Abstract
In order to provide new services to the subscriber, some sophisticated system configurations based on a full fiber-optic access network such as Fiber-to-the-Home (FTTH)1) are required. In such systems, an optical network unit (ONU) working as a wavelength division multiplexing (WDM) transmitter/receiver module will become one of the key elements. To make the FTTH economically feasible, a low cost WDM module suitably designed for mass production has to be developed. Although several researches have been carried out in effort to achieve such cost-effective modules2,3), further investigations and new concepts are necessary to completely establish the optical subscriber network technology. This goal might be achieved with modules that properly combine different technologies. We introduce two of them: 1) dielectric multilayered filters, and 2) stacked planar optics4). With advances in thin-film technology, thin-film multilayered filters have been attracting significant interest for application to optical communication systems due to their high design flexibility and excellent optical performance. These filters can play a very important role in WDM modules. The stacked planar optics has been proposed to overcome the problem with alignment providing a passive alignment and simplification of both fabrication and assembly processes of optical devices. With this technology, it is also possible to realize very compact microoptics devices. Thus, low cost ONU modules suitable for mass production are expected.
© 1998 Optical Society of America
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