GBIC classification is based on its working wavelength, data transmitting rate, working power, and working distance. Generally GBIC fiber optic end the interface is SC type, the laser unit in GBIC module can be 850nm VCSEL, 1310nm FP, 1310nm DFB, and 1550nm DFB. Ingellen provides GBIC transceiver modules, including WS-G5483,WS-G5484,WS-G5486,WS-G5487 and CWDM GBIC. These modules are with 850nm, 1310nm, 1550nm wavelength, SFP 1.25Gb/s, 1.0625Gbps data rate, working distance from 300 meters to 80 kilo meters. But how much do you know about CWDM GBIC module?The CWDM GBIC module, works at 1.25Gbps full duplex mode, help companies and service providers to set up scalable and easy to deploy Gigabit Ethernet and Fiber Channel service in the networks. The CWDM GBIC modules are plug and play and very simple to use, which do not require configuration. The CWDM GBIC are used in fiber optic network according to IEEE 802.3z standard, it could be plugged into the GBIC ports or slots of router or switch for linking.18 HP SFP wavelengths laser and PIN photodetector for 80km transmission; Therefore, we can configure more than double the number of ports for a passing fancy penal. The other function of SFP fiber optical module is in conform with GBIC optical module basically. So, some switch manufacturers said that the sfp module is the mini GBIC component.In short, the actual of SFP optical module is half of GBIC optical module and can be put together more than double the number of component interfaces. And the program of SFP is LC, GBIC is SC program generally.