape, which is equivalent to "folding" the optical path and greatly increasing space utilization. At the same time, there is no cascade coupling between fibers, as long as the input and output collimators meet the corresponding matching conditions, the insertion loss value of each channel can be made very small, and the channel consistency is excellent.

 

       Appendix 1. Comparison of CCWDM and CWDM parameters

 

       Keywords: Metropolitan Area Network, Wavelength Division Multiplexing, CWDM, CCWDM, Optical Path Folding

 

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