A low-cost bright image-pick up lens of a small size is provided which is short in total length, wherein the angle of field is beyond 30; the angle of incidence onto the image pickup device is narrowed; and various aberrations are appropriately corrected. The image-pick up lens comprises, from the side of an object, an aperture stop, a biconvex positive lens, and a meniscus lens having a concave surface on the object side, and each of the lenses includes at least one aspheric surface.

 
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< Preform for an optical lens, an optical lens, and a method of manufacturing an optical lens

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> Optical transmitter including a linear semiconductor optical amplifier

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