Compact IR-objectives for fiber-optic transmission and data processing systems

High-quality microobjectives that operate over a comparatively narrow or a comparatively broad range of the infrared wavelength band of 0.8-1.8 μm are widely used in a variety of optical communications and data processing devices and instruments that employ semiconductor radiators, photodetectors and optical fibers. These devices also include optical connectors, attenuators, modulators and optical channel switches, spectral multiplexers and demultiplexers, isolators, etc.. However, existing collimator-objectives do not correspond to the angular parameters of the converted radiation and are usually characterized by fairly considerable aberrations of all types over a significant infrared spectral range. This limits their applications to broadband optical signal transmission and processing systems. The `MOK-85' and `MOK-89' compact collimator-objectives developed at the `Dal'nyaya Svyaz' scientific production association have been specially designed for use in fiber-optic devices for matching volume optical elements and data processing devices to semiconductor radiators, single mode and multimode optical fibers and thin-film waveguides. These devices will be commercially manufactured in 1992.