Optical transmitter and receiver

Abstract

Abstract PURPOSE:To eliminate the effects of the nonlinearity of a laser diode and the waveform distortion due to an optical fiber transmission line for an optical communication device, by mixing a high frequency signal into an input analog signal and averaging the amplitude value. CONSTITUTION:An analog signal A applied to an input terminal 1 is synthesized with a noise-like electric signal B given from a high frequency noise generating circuit 11 through a mixer 12. The optical intensity is modulated by an electric signal C obtained through the above-mentioned synthesization for a laser diode 3 which is biased by an optical signal transmitting circuit 2. The output light D of the diode 3 is transmitted by an optical fiber 4 and converted into an electric signal by a photodetector 5. This electric signal is amplified by a light receiving circuit 6, and an amplified electric signal F receives the separation of the noise- like electric signal component through a low band pass filter 13. Thus an analog signal G is reproduced at an output terminal 7.

Inventors

• 👤 Hiroshi Matsumura
• 👤 松村　弘志

Bibliographic Details