| 摘要 |
To enable the filtering of a fight signal without using an optical bandpass filter, the present invention provides the following construction: a light signal transmitted through an optical fiber enters an injection-locked laser device 1; the injection-locked laser device 1 is locked to the wavelength of the light signal to oscillate synchronously with the light signal; the locked light signal enters a light frequency discriminator 2 to transform the frequency-modulated signal into an intensity modulated signal, and it enters a light receiver 3 to be demodulated. Since the injection-locked laser device 1 emits only an locked oscillation light, the received light signal can be extracted without using the optical bandpass filter. |
