A transmitter (110) of an optical polarization division multiplexed, PDM, signal is described; wherein the PDM signal comprises a first signal component (810) in a first optical polarization plane and a second signal component (820) in a second optical polarization plane; the transmitter (110)...
In this paper long-haul, single channel, polarization multiplexed 16-state quadrature amplitude modulation (PDM-QAM-16) transmission at 112 Gbit/s is investigated. Novel digital signal processing techniques are used to perform carrier phase estimation and symbol estimation, in combination with nonlinear...
本发明属于光载无线通信技术领域,具体为一种基于偏振复用光调制器产生PDM‑m2QAM射频信号的光纤‑无线通信系统。本发明系统的发射端包括:激光器、偏振复用强度调制器、本地振荡器、倍频器、功分器、任意波形发生器、I/Q混频器、偏振分束器、光电探测器、发射天线;接收端包括:接收天线、模数转换器、后端DSP模块;...
We proposed and experimentally demonstrated a general pilot structure for probabilistic shaped (PS)-polarization division multiplexing (PDM) M-ary quadrature amplitude modulation (MQAM) coherent optical transmission, where a portion of PS-MQAM symbols is exploited as the pilot symbols with the same ...
Coherent Detection Generation of 88 Gb/s PDM-16-QAM Using Two Conventional I/Q Modulator and Coherent DetectionGeneration of 88 Gb/s PDM-16-QAM Using Two Conventional I/Q Modulator and Coherent DetectionPatel Nikita PrahaladbhaiRohit B. Patel...
The formulation of the posterior probability is theoretically analyzed, and the way to reduce the pre-decoding bit error rate (BER) of the low density parity check (LDPC) decoder for PDM-8QAM constellations is presented. Simulation results show that it outperforms the traditional scheme, i.e....
Figure 4. Internal structures of PDM-256-QAM transmitter and OSC loop control. A symbol rate of 20 Gsymbols per second is achieved using 8 bits per symbol in the QAM, making it 256-QAM. The M-ary pulse generator provides m number of different levels to different 8 bits per symbol and...
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(2)二次函数的图象经过点D、M、A,其对称轴上有一动点P,连接PD、PM,求△PDM的周长最小时点P的坐标;(3)在(2)的条件下,当△PDM的周长最小时,抛物线上是否存在点Q,使S△QAM= 1 6S△PDM?若存在,求出点Q的坐标;若不存在,请说明理由.试题答案 在线课程 分析:(1)连接CM,可以得出CM=OM,就有∠MOC=∠...
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