TY - GEN
T1 - Phase noise insensitive multilevel POLSK based on QAM mapping in coherent optical systems
AU - Uehara, Hideyuki
AU - Seto, Ichiro
AU - Ohtsuki, Tomoaki
AU - Sasase, Iwao
AU - Mori, Shinsaku
N1 - Publisher Copyright:
© 1992 IEEE.
PY - 1992
Y1 - 1992
N2 - We propose a new multilevel POLSK (Polarization-Shift-Keying) coherent optical system based on QAM (quadrature-amplitude-modulation) mapping. In the designing high-spectral efficiency systems, problems concern the utilization of the single-channel bandwidth, which is determined mainly by the receiver bandwidth. One way to increase the single-channel transmission rate is multilevel transmission, however due to the laser phase noise, it is difficult for conventional modulation schemes such as PSK and QAM to realize coherent optical multilevel transmission systems. The proposed system, which is based on the exploitation of the property of POLSK, can cancel the laser phase noise. Therefore, this system makes multilevel transmission possible in coherent optical communication. We theoretically analyze the receiver sensitivity of the proposed system compared with conventional M-PSK and M-QAM systems and evaluate the effect of the fluctuation of the state of polarization (SOP) on the receiver sensitivity of the proposed system. It is found that the proposed system is more efficient in utilizing the optical single-channel bandwidth and has good receiver sensitivity when increasing transmission rate, compared with conventional M-PSK and M-QAM heterodyne system with existence of phase noise.
AB - We propose a new multilevel POLSK (Polarization-Shift-Keying) coherent optical system based on QAM (quadrature-amplitude-modulation) mapping. In the designing high-spectral efficiency systems, problems concern the utilization of the single-channel bandwidth, which is determined mainly by the receiver bandwidth. One way to increase the single-channel transmission rate is multilevel transmission, however due to the laser phase noise, it is difficult for conventional modulation schemes such as PSK and QAM to realize coherent optical multilevel transmission systems. The proposed system, which is based on the exploitation of the property of POLSK, can cancel the laser phase noise. Therefore, this system makes multilevel transmission possible in coherent optical communication. We theoretically analyze the receiver sensitivity of the proposed system compared with conventional M-PSK and M-QAM systems and evaluate the effect of the fluctuation of the state of polarization (SOP) on the receiver sensitivity of the proposed system. It is found that the proposed system is more efficient in utilizing the optical single-channel bandwidth and has good receiver sensitivity when increasing transmission rate, compared with conventional M-PSK and M-QAM heterodyne system with existence of phase noise.
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U2 - 10.1109/ICCS.1992.255103
DO - 10.1109/ICCS.1992.255103
M3 - Conference contribution
AN - SCOPUS:77951547014
T3 - Proceedings - Singapore ICCS/ISITA 1992: ''Communications on the Move''
SP - 1043
EP - 1047
BT - Proceedings - Singapore ICCS/ISITA 1992
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 1992 Singapore: Communications on the Move, ICCS/ISITA 1992
Y2 - 16 November 1992 through 20 November 1992
ER -