Fig. 1. (a) Microscopic image of the fabricated FP-SA chip and (b) the box packaged FP-SA laser.

Fig. 2. (a) Power-current curves under different reverse voltages of the SA region. (b) Optical spectrum under the injection current of the gain region and the reverse voltage of the SA region of 140 mA and 0 V, respectively. (c) Optical spectrum under the injection current of the gain region and the reverse voltage of the SA region of 140 mA and −2.4 V, respectively.

Fig. 3. Experimental setup of the photonic RF filter. EDFA, erbium-doped fiber amplifier; PC, polarization controller; MZM, Mach-Zehnder modulator; SMF, single-mode fiber; PD, photodetector; VNA, vector network analyzer.

Fig. 4. Optical spectra of the shaped FA-SA laser corresponding to the tap weights of a sinc filter with different tap numbers.

Fig. 5. Measured RF transmission spectra of the sinc filter with different tap numbers.

Fig. 6. Optical spectra of the Gaussian-apodized sinc filter (σ, Gaussian factor).

Fig. 7. Measured RF transmission spectra of the Gaussian-apodized sinc filter.

Fig. 8. Measured RF transmission spectra of the center frequency-tunable Gaussian-apodized sinc filter.