Fig. 1. Experimental setup for suppressing intensity noise of single-longitudinal-mode DBR fiber laser with photoelectric feedback

Fig. 2. (a) Relative intensity noise (RIN) of laser in different pump power; (b) Frequency response characteristics of laser's pump transfer function

Fig. 3. (a) Frequency response characteristic of PI servo controller; (b) Frequency response characteristic of the first-order phase shift network

Fig. 4. Frequency response of the system open loop transfer function

Fig. 5. Relative intensity noise spectra of single-longitudinal-mode DBR fiber laser before and after suppression