How to find out the character of a laser module?
We can find the information through reading its E-label, like:
SFP: The type of the module, now we have SFP and XFP.
1550nm: Working wavelength.
1.25Gb/s: Transmitting velocity
-4dbm-1dbm: Transmitting power range
21dbm: Laser power sensitivity
LC: interface type
40km: largest transmitting distance
Please check the attachment for more details for the laser modules