To compensate dispersion without using a variable-wavelength laser by providing a means which outputs a light, having a wavelength for optimum transmission characteristics with respect to the wavelength dispersion of an optical transmission line among lights outputted by light sources, to the optical transmission line.
Light sources 111 to 11n are provided which emit lights having different wavelengths λ1 to λn. When the wavelength (zero-dispersion wavelength) for optimum transmission characteristics with respect to the wavelength dispersion of the optical transmission line 30 is already known. Under the control of an output wavelength control part 13a, a light output part 12 outputs a light having the wavelength closest to the optimum wavelength from among the lights outputted by the light sources 111 to 11n to the optical transmission line 30. When the optimum wavelength is not known, then the light output part 12 outputs a specific light from among the light emitted by the light sources 111 to 11n sequentially to the optical transmission line 30 and varies the wavelength of the output light before the optical transmission system begins to operate. An output wavelength control part 13a recognizes the zero-dispersion wavelength from the wavelength of the light outputted to the optical transmission line 30 in the timing, where a specific frequency component has a minimum intensity.
| JP2838935 | LIGHT RECEIVER |
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| JP2917895 | [Title of Invention] Electronic device with optical communication function |
ISHIKAWA JOJI
OOI HIROMI
CHIKAMA TERUMI
Next Patent: OPTICAL TRANSMISSION SYSTEM