| 摘要 |
PURPOSE:To permit easy packaging while maintaining the low coupling loss of a semiconductor light emitting element and optical fiber by constituting an optical coupler of the semiconductor light emitting element, the 1st near parabolic rod lens of which the end face on the side facing said element has a convex curved face and the 2nd near parabolic rod lens. CONSTITUTION:The 1st near parabolic lens of which the end face on the side facing the semiconductor light emitting element 2 is formed to the convex curved face shape and of which the refractive index decreases in an approximately square distribution with respect to the distance from the central axis is disposed in proximity to a light emitting face 3 of said element 2. The 2nd near parabolic rod lens 7 is disposed in such a manner that the 1st end face faces the lens 6 and the 2nd end face 9 contacts with the end face of an optical fiber 10. The focusing parameter and refractive index on the central axis of the 1st lens 6 are made larger than said parameter and refractive index of the 2nd lens 7 and the pitch of the respective lenses is made <=0.25 pitch.
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