Fig. 1. Schematic of MPF structure

Fig. 2. Output optical spectrum of free-running F-P laser

Fig. 3. Principle diagram of MPF with single pass band. (a) Spectrum of free-running F-P laser; (b) spectrum under optical injection; (c) spectrum after EOM and before PD; (d) spectrum without direct modulation at SL; (e) spectrum with direct modulation at SL; (f) frequency response of system

Fig. 4. Diagram of experimental setup for achieving MPF with optical injection into F-P laser

Fig. 5. Measured (a) filter characteristic curve and (b) optical spectrum of MPF

Fig. 6. Measurement results of the center frequency and magnitude stability

Fig. 7. Frequency response and optical spectrum of MPF under different injection ratios

Fig. 8. Characteristics of MPF under different Δf. (a) Frequency response; (b) optical spectrum

Fig. 9. Frequency response of MPF under different Ib