Nelson L E, Zhou X, Mac Suibhne N, Ellis A D, Magill P
AT&T Labs – Research, 200 South Laurel Avenue, Middletown, New Jersey 07748, USA.
Opt Express. 2011 May 23;19(11):10849-56. doi: 10.1364/OE.19.010849.
Polarization-switched quadrature phase-shift keying has been demonstrated experimentally at 40.5 Gb/s with a coherent receiver and digital signal processing. Compared to polarization-multiplexed QPSK at the same bit rate, its back-to-back sensitivity at 10(-3) bit-error-ratio shows 0.9dB improvement, and it tolerates about 1.6 dB higher launch power for 10 × 100 km, 50 GHz-spaced WDM transmission allowing 1 dB penalty in required optical-signal-to-noise ratio relative to back-to-back.
采用相干接收机和数字信号处理技术，已在实验中证明了偏振切换正交相移键控在40.5 Gb/s速率下的可行性。与相同比特率的偏振复用QPSK相比，其在误码率为10^(-3)时的背对背灵敏度提高了0.9 dB，并且在10×100 km、50 GHz间隔的波分复用传输中，它能够容忍高约1.6 dB的发射功率，相对于背对背情况，所需光信噪比有1 dB的代价。
