Fiber-optic network system design

Optical system design generally follow these steps:

1 First is designed to be clear what kind of network, its current status, and why to use fiber.

2 is based on the actual situation to select the appropriate fiber-optic network equipment, fiber optic cable, patch cords and connecting with other items. Should be chosen to be used as a basis, and then based on performance, price, service, place of origin and brand to determine.

3 according to customer requirements and network types to determine the line of route, and draw the wiring diagram.

4 When you need a longer route accounting system attenuation margin, according to the following formula accounting:
Launched optical power attenuation margin = - Receiver Sensitivity - Line attenuation - connecting attenuation (dB) attenuation = cable length in which the line × unit attenuation; unit attenuation and fiber quality of a great relationship, usually single-mode for the 0.4 ~ 0.5dB/km; Multi-mode is 2 ~ 4dB/km. Attenuation, including splice connector to connect attenuation attenuation, splice attenuation and the quality of welding tools and personnel, generally melt is 0.01 ~ 0.3dB / point; cold fusion 0.1 ~ 0.3dB / point; connector attenuation and has a lot to the quality of joints, typically 1dB / point. System attenuation margin is generally less than 4dB.

5. Accounting failed, as the case may be to modify the design, and then accounting. This situation may sometimes be repeated several times.