What are the common transmission rates of optical modules?
What are the important parameters of the optical module?
Working wavelength
1) 850nm (MM, multi-mode, low cost but short transmission distance, generally only 500M can be transmitted);
2) 1310nm (SM, single mode, large loss but small dispersion during transmission, generally used for transmission within 40KM);
3) 1550nm (SM, single-mode, small loss but large dispersion during transmission, generally used for long-distance transmission over 40KM, up to 120KM can be directly transmitted without relay);
4) CWDM (1270-1610 has a total of 18 bands at every 20nm interval);
5) DWDM (L-band and C-band) L-band from 1610.06~1564.68 every 0.8nm interval a total of 54 bands; C-band from 1563.86~1530.33 every 0.8nm interval a total of 45 bands;
Transmission rate Refers to the number of bits of data transmitted per second, in bps, currently commonly used: 155Mbps, 625Mbps, 1.25Gbps, 2.5Gbps, 10Gbps, 25Gbps, 40Gbps, 100Gbps, etc.
The transmission rate is generally backward compatible, so
In addition, in the optical storage system (SAN), its transmission rate is 2Gbps, 4Gbps and 8Gbps.
At present, 25G, 40G, and 100G have gradually become mainstream trends.
Transmission distance Refers to the distance that optical signals can be directly transmitted without repeater amplification. The unit is km. Optical modules generally have several specifications: multi-mode 550m, single-mode 10km, 20km, 40km, 80km and 120km, etc.
Transmitting power and receiving sensitivity are also important parameters of optical modules. When the receiving light of the optical module is lower than the receiving sensitivity, the optical module cannot completely receive the optical signal from the opposite segment, that is, packet loss occurs. Generally, the light receiving of an optical module is greater than its sensitivity by 3db, so a certain loss space is reserved for it, and it is not easy to lose packets.
Toputel Optical Transceiver series --> 10 Gigabit Ethernet SFP+ ; Gigabit Ethernet SFP; Fast Ethernet SFP, welcome your inquiry.
