| 摘要 |
A device for coupling a light source and an optical detector to one end of an optical fiber employed for two-way transmission of information. So as to reduce the effect of parasitic radiation coming from the light source and reaching the detector, a second light source is used which is arranged in such a way that it likewise excites the detector and is modulated by a compensation signal. The compensation signal is derived from the information signal modulating the first light source and its phase and amplitude are controlled so as to compensate for the modulation of the parasitic radiation. This increases the transmission range and makes it possible to use the same radiation wavelength for the two transmission directions. |
