Kikuchi Kazuro, Osaki Masayuki
Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.
Opt Express. 2011 Dec 12;19(26):B32-9. doi: 10.1364/OE.19.000B32.
We demonstrate M-ary frequency-shift keying (FSK) optical modulation and digital coherent detection, aiming at applications to space communications, where high receiver sensitivity is the most crucial consideration. The proposed FSK transmitter and receiver are based on the coherent orthogonal frequency-division multiplexing (OFDM) technique and feature simple configuration and low computational complexity. By offline bit-error rate measurements using a 256-FSK signal without the forward error-correction code, we obtain the receiver sensitivity as high as 3.5 photons per bit at the bit-error rate of 10(-3). The experimental result is in good agreement with simulations.
我们展示了多进制频移键控（FSK）光调制和数字相干检测，目标是应用于空间通信，在空间通信中，高接收机灵敏度是最关键的考虑因素。所提出的FSK发射机和接收机基于相干正交频分复用（OFDM）技术，具有配置简单和计算复杂度低的特点。通过使用无前向纠错码的256-FSK信号进行离线误码率测量，我们在误码率为10（-3）时获得了高达每比特3.5个光子的接收机灵敏度。实验结果与仿真结果吻合良好。
