There may only be two truly independent manufacturers in China
These two have patents
and are the best in China
One is AVIC Optoelectronics Technology Co., Ltd. (listed company) in Luoyang, which is relatively expensive and cannot be afforded by ordinary companies. State-owned or listed companies are almost the same
The other is Shanghai Fangao Communication Technology Co., Ltd. Their company also launched an ODC 2.5 connector, which is said to be more stable and reliable than the original ODC. It is understood that this company has strong independent research and development capabilities and can customize many special connectors according to customer requirements
Most of the others are trading companies, not physical enterprise manufacturers, and are in the nature of buying and selling