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publisherOhshima, Shigeru[Abstract] A new holographic optical element (HOE) for optical fiber communication systems has been investigated. The HOE is formed during irradiation light from an optical fiber and a laser diode (LD). An optical coupling system from an LD to a single mode fiber is composed without aligning the fiber. The cost of the LD module will be drastically reduced because there is no fiber alignment process. However, the optical coupling efficiency from the LD to the fiber using the HOE has never been calculated. We have shown the optical efficiency and its improvement method in this paper. It has been shown that the optical coupling efficiency can be improved by means of saturated exposure characteristics. Furthermore, how to improvement method has been also shown. We have found promising organic dyes for the HOE. The organic dyes have absorption spectra in the wavelength of 1.55 µm. It also checked that the organic dyes could be processed in the shape of a film