We propose a hardware-efficient, low-cost integrated communication and vibration sensing method that relies solely on existing commercial coherent optical communication systems. The scheme utilizes dynamic frequency offset estimation to adapt to commercial 100kHz ECL, while employing sliding averaging and nearest-neighbor interpolation to greatly reduce algorithm complexity, making it conducive for integration into real-time platform. We demonstrate our scheme in a dual-polarization DSCM coherent optical communication system and discuss the performance in terms of communication and sensing capabilities under different conditions.
Circular polarization shift-keying (CPolSK) modulation maps binary digital signals to the two circular polarization states of the optical carrier, which can be applied to the modulation-demodulation of free space optical communication systems. This paper constructs a new optical communication system that uses vortex beams with different orbital angular momentum (OAM) modes as the optical carriers to multiplex CPolSK modulated signals. And with limited OAM modes, we combine amplitude shift-keying (ASK) modulation and CPolSK modulation to construct a modulation and demodulation system which is similar to quadrature amplitude modulation. In the receiver, a designed reference beam is used to interfere with the signal beam. Then the hybrid modulation signals can be easily converted into the intensity changes that can be directly detected for demodulation. The numerical simulation results show that this modulation system can effectively expand the communication capacity of CPolSK modulation system. And after combining ASK and CPolSK, the system can get better communication performance. It shows a wide prospect in the field of free space optical communication.
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