Fig. 1. Configuration of coherent communication using carrier recovery with injection locking

Fig. 2. Power spectral densities of laser. (a) Power spectral densities of laser at 5 GHz and 10 GHz with Manchester code modulation; (b) power spectral densities of laser with 5 GHz Manchester code modulation at different modulation depths

Fig. 3. Modulated optical spectrum and injection-locked spectrum

Fig. 4. Spectra of modulated light at modulation depths of 0.33 and 0.68

Fig. 5. Carrier recovery by injection locking technique at different modulation frequencies. (a) 3 GHz; (b) 4 GHz; (c) 5 GHz

Fig. 6. Carrier spectra recovered by injection-locked lasers at different injection optical powers

Fig. 7. Manchester code results at baud rate of 5 GHz based on injection locked carrier recovery technique at modulation depth of 0.42. (a) Signals acquired by oscilloscope; (b) comparison of demodulation result of BPSK modulated light with actual baseband signal

Fig. 8. Demodulation constellation diagrams of BPSK signals with different baud rates and modulation depths based on injection-locked carrier recovery. (a) Baud rate of 3 GHz, modulation depth of 0.33; (b) baud rate of 3 GHz, modulation depth of 0.42; (c) baud rate of 3 GHz, modulation depth of 0.49; (d) baud rate of 4 GHz, modulation depth of 0.33; (e) baud rate of 4 GHz, modulation depth of 0.42; (f) baud rate of 4 GHz, modulation depth of 0.49; (g) baud rate of 5 GHz, modulation depth of 0.33; (h) baud rate of 5 GHz, modulation depth of 0.42; (i) baud rate of 5 GHz, modulation depth of 0.49