Fig. 1. Experimental setup for measurement of relationship between locking range and injection ratio

Fig. 2. Locking range versus injection ratio

Fig. 3. Optical spectra of master laser and slave laser with injection locking and free running. (a) Wide-linewidth slave laser; (b) narrow-linewidth slave laser

Fig. 4. Coherent OFDM-PON system based on OFC and injection locking local laser

Fig. 5. Polarization control schemes in injection locking. (a) Self-feedback polarization tracker scheme; (b) polarization independent module scheme

Fig. 6. Schematic of I/Q modulator

Fig. 7. Modulation characteristics of I/Q modulator

Fig. 8. Frequency distribution of the composite triple beat number

Fig. 9. Schematic of polarization diversity coherent optical detection module

Fig. 10. Power spectrum of intermediate carrier and OFDM lower sub-band signal

Fig. 11. Schematic of down conversion system

Fig. 12. Power spectrum of intermediate carrier

Fig. 13. Power spectrum of base band OFDM signal

Fig. 14. BER performance versus OFDM signal power

Fig. 15. BER performance versus LO power

Fig. 16. BER performance versus injection ratio

Fig. 17. BER performance versus received optical power of different systems