| 摘要 |
For optical transmission systems of short lengths, particularly for optical waveguide transmission sections in the subscriber loop area it is proposed to operate the optical monomode waveguides, which are optimised for the wavelength range from 1300 to 1600 nm and standardised for long-range traffic, with optical transmitters (S) and receivers (E) the operating wavelength of which is distinctly below the cut-off wavelength of the optical waveguides and by ensuring by a suitable stable coupling of the laser (S) to the optical waveguide (1) that the monomode operation necessary for transmitting digital signals with high bit repetition rates is achieved. Such optical transmitters and optical receivers are already available at low cost so that the development efforts for reducing the costs of optical components adapted to the optimum transmission range of the optical waveguide (1), which are considered to be necessary in the literature, do not need to be undertaken. The attenuation of the optical waveguide, which is increased at 800 nm compared with the longer-wave range, can be accepted because of the relatively short length of subscriber lines. Bidirectional transmission in wavelength-division multiplex or in mode-division multiplex via a single optical waveguide (1) according to the principle of the invention is also possible. �<IMAGE>� |
