It is known that with the deployment of 4G LTE, the usage of terminal optical modules at 6G/10Gbit/s will increase. At the same time, as the data center rate increases, the 40G100Gbit/s module has gradually started mass production. . The optical isolators used in these optical modules will also increase the amount of adapters used. The adaptive isolator is developed for 4G LTE, data center 40G/100Gbit/s market, and is compatible with 6G/10Gbit/s point-to-point short-distance transmission network to adapt to the increasing terminal market. At present, most of the market uses isolators, and the adapters are sold separately. After the customer purchases, they are assembled into semi-finished products, and then flow into the next coupling welding process to produce the finished TOSA. The isolator is adapted to assemble and fix the isolator and the adapter, and the integrated product is sold to the customer. Reduce customer assembly time, reduce the type of stock preparation, and effectively reduce material and operating costs for customers.
The adapter is mainly used as a physical medium for optical fiber transmission. The internal optical fiber mainly carries the laser light from the laser and is coupled into the optical fiber and transmitted to the remote. External metal bearing and other accessories, such as laser welding. The main parameters of the overall adapter are: insertion loss, return loss, insertion force, etc.
                                    
2.6 Adaptation isolator specifications
1, insertion force 1-3N,
2, the insertion loss < 0.3dB,
3, return loss > 40dB (depending on the adapter angle)
4, isolation > 35dB
5, in line with ROHS
6, isolator center wavelength 1310nm, can be customized
7, isolators CA>0.6MM, can be customized
8, red dot connection is the polarization direction of the input light or customized
At present, the angle of the adapter in the isolator is available in three angles of 0, 6, and 8 degrees, which is analyzed from the perspective of customer application:
0 degree: high coupling efficiency, fast production efficiency, and weak anti-reflection ability
8 degrees: coupling efficiency is slightly lower, anti-reflection ability is strong
6 degree product performance between 0 degrees and 8 degrees