What are the categories of optical fibers? What are the differences among these categories? Which category does the storage device support?
Optical fibers fall into two categories: single-mode fibers (SMFs) and multi-mode fibers (MMFs).
Their differences are as follows:
MMFs provide sufficient space for the transmission of beams. The beams in different modes are transmitted at different speeds; therefore, the transmission distance of MMFs is limited. An MMF has a large core (diameter = 62.5 um or 50 um), allowing the concurrent transmission of beams in hundreds of modes. It also generates wide dispersion, and its operating wavelength is 850 nm or 1310 nm. Therefore, MMFs can be easily coupled with optical components.
SMFs only allow the transmission of beams with a fixed wavelength. Compared with MMFs, SMFs adopt a more stable lasing light emitter, and provide longer transmission distance. An SMF has a small core (diameter = 10 um), limiting the transmission of beams in only one mode. Its dispersion is narrow, transmission band is wide, and operating wavelength is long (length = 1310 nm or 1550 nm). Therefore, SMFs are difficult to couple with optical components.
Storage devices support only MMFs, and their peripherals must support MMFs as well.