divergence angle when the light beam reaches the cylindrical lens if the radiation angle increases about three times e g 45 u00b0 due to a refractive index difference between the substrate 10 and an air on the surface the width of the sagital ray is became same as that of tangential ray after traveling 25 u03bcm away from microlens normal to the substrate in the above mentioned location by placing the cylindrical microlens 42 with its cylindrical axis perpendicular to that of microlens 41 the sagital ray is collimated too as a result a symmetrical type of light beam is formed and the symmetrical type of light beam is focused by grin lens 43 into the optical fiber referring to fig4 b a cylindrical microlens is fabricated on one side of the grin graded refractive index lens 45 to simplify an optical system and an arrangement in the second optical system by using the oval microlens instead of the cylindrical microlens 42 the light beam on the axis with small radiation angle decreases the radiation angle to provide mobility in the position of the lens and increases allowed tolerance in the axis direction eventually those lenses can be replaced with one microlens finally the laser integrated with the cylindrical microlens.