1. Application scenarios
Determine the type of optical connector according to the application scenario, such as indoor, outdoor or special customization. Indoor optical connectors are used in non-exposed occasions. The connector size is small and suitable for dense arrangement, but the environmental resistance performance is relatively poor. Outdoor optical connectors are used in open-air occasions, such as rain, snow, sand, direct sunlight and other harsh environments. Special customized optical connectors are used in extremely special occasions, such as radiation resistance, deep sea sealing, nuclear explosion resistance, etc.

2. Functional division
The types of optical connectors are determined by function, such as device-level panel mounting, backplane blind mating, module-level panel mounting, optical rotary connectors, etc.
3. Determination of optical properties
The optical properties of optical connectors mainly include insertion loss and return loss. According to the optical characteristics of the link, select the connector indicators used by each node to ensure that the link loss meets the receiving sensitivity requirements of the optical module.