Dynamic range of semiconductor laser in the presence of external cavity

This paper presents experimental observations of dynamic range of a laser diode in the presence of external optical feedback. The external cavity provides an efficient frequency response over a narrow band for high frequency carrier signals, while reducing the relative intensity noise for data signals away from the natural resonant frequency. The experimental results show that the spurious free dynamic range can be improved at least by 8 dB using optical feedback over a broad bandwidth. This technique can be used to simultaneously transmit high quality data signals as well as high frequency carrier signals.<>