Rate Category

Divided according to the rate of 155M / 622M / 1.25G / 2.125G / 4.25G / 8G / 10G, used more on the 155M and 1.25G market, 10G demand to increase positive attitude development.

Wavelength Classification

Divided by wavelength 850nm / 1310nm / 1550nm / 1490nm / 1530nm / 1610nm. SFP wavelength is 850nm multimode transmission distance of less 2KM; wavelength is 1310 / 1550nm single-mode transmission distance of over 2KM. Relatively speaking these three wavelengths cheaper price than the other three.

If the module does not identify it will be very confusing. Usually manufacturers will be in color tab distinction, such as: black pull ring is multimode, the wavelength is 850nm; blue is the wavelength of 1310nm module; yellow is the wavelength of 1550nm module; purple is the wavelength of 1490nm of modules.

Pattern Classification

1, multimode
Almost all of the multimode fiber dimensions are 50 / 125μm or 62.5 / 125μm, and the bandwidth (amount of information transmission fiber) is usually 200MHz to 2GHz. Multimode Optical multimode fiber can be up to five kilometers of transmission. Light-emitting diode or a laser as a light source. In vitro pull ring or color is black.

2, single-mode
Single-mode fiber size 9-10 / 125μm, and compared to multimode fiber having unlimited bandwidth and low loss characteristics. The single-mode optical transceiver used for long distance transmission, sometimes up to 150-200 km. Use LD or a narrow spectral line LED as a light source. In vitro pull ring or color is blue, yellow or purple.

3, differences and relations
Single-mode fiber cheap, but compared to similar single-mode device much more expensive multi-mode devices. Single-mode devices typically can run on a single-mode optical fiber can also be run on a multi-mode fiber, and multimode devices running only on multimode fiber.

10G module has gone from 300Pin, XENPAK, X2, XFP development, and ultimately with the same size and SFP 10G transmission signal, which is the SFP +. SFP With its compact and low cost advantages to meet the equipment needs of high-density optical modules, standard push from 2002 to 2010 has replaced 10G XFP become the market mainstream.