Francisco-J. RENERO-CARRILLO and Yoshiki ICHIOKA

Department of Applied Physics, Faculty of Engineering, Osaka University, 2-1, Yamada-oka, Osaka, 565 Japan

(Accepted September 29, 1994)

Use of an aspherical surface in the design of a lens system for one-to-many optical-interconnects (OTM-OI), composed of a doublet lens and a gradient-index (GRIN) lens array has been investigated. Applying the procedure of ALSIE (Automatic Lens design by Solving InEqualities), the off-axis lens systems, which feature the optical performance of the OTM-OI lens system, are optimized at 0.1 numerical aperture with a total field of view of 2°. Three aspherical designs with the aspherical surface for different surfaces are presented. The aspherical designs show preferable modulation transfer function (MTF) for high frequency as compared with the spherical design.

Key words : unconventional lens design, GRIN lens, optical interconnects