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Reports on Japanese researchers' development of a nonlinear system called optical fountain that concentrates light beyond the linear limit. Capture of light by quantum dots; Multistage concentration of light.

Features TOMBO, a large camera with small optics, developed by researchers in Osaka, Japan. Commercial potentialities; Various applications; Advantages of the technology.

The article evaluates optical-frequency counter which integrates a frequency-stabilized light source, optical-comb generator and optical-frequency meter from Optical Comb Institute of Tokyo, Japan.

Discusses the use of a silicon diffractive optical element by engineers at the R&D Center of Oki Electric Industry Co. of Tokyo, Japan. Control of optical wavefronts through a clever design of diffractive optics; Solution to the cost and optical-power losses that come from collimating light through aspherical lenses; Failure of the technology to meet performance demands or market acceptance; Selection of a silicon diffractive element for high diffraction efficiency.

Discusses the optical signal transmission technique used in Japan. Division of data in units called packets in communications like the Internet; Use of optics in transfer of information in networks; Experiment conducted on optical code-division multiple access technology; Details on the experiment.