As the increasing requirement of more bandwidth continues to grow, wireless service providers must find cost-effective and efficient methods to meet the bandwidth demand. Traditional transport networks are no longer capable of adequately serving today’s cell sites, newer technologies such as GPON, WDM-PON, and Ethernet over CWDM/DWDM are all suitable to cost-effectively address the growing bandwidth needs of wireless service providers. This passage is aimed to give you a brief introduction to CWDM.

CWDM is short for coarse wavelength division multiplexing, which is fairly generic originally and means a number of different things. In general, these things share the fact that the choice of channel spacings and frequency stability is such that erbium-doped fiber amplifier (EDFA) could not be utilized. One common meaning for CWDM refers to two (or possibly more) signals multiplexed onto a single fiber, where one signal is in the 1550nm band, and the other in the 1310nm band. CWDM is a convenient and cost-effective solution for the adoption of Gigabit Ethernet and Fibre Channel in campus, data-center, and metropolitan area access networks. Next, I will introduce you about some CWDM equipment.

CWDM Transceiver

An interesting and relatively recent development relating CWDM is the creation of GBIC and SFP transceivers utilizing standardized CWDM wavelengths. CWDM transceiver supports FC/APC, FC/UPC, SC/APC, SC/UPC, LC/UPC, LC/APC, etc. GBIC transceiver is larger than an SFP transceiver, the GBIC uses the larger "SC” style of connector while the SFP/SFP+ transceiver uses the smaller "LC” style of optical connector. Many times the optical patch cables will need to have different connector styles at each end, and example is having a SFP (LC connector) installed in a router connected to a SC port on a patch panel. The following picture present you a CWDM Transceiver.

CWDM MUX/DEMUX

Mux is short for multiplexer, yet Demux stands for deultiplexer. CWDM multiplexer is based on CWDM technology. It is a device to allow multiple optical signals at different wavelengths to pass through a single optical fiber strand. CWDM Optical MUX operates in the 1470nm to 1610nm range, which is usually passive device containing a very accurate prism to multiplex eight separate wavelengths of light along a single fiber pair. Passive devices can’t generate or repeat optical signals. The output signal of an optical multiplexer is referred to as a composite signal. At the receiving end, a demultiplexer separates all of the individual wavelengths of the composite signal out to individual fibers. Typically, mux and demux components are contained in a single enclosure. CWDM MUX/DEMUX is shown in the below picture.

1.CWDM MUX/DEMUX Types:

Duplex Bi-Directional CWDM MUX and DEMUXSimplex Bi-Directional CWDM MUX and DEMUXDuplex Directional CWDM MUX onlySimplex Directional CWDM DEMUX only

2.CWDM MUX/DEMUX Packaging:

A. 19'' 1RU Rack chassis or 23'' 1RU Rack chassis
B. LGX modules fit for 1RU Rack chassis or 4RU Rack Chassis
C. Field module type ABS boxD. Empty 1RU, 2RU Rack chassis and 4RU Rach Chassis on option

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