In the field of optical communication, the packaging of optical devices plays a crucial role in the performance and application of optical modules. Selection 1: Packaging method and process: Hermetic packaging (TO-CAN, BOX, butterfly), non-hermetic packaging (COB, COC, etc. ) Selection 2: Optical chip types: VCSEL, DFB, EML, narrow linewidth tunable. The. ❑ Simulation of module plug board losses ❑ Module plug board construction options ❑ Summary. Recommend doubling low frequency corner frequency from current 50 kHz which require 0.