TY - JOUR
T1 - Comparison between polarization-multiplexed DPSK and single-polarization DQPSK in 640 Gbaud, 1.28 Tbit/s-500 km single-channel transmission
AU - Tomiyama, Yutaro
AU - Harako, Koudai
AU - Guan, Pengyu
AU - Hirooka, Toshihiko
AU - Nakazawa, Masataka
PY - 2011/10
Y1 - 2011/10
N2 - We describe two schemes for 1.28 Tbit/s single-channel transmission at 640 Gbaud with polarization-multiplexed DPSK and single-polarization DQPSK, and compare their performance in a 500 km transmission. We found that the polarization multiplexing of ultrahigh-speed DPSK signals, for example at 640 Gbaud, is sensitive to the PMD characteristics of the transmission link. Even when first-order PMD is fully compensated, second-order PMD, which varies over a long period and is difficult to compensate, results in inter-polarization crosstalk induced by depolarization. The single-polarization transmission of a 640 Gbaud DQPSK signal is less vulnerable to PMD and therefore more stable, as the depolarized components induced by second-order PMD can be easily rejected with a polarizer. However, its performance is limited because the OSNR must be higher than for DPSK.
AB - We describe two schemes for 1.28 Tbit/s single-channel transmission at 640 Gbaud with polarization-multiplexed DPSK and single-polarization DQPSK, and compare their performance in a 500 km transmission. We found that the polarization multiplexing of ultrahigh-speed DPSK signals, for example at 640 Gbaud, is sensitive to the PMD characteristics of the transmission link. Even when first-order PMD is fully compensated, second-order PMD, which varies over a long period and is difficult to compensate, results in inter-polarization crosstalk induced by depolarization. The single-polarization transmission of a 640 Gbaud DQPSK signal is less vulnerable to PMD and therefore more stable, as the depolarized components induced by second-order PMD can be easily rejected with a polarizer. However, its performance is limited because the OSNR must be higher than for DPSK.
KW - Differential phase shift keying
KW - Differential quadrature phase shift keying
KW - High-speed optical pulse transmission
KW - Optical time division multiplexing
KW - Polarization multiplexing
KW - Polarization-mode dispersion
KW - Ultrashort optical pulse
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U2 - 10.1016/j.yofte.2011.07.007
DO - 10.1016/j.yofte.2011.07.007
M3 - Article
AN - SCOPUS:80255141836
SN - 1068-5200
VL - 17
SP - 439
EP - 444
JO - Optical Fiber Technology
JF - Optical Fiber Technology
IS - 5
ER -