A lens adjustable laser diode package

A lens-adjustable method allowing correction of optical offaxial alignment to the correct axis position is proposed. The method is effective even after the lens is fixed. The lens-adjustable structure utilizes a special lens holder, a thin-walled pipe. The pipe is deformed plastically at its root and modified to achieve maximum fiber output power. This method is effective even if a 100-μm offaxial displacement initially exists. The holder was incorporated into a high-bit-rate optical isolator package, which allowed high-efficiency coupling. This package also shows good reliability