Patent ID: 6690865
Filing Date: 2004-02-10
Classification: G02B

Abstract:
An alignment method of a laser diode chip for emitting laser light with an optical fiber for receiving the laser light comprising the steps of:facing the laser diode chip to a coupling end face of the optical fiber; aligning a position in a Z direction where the optical fiber is aligned with the laser diode chip at a position in a Z-axis direction of an optical axis of the laser light; and aligning a position in an XY direction where the optical fiber is aligned with the laser diode chip at a position of an X direction and a Y direction on an XY plane of an X-axis and a Y-axis orthogonal to the Z-axis, wherein the step of aligning a position in the Z direction has the steps of: acquiring light power data at a Z position where the coupling end face of the optical fiber is moved relatively with respect to the laser diode chip in the Z-axis direction to measure a light power received by the optical fiber and light power data is acquired at every predetermined reference distance of movement, in a state that the laser diode chip is faced to the coupling end face of the optical fiber; and determining an alignment position in the Z direction where the alignment position for the optical fiber in the Z-axis direction is determined with respect to the laser diode chip based on the light power data at every predetermined reference distance of movement, and wherein the reference distance of movement is an amount of integer multiples of (1/2)&lgr;, wherein a wavelength of laser light is set to &lgr;.