25G SFP28 LWDM Optical Transceiver

The 25G SFP28 LWDM optical module adopts LWDM (LAN WDM) fine wavelength division multiplexing technology (O-band), and has 12 wavelengths, eight of which are standard wavelengths that divide the spectrum of the O-band according to 800GHz, and the remaining four The wavelengths are the four wavelengths of the 25G CWDM optical module multiplexed, namely 1269.23nm, 1332.41nm, 1313.73nm and 1291.10nm. The wavelength interval is 4nm, which is much narrower than that of the 25G CWDM optical module, so a large wavelength shift will occur. Regarding the wavelength shift, there is another influencing factor. Under normal circumstances, the operating temperature of the SFP28 LWDM optical module is -40°C to 85°C, and the transmission distance is 10KM-40KM.

Like other 25G WDM optical modules, LWDM optical modules can also realize multi-channel signal transmission on one optical fiber, and its cost is lower, mainly in terms of its structural design. Compared with the SFP28 CWDM optical module, the wavelength of the SFP28 LWDM optical module is located in the low dispersion area, and only a PIN receiver can be used at the receiving end to meet the transmission requirements; compared with the SFP28 DWDM optical module, the SFP28 LWDM optical module does not have to use EML As for the laser, a relatively cheap DML laser can be used.

25G SFP28 MWDM Optical Transceiver

The 25G SFP28 MWDM optical module adopts MWDM (Metro WDM) medium wavelength division multiplexing technology. On the basis of using the first 6 waves of SFP28 CWDM, the center wavelength is shifted left and right by 3.5nm. DFB laser (with TEC) is used to realize 12 wavelengths. The luminous power range is 0-6dBm, the receiver sensitivity is -14dBm, the maximum power consumption is less than 2W, and the transmission distance is 10KM, which meets the requirements of industrial-grade scenarios.

It is worth mentioning that the SFP28 MWDM optical module combines the optical layer topping technology, realizes the OAM mechanism, and has functions such as remote optical path protection, communication fault location, and service performance detection, which can effectively improve the efficiency of network system management and operation. At the same time, there are two configuration options of APD and PIN receivers, which can meet the application requirements of users in the case of adding optical path protection switching or larger link segments.