Investigation of homodyne demodulation of RZ-BPSK signal based on an optical Costas loop

Haijun Zhou; Zunzhen Zhu; Weilin Xie; Yi Dong

doi:10.1117/12.2295534

10 January 2018 Investigation of homodyne demodulation of RZ-BPSK signal based on an optical Costas loop

Haijun Zhou, Zunzhen Zhu, Weilin Xie, Yi Dong

Proceedings Volume 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing; 106170F (2018) https://doi.org/10.1117/12.2295534
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

We demonstrate the coherent detection of 10 Gb/s return-to-zero (RZ) binary phase-shift keying (BPSK) signal based on a homodyne Costas optical phase-locked loop (OPLL). It demonstrates time misalignment tolerance of +/- 10% of the transmitted RZ-BPSK signal, i.e. -20 to +20 ps between the pulse carver and the phase modulator for 5 Gb/s RZ-BPSK signal, -10 to +10 ps or 10 Gb/s RZ-BPSK signal. Besides, the Costas coherent receiver shows a 2.5 dB sensitivity improvement over conventional 5 Gb/s NRZ-BPSK and a 1.4 dB over 10 Gb/s NRZ-BPSK only at the cost of slightly higher residual phase error. Those merits of sufficient tolerance to misalignment, higher receiver sensitivity, and low residual phase error of RZ-BPSK modulation are beneficial to be applied in free space optical (FSO) communication to achieve higher link budget, longer transmission distance.

Citation Download Citation

Haijun Zhou, Zunzhen Zhu, Weilin Xie, and Yi Dong "Investigation of homodyne demodulation of RZ-BPSK signal based on an optical Costas loop", Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 106170F (10 January 2018); https://doi.org/10.1117/12.2295534

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