If your school majors in optical fiber communications is relatively good, you can learn optical fiber communications, and in the future you can enter the Carrier Research Institute or ZTE, Huawei, FiberHome and other companies;
If it is relatively poor, You can study optical devices or lasers and join some companies that produce optical devices after graduation, such as many companies in Wuhan, Beijing Lingyun, Shenzhen Han's Laser, O-Net, Xinfeitong and other companies;
Optical design is relatively speaking The employment opportunities are wider. In addition to the above optical communication equipment manufacturers, many other industries will also have optical design needs, such as the LED industry, medical equipment, imaging equipment, etc.
Consider it based on your actual situation, I hope it will be helpful to you!