The present invention provides a high-density and high-precision optical
fiber array which can stably be manufactured with excellent operability
and which can maintain excellent characteristics while suppressing
insertion loss with respect to optical parts by optimizing constituent
parts of the high-density optical fiber array. The present invention also
provides a manufacturing method of the optical fiber array. According to
the optical fiber array, a plurality of V-grooves are formed in a
V-groove substrate in parallel to each other. A plurality of optical
fibers whose end coatings are removed are aligned in the V-grooves. The
optical fibers are fixed, using an adhesive, between the V-groove
substrate and a lid plate to be placed on the optical fibers. In the
optical fiber array, an average value of pitches of the V-grooves is
substantially equal to an average value of outer diameters of the optical
fibers. A radius of curvature of fiber curl of each optical fiber is 8
meters or more.