How much you know long-distance optical modules?
Optical modules are the most common photoelectric conversion devices. In the optical communication network, the transmission capacity is the most important parameter. Among them, the transmission distances of the optical modules are also different. In different fields and links of optical communication network transmission, the characteristics of optical modules are also different.
1. Transmission distance and application of long-distance modules
Transmission distance is one of the important factors of optical modules. Optical modules are also divided into short-distance optical modules, medium-distance optical modules & long-distance optical modules.
| Optical modules Type |
Link Lengths |
| Short-distance optical modules |
≤2KM |
| medium-distance optical modules |
10-20km |
| long-distance optical modules |
≥40KM |
Three factors for the distance of light transmission:
1) The transmitted optical power of the transmitter,
2) The receiving sensitivity of the receiving end
3) Light attenuation coefficient
Is the transmission distance of the optical module as far as possible?
-- Actually not. We need to take suitable solutions according to different needs. Long-distance optical modules are mainly used in metropolitan area network, optical synchronous digital transmission network, Ethernet, Fibre Channel, synchronous digital system, synchronous optical fiber network, telecommunications and other fields.
2. How many types of long-distance optical modules you know?
Long-distance optical modules in the optical module types of SFP, SFP+, SFP28, QSFP+ and QSFP28.
The common long-distance optical module specifications are 40km, 80KM, 120KM and so on.
3. Precautions for the use of long-distance optical modules
Since long-distance optical modules have strict requirements on the received optical power range, if the receiving sensitivity is exceeded, it is easy to damage the optical module. Therefore, we need to pay attention towhen using long-distance optical mode
(1) Test the optical power of the receiving end before connection.If the optical power is too strong, consider using an appropriate attenuator to meet the connection requirements.
(2) When a single-mode optical module with a transmission distance ≥ 10km is transmitting, the optical power at the receiving end cannot exceed the saturated optical power value.
(3) Long-distance optical modules can be used without attenuation in 10km link applications. Generally, modules longer than 40km need to be attenuated and cannot be directly connected, otherwise the transmitting and receiving components are easily damaged.
Long-distance optical modules solve the problem of long-distance transmission, provide users with great convenience, and are currently widely used.
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