Patent ID: 7391953

Claim:
A capillary tube for holding an optical fiber which is adhered and fixed in a straight line to an optical component having a substantially rectangular cross-section perpendicular to an optical axis, which is formed at a position deviated from the center between the top-surface side end portion and the rear-surface side end portion of the exterior surface in the height-wise direction, and in which an insertion hole, into which the optical fiber is inserted and fixed, is formed at a position deviated from the center between the top-surface side end portion and the rear-surface side end portion of the exterior surface in the height-wise direction wherein the top-surface side end portion and the rear-surface side end portion of the exterior surface are formed to be positioned at a same level as a top surface and a rear surface of an exterior surface of the optical component in the height-wise direction, respectively, while the central axis of the insertion hole and the optical axis of the optical component are matched.