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光电信息大讲堂第213期：低功耗高速通信电路与系统Low-Power and High-Speed Communications Circuits and Systems
物联网 无线电收发器 通信电路
2023/4/17
物联网的普遍应用依赖于以不断增长的速度高效地收集、交换和处理信息的能力。这对通信电路和系统的设计提出了巨大的挑战：在设备节点中，无线电通信需要同时实现低功耗、高性能和低成本；在核心数据网络（云）中，海量数据必须以超高吞吐量移动，要求信号链和时钟的高精度和保真度。为了应对这些挑战，本次报告讨论了用于物联网、医疗保健和生物医学应用的超低功率无线电收发器的几种创新架构和电路实现，以及高性能频率产生技术。...
High-speed Fading-free Direct Detection for DoubleSideband OFDM Signal via Block-wise Phase Switching
High-speed Fading-free Direct Detection Double Sideband OFDM Signal Block-wise Phase Switching
2014/11/6
We employ phase switching of either main-carrier or subcarriers of two consecutive signal blocks for double-sideband fading-free direct-detection (DD). In so doing, 40-Gb/s DDOOFDM is successfully rec...
Using simple intensity-modulation direct-detection systems, low-cost transceivers and easy-to-install 1-mm core diameter plastic fibers, recent activities on multigigabit baseband and ultra-wideband r...
Three-Dimensional Subcarrier-Multiplexed Nonbinary- LDPC-Coded Modulation Schemes Enabling Ultra High Speed Optical Communications
Fiber optics communications Modulation Low-density parity-check codes
2015/5/25
We propose nonbinary-LDPC-coded modulation schemes employing subcarrier-multiplexing and three-dimensional constellations. We improve coding gains of conventional PDM-M-QAM by 2.17dB and 2.92dB, for M...
First Experimental Demonstration of Nonbinary LDPC- Coded Modulation Suitable for High-Speed Optical Communications
Fiber optics and optical communications Modulation Low-density parity- check (LDPC) codes
2015/5/25
The first experimental demonstration of nonbinary-LDPC-coded optical transmission is presented. Using DQPSK, we can achieve >8dB and ~10dB net coding gains at the BER of 10 -6 in the absence and prese...
On the Reverse Concatenated Coded-Modulation for Ultra- High-Speed Optical Transport
Fiber optics optical communications Reverse concatenated FEC
2015/5/25
We propose reverse concatenated code with inner BCH code and outer LDPC code.BCH decoder is based on MAP-decoding that provides high-accuracy-reliabilities for suboptimum-LDPC-decoder, leading to perf...
Layered Decoding of Nonbinary LDPC Codes Suitable for High-Speed Optical Communications
Optical communications Forward error correction Low-density parity- check codes
2015/5/25
We propose using layered update rule in decoding nonbinary LDPC codes. Only 10-15 iterations suffice for good performance. Also, for the same BER performance, it increases throughput by twofold compar...
Over-Sampling based Burst-mode CDR Technology for High-speed TDM-PON Systems
Networks Optical communications
2015/5/22
We review recent progress of a over-sampling based burst-mode CDR as the key PMD device for supporting next-generation, 10Gbps capable TDM-PON systems. For the essence of circuit design, its burst-mod...
50 fJ-per-bit, High Speed, Directly Modulated Light Sources for On-chip Optical Data Communications
50 fJ-per-bit High Speed Directly Modulated Light Sources On-chip Optical Data Communications
2015/5/20
By employing optical injection-locking the direct modulation bandwidth of a 10μm diameter disc laser is increased to 15GHz. In addition, modulation at 20Gb/s is demonstrated with only 1mW DC bias & 19...
High Speed 4×12.5Gbps WDM Optical Wireless Communication Systems for Indoor Applications
WDM Optical Wireless Communication Systems Indoor Applications
2015/5/18
A novel high-speed optical wireless communication system incorporating WDM technology for indoor personal area networking applications is proposed and demonstrated. A 4×12.5Gbps mobile communication l...
A High-Speed Visible Light Indoor Network Employing a Short Pulse Modulation and a QPM-LN Module
High-Speed Visible Light Indoor Network Short Pulse Modulation QPM-LN Module
2015/5/18
We propose the concept of over-gigabit visible light indoor networks using λ-conversion achieved by combining a short pulse modulator with a QPM-LN module. Error free operation at 1.25 Gb/s is confirm...
Coded Multidimensional Pulse Amplitude Modulation for Ultra-high-speed Optical Transmission
Coded Multidimensional Pulse Amplitude Modulation ltra-high-speed Optical Transmission
2015/5/15
We propose a coded N-dimensional pulse-amplitude modulation (ND-PAM) suitable for ultra-high-speed serial optical transport. The polarization-multiplexed-ND-PAM significantly outperforms corresponding...
High-speed circuit technology for 10-Gb/s optical burst-mode transmission
Network Optical communications
2015/6/11
A careful choice of burst-mode 3R receiver circuits achieves fast settling of 200 ns and low power of 1.68 W as well as the optical sensitivity and dynamic range in the 10G-EPON specification.
Implementation of High-speed Buffer Management for Asynchronous Variable-length Optical Packet Switch
Networks Optical communications
2015/6/10
We develop an FPGA-based buffer management hardware with 8 input ports, which implements a parallel and pipeline mechanism to support over-200-Mpacket/s/port asynchronous variable-length optical packe...
Adaptive Pulse Shaping for High-Speed Optical Communications
Pulse shaping Optical communications
2015/6/9
Through temporal pulse shaping at a repetition rate of 42.7 GHz, this paper demonstrates a simple method with applications in high-speed optical communications for adaptive, multi-type pulse shaping, ...